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data book w83c553f system i/o controller with pci arbiter a company publication number : 2565; version a.7.0d

copyright notice copyright 1995, 1996, 1997 winbond systems laboratory. all rights reserved. issued: september 27, 1995 publication no: 2565; ver. a.6 issued: october 1, 1996 publication no: 2565; ver. a.6.2 issued: march 1, 1997 publication no: 2565; ver. a.7.0b issued: september 1, 1997 publication no: 2565; ver.a.7.0c issued: february 22, 1998 publication no. 2565; ver.a.7.0d disclaimer this document contains information on a product under development at winbond systems laboratory. the information is intended to help you to evaluate this product. winbond systems laboratory reserves the right to change or discontinue work on this proposed product without notice. winbond systems laboratory makes no warranty for the use of its products and bears no responsibility for any errors which appear in this document. specifications are subject to change without notice. trademarks the company and product names mentioned in this document may be the trademarks or registered trademarks of their manufacturers. winbond systems laboratory 27 27 n. first street, san jose, ca 95134 phone: (408) 526-9162 fax: (408) 474-1699
w83c553f table of contents winbond systems laboratory 1 preface this document describes the function and use of the winbond systems laboratory w83c553f system i/o (sio) controller with pci arbiter. it provides all of the information necessary for design engineers to incorporate the device into notebook and desktop computer systems. organization of the manual the information in this document is organized into the following seven chapters: chapter 1 general information this consists of an overview discussion of the product and its features. included are the stylistic conventions used in this manual . chapter 2 pin descriptions provides pin-out diagrams and pin descriptions. chapter 3 system architecture discusses the design of the device and the implementation of the device's features. chapter 4 register information describes the software control of the chip set's various functions. chapter 5 electrical specifications provides the operating specifications for the device. chapter 6 timing diagrams provides timing diagrams and tables of timing values. chapter 7 mechanical description shows the critical dimensions of the device. chapter 8 thermal information shows the temperature calculation of the device. appendix a i/o driver characteristics
w83c553f table of contents winbond systems laboratory 2
w83c553f table of contents winbond systems laboratory 3 table of contents preface ................................ ................................ ................................ ................................ ............... 1 1.0 general information ................................ ................................ ................................ ... 5 1.1 features ................................ ................................ ................................ .................... 5 1.2 general description ................................ ................................ ................................ ... 7 1.3 stylistic conventions used in this manual ................................ ................................ .. 9 2.0 pin descriptions ................................ ................................ ................................ ................... 1 0 2.1 pin assignments ................................ ................................ ................................ ........ 10 2.2 pin description ................................ ................................ ................................ ........... 13 3.0 system architecture ................................ ................................ ................................ ............. 28 3.1 overview ................................ ................................ ................................ .................... 28 3.2 active state ................................ ................................ ................................ ............... 29 3.3 bus structures ................................ ................................ ................................ ........... 30 3.4 pci-to-isa bridge ................................ ................................ ................................ ...... 31 3.5 pci bus cycles ................................ ................................ ................................ .......... 31 3.6 pci i/o read cycle ................................ ................................ ................................ .... 34 3.7 pci i/o write cycle ................................ ................................ ................................ .... 35 3.8 pci configuration r ead cycle ................................ ................................ .................... 36 3.9 pci configuration write cycle ................................ ................................ .................... 37 3.10 pci memory read ................................ ................................ ................................ ..... 38 3.11 pci memory write ................................ ................................ ................................ ...... 39 3.12 pci memory read line ................................ ................................ .............................. 40 3.13 pci memory write and invalidate ................................ ................................ ............... 40 3.14 transaction termination ................................ ................................ ............................. 41 3.14.1 pci disconnect with data transfer timing ................................ ................. 41 3.14.2 pci disconnect without data transfer timing ................................ ............ 42 3.14.3 pci target abort timing ................................ ................................ ............. 43 3.14.4 pci preemption timing ................................ ................................ .............. 44 3.14.5 pci master abort timing ................................ ................................ ............ 45 3.15 ide interface operation ................................ ................................ .............................. 46 3.16 pio transfers ................................ ................................ ................................ ............ 47 3.17 32-bit data transfers ................................ ................................ ................................ . 48 3.18 bus master transfe rs ................................ ................................ ................................ . 49 3.19 82c59a interrupt controller ................................ ................................ ........................ 49 3.20 82c37a dma controller ................................ ................................ ............................. 49 3.21 82c54 counter/timer ................................ ................................ ................................ . 50 3.22 pci arbiter ................................ ................................ ................................ ................. 50 3.23 break events ................................ ................................ ................................ ............. 51 3.24 cpu modes (x86 or powerpc) ................................ ................................ .................. 51 4.0 register information ................................ ................................ ................................ ............. 52 4.1 pci configuration space - isa bridge registers ( function 0) ................................ ..... 54 4.1.1 function 0 header registers ................................ ................................ ...... 54 4.1.2 function 0 control registers ................................ ................................ ...... 58 4.2 isa bridge (function 0) i/o registers ................................ ................................ ......... 78 4.2.1 dma controller i/o registers ................................ ................................ ..... 78 4.2.2 programmable interrupt controller (pic) registers ................................ ..... 93 4.2.3 counter/timer i/o registers ................................ ................................ ....... 101 4.2.4 miscellaneous i/o control registers ................................ ........................... 105 4.3 pci configuration space - bus master ide registers (function 1) ............................ 109 4.3.1 function 1 header registers ................................ ................................ ............. 111
w83c553f table of contents winbond systems laboratory 4 4.3.2 function 1 control registers ................................ ................................ ...... 123 4.4 bus master ide (function 1) i/o registers ................................ ................................ . 1 29 4.4.1 primary/secondary command registers ................................ .................... 13 0 4.4.2 primary/secondary status registers ................................ .......................... 13 1 4.4.3 primary/secondary prd table ................................ ................................ ... 13 2 5.0 electrical specifications ................................ ................................ ................................ ....... 13 3 6.0 timing diagrams ................................ ................................ ................................ .................. 13 5 6.1 pci timing diagrams ................................ ................................ ................................ . 13 6 6.2 ide/ata data transfers ................................ ................................ ............................. 14 2 6.3 isa bus timing ................................ ................................ ................................ .......... 15 0 7.0 mechanical description ................................ ................................ ................................ ........ 15 3 8.0 thermal information ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? . ? ? ? ? ? ? . ? ? ? ? ? ..154 9.0 appendix a ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? . ? ? ? ? ? ? ? ? ..155
w83c553f general informat ion winbond systems laboratory 5 1.0 general informa tion 1.1 features high integration pci-isa solution ? optimized for lowest system cost ? complies with pci revision 2.0 specification ? universal pci device supporting x86 and powerpc (non-x86) modes of operation nand tree on most signal pins to facilitate board level testing in pcb manufacturing environment integrated pci bus master ide controller ? dual channel bus master ide for up to 4 peripherals, including hard drives, atapi (ide) cd-roms, tapes, etc. ? multi-threading capability allows two simultaneous i/o processes ? independent ide timing registers allow fast/slow devices on the same cable ? two independent dma channels for bus master scatter/gather dma transfers across the pci bus ? large 64 b yte dma fifo for zero wait state pci burst transfers ? support for multiword dma mode 1 (13.3 mb/s), mode 2 (16.6 mb/s) ide drives ? pio ide support for modes 0-4 disks ? edge rate controlled outputs directly drive ide headers ? four byte pre-fetch and po sted write buffers ? dma channels can be re-configured for p-n-p motherboard devices ? software and register set compatible with intel bus master pci-ide specification (sff 8038i) ? supported by existing device drivers for ms-dos, windows, nt 3.1, nt 3.5x, nt4.0, os/2 2.1, os/2 warp, netware 3.12 and 4.x** ? recompiled powerpc device drivers also available pci arbiter ? supports cpu, ide, isa and five additional bus masters ? programmable access windows allow fine tuning of pci access for each bus master ? can be disabled on power-up via strapped pin ** os/2, novell driver by dtc
w83c553f general informat ion winbond systems laboratory 6 power management break event support for green pc applications built-in integrated peripheral controller (ipc) with standard pc-at peripherals ? two 82c37a dma controller s (types a, b, and f) - 32-bit addressing allows use of alternate cpus, such as powerpc - supports multiple 8-bit and 16-bit scatter/gather dma channels ? two 82c59a interrupt controllers - all irq inputs may be programmed for edge or level sensitivity ? one 82c54 counter/timer ? routes external pci interrupts to a software-selectable interrupt channel pci bus interface ? pci revision 2.1 compliant ? pci clock frequencies up to 33 mhz at 5v ? supports delayed completion for isa cycles ? active address decoding for internal i/o devices ? subtractive decoding for isa bridge, kbc and rtc ? supports disconnection (with retry) for slow internal accesses to improve latency ? short pci bus ownership when mastering to minimize overall system latency ? fast dma transfers from i/o devices to pci agents as a master ? separate request and grant signals for isa dma and ide controllers isa bus bridge ? four byte line buffer prevents isa masters from "hogging" pci bus ? full implementation of a standard isa bus ? sepa rate isa and ide data buses reduce noise and increase system performance ? synchronous pci-to-isa interface with direct drive for 5 isa slots xd-bus interface ? support for bios rom or powerpc systems boot rom ? support for flash eprom ? provides keyboard controller connections ? provides real-time clock connections ? provides data buffer control miscellaneous ? port b support ? port 92 support uses 0.6 um , ultra-low power cmos technology for rev. e and below ; 0.5um for rev. g. packaged in a 208-pin pqfp package
w83c553f general informat ion winbond systems laboratory 7 1.2 general description the w83c553f enhanced system i/o (sio) controller with pci arbiter is a highly integrated device intended for use in any peripheral component interconnect (pci) system, supporting x86 or powerpc (non-x86) type microprocessors. it supports all pci 2.1 compliant cpu bridge implementations and directly interfaces with pci and isa industry standard buses, including two direct drive ide channels supporting up to four peripherals. the w83c553f is a universal pci device which can be used with many cpu-to-pci bridge solution. the w83c553f includes 32-bit isa dma addressing (rather than 24-bit) to simplify its use in systems using re-compiled versions of 32-bit operating systems (such as windows nt running on powerpc, alpha, or other risc cpu). the peripheral controller integrated into the w83c553f includes two enhanced seven channel 82c37a 32-bit dma controllers that support fast dma transfers with a four byte line buffer to isolate the pci bus from the isa bus, enhancing performance. both dma controllers support scatter/gather data transfer capability. the w83c553f enhanced sio controller provides the bridge between the pci bus and the isa expansion bus. it also integrates a pci bus master ide controller, an eight master pci arbiter (which may be disabled if desired) and many of the common i/o functions found in today's isa based pc systems. the w83c553f incorporates the logic for a complete pci interface (master and slave) and isa interface (master and slave). also included is pci and isa arbitration, 14 level interrupt controller, a 16-bit bios timer, three programmable counter/timers, non- maskable-interrupt (nmi) control logic and register support for power management break events. the built-in enhanced pci ide controller is a highly integrated dual port controller, providing a high performance data path between ide devices and the pci bus. four ide chip select signals provide accessing of up to four devices. each device has its own programmable registers for selecting 16-bit and 32-bit data pipelined transfer rates, read-ahead and posted writes. a large 64 byte dma fifo buffers data to and from the ide disks enabling the integrated scatter/gather dma controller to efficiently perform zero wait state burst transfers across the pci bus when enough data is available in the fifo. bus master ide significantly improves the overall system performance of a multi-master pci configuration by greatly reducing the bus and cpu utilization required for the disk and cd-rom interface. burst data transfers at 33 mhz can be sustained at 132 mb/s on the pci bus. the integrated bus-mastering pci-ide core is the original sonata w83789f core with some modification of interrupt routing. this controller is fully compliant to intel's bus-mastering controller and sff8038i specifications. bios support has been incorporated in all the leading bios companies' software. driver software, previously tested and qualified for the w83789f, is available from winbond systems laboratory for all major operating systems, including recompiled powerpc versions.
w83c553f general informat ion winbond systems laboratory 8 figure 1-1. w83c553f enhanced system i/o controller block diagram
w83c553f general informat ion winbond systems laboratory 9 1.3 stylistic conventions used in this manual the following stylistic conventions have been used throughout this manual: ? signal names : signals that are active at a low voltage level are indicated by a pound sign (#) after the signal name. signal names not followed by the # are active at the high voltage level. ? least significant bits in words and words within memory spaces begin with zero (0). when a range is given, the most significant bit is shown to the left and the least significant bit is shown to the right. for example, ad[31:0]. ? hexadecimal numbers are given with the number in upper case followed by a lower case 'h'. for example, ? 8affh ? .
w83c553f pin descriptions winbond systems laboratory 10 2.0 pin description s this chapter shows the pin diagrams, pins listed by pin number, device logic symbols, and describes each pin signal for the w83c553f. 2.1 pin assignments figure 2-1. pin assignments for the w83c553f
w83c553f pin descriptions winbond systems laboratory 11 table 2-1. w83c553f pins listed by pin number 1 drq7 2 pwrgd 3 init 4 ignne#/hreset# 5 pmact#/isarst 6 gnt4#/flshreq# 7 req4#/flshack# 8 pwrpc/x86#/cpugnt# 9 cpureq# 10 int 11 nmi 12 ferr#/irq13 13 pci5th#/gnt3# 14 vdd 15 req3# 16 arbdis#/gnt2# 17 req2# 18 intd# 19 intc# 20 intb# 21 inta# 22 a20m#/pcirst# 23 pciclk 24 vss 25 req0#/pibgnt# 26 gnt0#/pibreq# 27 req1#/idegnt# 28 gnt1#/idereq# 29 ad31 30 ad30 31 ad29 32 vdd 33 ad28 34 ad27 35 ad26 36 ad25 37 ad24 38 vss 39 c/be3# 40 idsel 41 ad23 42 ad22 43 ad21 44 ad20 45 vdd 46 ad19 47 ad18 48 vss 49 ad17 50 ad16 51 c/be2# 52 lock# 53 frame# 54 irdy# 55 trdy# 56 devsel# 57 stop# 58 perr# 59 serr# 60 par 61 c/be1# 62 ad15 63 ad14 64 ad13 65 ad12 66 ad11 67 ad10 68 vss 69 ad9 70 vdd 71 ad8 72 c/be0# 73 ad7 74 ad6 75 ad5 76 ad4 77 ad3 78 ad2 79 ad1 80 vss 81 ad0 82 ideiorb# 83 ideiora# 84 ideiowb# 85 ideiowa# 86 idecs1#/nat/ leg# 87 idecs0# 88 da2 89 da0 90 da1 91 ideirqb 92 ideirqa 93 idedakb# 94 idedaka# 95 idechrdy 96 idedrqb 97 idedrqa 98 dd15 99 vdd 100 dd0 101 dd14 102 dd1 103 dd13 104 dd2 105 dd12 106 dd3 107 vss 108 dd11 109 dd4 110 dd10 111 dd5 112 dd9 113 dd6 114 dd8 115 dd7 116 security/xrd# 117 xoe# 118 xcs1/x8xcs 119 xcs0/romcs 120 irq8# 121 irq1 122 iochk# 123 sd7 124 vss 125 sd6 126 sd5 127 irq9 128 sd4 129 sd3 130 sd2 131 sd1 132 zws# 133 sd0 134 spkr 135 iochrdy 136 aen 137 smemw# 138 smemr# 139 iow# 140 ior# 141 memr# 142 memw# 143 master# 144 sa16 145 sa15 146 vss 147 sa14 148 sa13 149 sa12 150 refresh# 151 sa11 152 sa10 153 vdd 154 irq7 155 sa9 156 vss 157 irq6 158 sa 8 159 irq5 160 sa7 161 irq4 162 sa6 163 irq3 164 sa5 165 sa4 166 tc 167 sa3 168 bale 169 sa2 170 vss 171 sa1 172 osc 173 sa0 174 sbhe# 175 m16# 176 la23 177 io16# 178 la22 179 irq10 180 la21 181 irq11 182 la20 183 irq12 184 la19 185 vdd 186 irq15 187 la18 188 irq14 189 la17 190 drq2 191 drq3 192 dak1 193 drq1 194 dak2 195 dak0 196 drq0 197 sd8 198 drq5 199 sd9 200 bclk 201 vss 202 sd10 203 drq6 204 sd11 205 sd12 206 sd13 207 sd14 208 sd15
w83c553f pin descriptions winbond systems laboratory 12 note: pins direction and assignment may not reflect exact pins , refers to exact pin description . figure 2-2. w83c553f logic symbol diagram
w83c553f pin descriptions winbond systems laboratory 13 2.2 pin description s this section describes the location and function of each pin on the w83c553f. note the following conventions used in the tables: ? where more than one pin is listed for a signal, the first pin number corresponds to the most signi ficant bit of the bus. for example, the bus command and byte enables bits 3 to 0 (c/ be[3:0]#) use pins 1, 12, 22, and 31. ? active low is indicated by the pound (#) sign. for example, pcirst# is active low. six strap pins are marked bold.
w83c553f pin descriptions winbond systems laboratory 14 table 2-2. pci bus signals pin name pin # input/ output description pciclk 23 input clock. provides timing for all transactions on the pci bus. also divides down to generate bclk. a20m# / pcirst# 22 output address bit 20 mask or pci reset. this multi-function pin functions as address bit 20 mask when the w83c553f is in x86 mode, as determined by pin 8 strapping after power-up. it functions as pci reset when the w83c553f is in powerpc mode. it is driven for one millisecond duration after one of the following conditions: - pwrgd active edge - hot reset is set (port 92, bit 0) - reset drive is set (clock divisor register bit 3) pci reset is equivalent to isa reset logically inverted. ad[31:0] 29-31,33-37,41- 44, 46,47, 49, 50, 62-67, 69,71,73 - 79,81 input/ output address or data. these bits are multiplexed on the same pci pins. a valid 32-bit address is available during the address phase with frame# asserted. all subsequent cycles are the data phases. c/be[3:0]# 39, 51, 61, 72 input/ output bus command and byte enables. these bits are multiplexed on the same pci pins. during the address phase of a transaction, c/ be[3:0]# define the bus command. during the data phase, c/ be[3:0]# are used for byte enables. par 60 input/ output parity. even parity across ad[31:0] and c/be[3:0]#. par is valid one clock after the address phase. for data phases, par is valid one clock after either irdy# is asserted on the write transaction, or trdy# is asserted on a read transaction. par remains valid until one clock after the completion of the current phase. par is driven only for read data phases, and checked during write data phases.
w83c553f pin descriptions winbond systems laboratory 15 table 2-2 (continued). pci bus signals pin name pin # input/ output description frame# 53 input/ output cycle frame. indicates the start and duration of an access. it is asserted to indicate the start of a bus transaction; during which data transfers continue. when frame# is de-asserted, the transaction is in the final data phase. perr# 58 input/ output pci parity error. irdy# 54 input/ output initiator ready. indicates the initiating agent's ability to complete the current transaction's data phase. it is used jointly with trdy#. during a write, it indicates that valid data is present on ad[31:0]. during a read cycle, it indicates the master is prepared to accept data. trdy# 55 input/ output target ready. indicates the target's ability to complete the current data phase of the transaction. it is used with irdy#. during a read cycle, it indicates that valid data is present on ad[31:0]. during a write cycle, it indicates the target is prepared to accept data. devsel# 56 input/ output device select. this signal is asserted by the w83c553f when it is acting as a target in a transaction. it is an input when the w83c553f is acting as the initiator of a transaction. stop# 57 input/ output stop. this is asserted to terminate the current transaction. it causes a disconnect condition, limiting slave i/o cycles to one data transfer since i/o burst transfers are not supported. during master cycles, it indicates the target wants to terminate the cycle. idsel 40 input initialization device select. chip select signal, used during pci configuration read and write cycles. serr# 59 input/od system error. the w83c553f monitors the serr# pin to generate an nmi if enabled.
w83c553f pin descriptions winbond systems laboratory 16 table 2-2 (continued). pci bus signals pin name pin # input/ output description int[a:b]# 21-20 input pci interrupts. these pci interrupts can be routed to the programmable interrupt controller inside the w83c553f under software control. int[c:d]# 19-18 input/ od pci interrupts. these pci interrupts can be routed to the programmable interrupt controller inside the w83c553f under software control. lock# 52 input pci lock. lock# is used to indicate an atomic operation that may require multiple transactions to complete.
w83c553f pin descriptions winbond systems laboratory 17 table 2-3. pci arbiter signals pin name pin # input/ output description gnt0# / pibreq# 26 output this is a multifunction pin. the w83c553f pci-isa bridge (function 0) asserts this signal to request the use of the pci bus when the on-chip pci arbiter is disabled. this pin functions as gnt0# when the on-chip pci arbiter is enabled, allowing pci access to an external master. req0# / pibgnt# 25 input this is a multifunction pin. an external arbiter asserts this signal to grant the next pci access to the pci-isa bridge (function 0) when the on-chip pci arbiter is disabled. this pin functions as req0# when the on-chip pci arbiter is enabled. gnt1# / idereq# 28 output this is a multifunction pin. the w83c553f ide master (function 1) asserts this signal to request the use of the pci bus when the on- chip pci arbiter is disabled. this pin functions as gnt1# when the on-chip pci arbiter is enabled, allowing pci access to an external master. req1# / idegnt# 27 input this is a multifunction pin. an external arbiter asserts this signal to grant the next pci access to the ide master when the on-chip pci arbiter is disabled. this pin functions as req1# when the on-chip pci arbiter is enabled. arbdis# / gnt2# 16 input/ output when the on-chip pci arbiter is enabled, it uses this pin to grant the next pci access. if a 2.2k ohm resistor straps this pin to ground, the pci arbiter is disabled after power-up. this overrides the strapping of pci5th# on pin 13. req2# 17 input when the on-chip pci arbiter is enabled, external pci masters use this pin to request access to the pci bus.
w83c553f pin descriptions winbond systems laboratory 18 table 2-3 (continued). pci arbiter signals pin name pin # input/ output description pci5th# / gnt3# 13 input/ output when the on-chip pci arbiter is enabled, gnt3# behaves as a normal pci grant output. if a 2.2k ohm resistor straps this pin to ground, pin 6 and 7 function as gnt4# and req4# after power-up. if this pin is weakly strapped to vcc, pin 6 and 7 function as flshreq# and flshack# after power-up. the pci5th# function is overridden by the arbdis# function (i.e., if the on-chip pci arbiter is disabled, pin 6 and 7 function as flshreq# and flshack# no matter how pci5th# is strapped.) req3# 15 input when the on-chip pci arbiter is enabled, req3# behaves as a normal pci request input. gnt4# / flshreq# 6 output this is a multifunction pin which is alternately used to request flushing all buffers or granting pci access to an external master. req4# / flshack# 7 input this is a multifunction pin which is alternately used as flush acknowledge or as a pci access request input. pwrpc/x86# / cpugnt# 8 input/ output this multifunction pin is sampled by the w83c553f, following the pwrgd active edge. if a 2.2k ohm resistor is weakly pulling this pin to vcc at this time, the w83c553f is in powerpc mode. if a weak pull down resistor is connected to ground, the chip is in x86 mode. when the pci arbiter within the w83c553f is enabled (pin 16 arbdis#/gnt2# is weakly pulled high), this pin functions as the cpu grant output which allows the system cpu-to-pci bridge to have access to pci. cpureq# 9 input this input allows the system cpu to request access to the pci bus in systems with the pci arbiter within the w83c553f enabled.
w83c553f pin descriptions winbond systems laboratory 19 table 2-4. ide interface bus signals pin name pin # input/ output description idecs0# 87 output drive chip select 0. this signal is decoded from the ad bus to select both primary and secondary ide port command block registers. idecs1#/ nat/leg# 86 input/ output drive chip select 1. this signal is decoded from the ad bus to select both primary and secondary ide port auxiliary registers. native or legacy mode select. during reset, this pin is sampled as an input to set the native or legacy mode of the bus master ide controller (function 1). a high selects native mode and a low selects legacy mode. ideiowa# 85 output drive i/o write a. this signal is used jointly with idecs0# and idecs1#. the rising edge of ideiowa# latches data into the primary port ide device. ideiora# 83 output drive i/o read a. this signal is used jointly with idecs0# and idecs1#. the falling edge of ideiora# enables data from the primary port ide device. the data is latched internally on the rising edge of ideiora#. ideiowb# 84 output drive i/o write b. this signal is used jointly with idecs0# and idecs1#. the rising edge of ideiowb# latches data into the secondary port ide device. ideiorb# 82 output drive i/o read b. this signal is used jointly with idecs0# and idecs1#. the falling edge of the ideiorb# enables data from the secondary port ide device. the data is latched internally on the rising edge of ideiorb#.
w83c553f pin descriptions winbond systems laboratory 20 table 2-4 (continued). ide interface bus signals pin name pin # input/ output description idedrqa 97 input dma request a. this signal is the primary port dma handshake from the ide device. when asserted, it indicates a data transfer is requested. idedaka# 94 output dma acknowledge a. this is the primary port dma handshake to the ide device. when asserted, it indicates a data transfer can be executed. idedrqb 96 input dma request b. this is the secondary port dma handshake from the ide device. when asserted, it indicates a data transfer is requested. idedakb# 93 output dma acknowledge b. this is the secondary port dma handshake to the ide device. when asserted, it indicates a data transfer can be executed. da[2:0] 88,90,89 output ide drive address. dd[15:0] 98,101,103, 105,108, 110,112, 114,115, 113,111, 109,106, 104,102, 100 input/ output ide drive data. 16-bit bi-directional bus. idechrdy 95 input ide i/o channel ready. when idechrdy is negated, the current cycle will be extended. this input is connected to the primary port, and can also be connected to the secondary port. ideirqb 91 input ide irq b. secondary port interrupt request. ideirqa 92 input ide irq a. primary port interrupt request.
w83c553f pin descriptions winbond systems laboratory 21 table 2-5. isa bus signals pin name pin # input/ output description bclk 200 output isa bus clock. osc 172 input oscillator. 14 mhz input for generating the internal timer clock. la[23:17] 176,178, 180,182, 184,187, 189 input/ output latchable address. the current bus owner drives la[23:17] to provide 16m of memory space. sa[16:0] 144,145, 147-149, 151,152, 155,158, 160,162, 164,165, 167,169, 171,173 input/ output system address. sa[16:0] provides the 17 least significant address bits for memory accesses and sa[15:0] provides the entire 16 address bits for i/o accesses. master# 143 input isa master. master control signal from the isa bus. refresh# 150 input/ output isa dram refresh control. this pin is an open drain output and allows other masters to initiate refresh requests. memr# 141 input/ output memory read. acts as an output during pci master and dma cycles and as an input during isa master cycles. memw# 142 input/ output memory write. acts as an output during pci master and dma cycles and as an input during isa master cycles.
w83c553f pin descriptions winbond systems laboratory 22 table 2-5 (continued). isa bus signals pin name pin # input/ output description ior# 140 input/ output i/o read. act as an output during pci master and dma cycles and as an input during isa master cycles. iow# 139 input/ output i/o write. act as an output during pci master and dma cycles and as input during isa master cycles. smemr# 138 output memory read to address below 1m. an external pull-up resistor is required. smemw# 137 output memory write to address below 1m. an external pull-up resistor is required. zws# 132 input zero wait state. this signal is used by isa slaves to terminate a transfer cycle before the default ready counter expires. sbhe# 174 input/ output system byte high enable. sbhe# is asserted to indicate that data is being transferred on sd[15:8]. m16# 175 input/ output memory cycle 16-bit select. this signal is used by memory slaves to indicate 16-bit transfer capability. io16# 177 input i/o cycle 16-bit select. this signal is used by i/o slaves to indicate 16-bit transfer capability. iochk# 122 input i/o channel check. this assertion of this signal indicates an error has occurred.
w83c553f pin descriptions winbond systems laboratory 23 table 2-5 (continued). isa bus signals pin name pin # input/ output description iochrdy 135 input/ output i/o channel ready. this signal is used by isa slaves to extend the transfer cycle beyond the default ready timer expiration. bale 168 output bus address latch enable. this signal indicates that a valid address is on the bus. aen 136 output address enable. aen is asserted during dma cycles to prevent i/o devices from misinterpreting the cycle as a valid i/o cycle. tc 166 output termination count. this signal is asserted to indicate that a dma channel's word count has reached terminal count. drq[7:5, 3:0] 1,203,198, 191,190, 193,196 input dma request. dma service request from the dma controllers. dak[2:0] 194,192, 195 output encoded dma acknowledge. the channel number of the arbitration winner is encoded in binary. an external decoder is required to generate dack[7:5, 3:0]#. the inactive value is 100b. irq[15, 14, 12:9, 7:3] 186,188, 183,181, 179,127, 154,157, 159,161, 163 input interrupt request.
w83c553f pin descriptions winbond systems laboratory 24 table 2-5 (continued). isa bus signals pin name pin # input/ output description pmact# / isarst 5 output this multi-function pin functions as isa reset when the w83c553f is in powerpc mode, as determined by pin 8 strapping after power-up. it is driven for one millisecond duration after one of the following conditions: - pwrgd active edge - hot reset bit set (port 92, bit 0) - reset drive bit set (clock divisor register bit 3) isa reset is the inverted logical equivalent of pci reset. when the w83c553f is in x86 mode, this pin functions as power management active. it is the output signal to the cpu bridge which indicates the system activity status by becoming active when a break event has occurred. break events are programmed into pci configuration registers index 60h - 63h. sd[15:0] 208-204, 202,199, 197,123, 125,126, 128-131, 133 input / output bidirectional data bus.
w83c553f pin descriptions winbond systems laboratory 25 table 2-6. x bus signals pin name pin # input/ output description security / xrd# 116 output/ input x bus read. when active "0", data flows from xd to sd. when the w83c553f is in powerpc mode, this pin is sampled after reset and its value is reflected in bit 2 of the port 92 register (see page 107). irq1 121 input keyboard controller interrupt. irq8# 120 input real time clock interrupt. xoe# 117 output/ input x bus buffer enable. this signal enables an external x-bus buffer whenever an x-bus device is decoded. this pin is a strap pin, needs a 2.2k ohm resistor pull up, otherwise will be in test mode. xcs0/ romcs 119 output this is a multi-function pin. when the w83c553f is in powerpc mode, this pin functions as the chip select for an external rom, using default isa memory cycle timing. when the w83c553f is in x86 mode, this pin functions as the lower bit of the x-bus address. xcs1/x8xcs 118 output this is a multi-function pin. when the w83c553f is in powerpc mode, this pin functions as the chip select for ports in the 800h- 8ffh i/o address range. when the w83c553f is in x86 mode, this pin functions as the upper bit of the x-bus address. in x86 mode, an external decoder is required to decode the chip selects for x-bus devices: xcs[1:0] device 00 idle 01 rtc address latch 10 rtc data p ort 11 rom/bios or keyboard controller
w83c553f pin descriptions winbond systems laboratory 26 table 2-7. cpu interface and miscellaneous signals pin name pin # input/ output description int 10 output interrupt. interrupt signal from the w83c553f interrupt controller to the cpu. nmi 11 output non- maskable interrupt. init 3 output it functions as initialize cpu/software reset (init) when the w83c553f is in x86 mode, as determined by pin 8 strapping after reset. init is asserted for four pci clocks following one of these events: - hot reset bit set (port 92, bit 0) - cpu shutdown cycle - keyboard reset emulation bit is set (bit 1, index 4e) spkr 134 output speaker data. this output drives an externally buffered speaker. pwrgd 2 input power good signal from the power supply. this signal is used to generate other reset signals to reset the system. ferr#/irq13 12 input this multi-function pin's default function is interrupt request 13 (irq13). the numerical co-processor error (ferr#) function may be enabled by a bit in the function 0 pci configuration space at system control register (index 4eh, bit 4). ignne# / hreset# 4 output this multi-function pin functions as ignore numeric error (ignne#) when the w83c553f is in x86 mode as determined by pin 8 strapping after reset. it functions as hreset# when the w83c553f is in powerpc mode. for connection to the powerpc, hreset# is asserted for a duration of one millisecond after one of the following events: - pwrgd active edge - hot reset bit set (port 92 , bit 0) - cpu shutdown cycle - keyboard reset emulation bit is set (bit 1, index 4e)
w83c553f pin descriptions winbond systems laboratory 27 table 2-8. power and ground signals pin name pin # input/ output description vss 24,38,48, 68,80, 107,124, 146,156, 170,201 - these 11 pins are connected to the power supply ground. all vss pins must be connected for proper device operation. vdd 14,32,45, 70,99,153,185 - these 7 pins are connected to the power supply +5v. all vdd pins must be connected for proper device operation.
w83c553f electrical specifications winbond systems laboratory 28 3.0 system architect ure 3.1 overview the w83c553f is a multi-function pci device. "function 0" is the pci-to-isa bridge logic; "function 1" is the bus master ide controller. each function has its own separate pci configuration space and i/o register space. the w83c553f's bus hierarchy is designed to provide concurrency of operations performed on all buses simultaneously and is structured as follows: ? pci bus is primary i/o bus ? isa bus is secondary i/o bus the w83c553f accepts cycles from the pci bus and translates them onto the isa bus. it also requests the pci master bridge to generate pci cycles on behalf of ide dma or an isa master. the isa bus interface thus contains a standard isa bus controller and data buffering logic. isa control includes isa command generation, i/o recovery control, wait-state insertion, and data buffer routing. five isa slots can be supported without external buffering circuitry. the w83c553f initiates and performs standard isa bus refreshing. the integrated controller generates the command and refresh address to the isa bus. since an isa refresh is transparent to the pci bus and the dma cycle, an arbiter resolves any conflicts among pci, refresh, and dma cycles. ide data transfers are executed with two specific protocols. the standard protocol is to execute pio cycles on the pci bus and the dual ide interfaces. an enhanced protocol is supported, allowing the w83c553f to transfer data across the pci bus as a bus master directly to/from memory, and across the dual ide interfaces with single or multiword dma cycles. this protocol minimizes cpu overhead while maximizing the pci bus bandwidth. all ide pio protocol data transfers (8-bit, 16-bit and 32-bit) are automatically detected and supported. read ahead can be enabled for each individual device for 16-bit and 32-bit i/o read operations. this allows the controller to execute additional ide read cycles while the host is completing the previous memory write. posted writes can be enabled for each individual device for 16-bit and 32-bit i/o write operations which allow the ide controller to complete the present write cycle while the host executes the next system memory read operation maximizing the disk sub-system performance while reducing system overhead. bus master data/command transfers are supported as defined in the proposed pci "programming interface for bus master ide controller" specification rev. 1.0 (sff8038i). this allows the system microprocessor to be freed from the task of manually transferring data between the ide controller and the system memory as is required by the standard pio protocol. in a multitasking environment, the system cpu can perform other tasks with the maximum pci bus bandwidth available while data transfers are executed by the w83c553f.
w83c553f electrical specifications winbond systems laboratory 29 the ide interface is fully ansi cam compliant to the ata revision 3.0 and the ata-2 specifications. each storage device on the two ports is individually programmable to select the desired command on and off times to support ata defined pio modes 0 through 2 and multiword dma mode 0. also supported are sff pio modes 3, 4 and 5 (proposed) and multiword dma modes 1 and 2. the devices supported are ata compliant hard disks, tape drives, and cd roms. the w83c553f is compliant with the emerging atapi specification. two interrupt controllers can handle a total of 15 interrupt channels. irq0 is internally connected to out0, of the 82c54 counter/timer. usually an interrupt is generated by the rising edge of irq. irq8 and irq13, however, are fixed to trigger on the falling edge for direct connection to the real time clock interrupt or pentium cpu floating point error signal. rx 4d0h and rx4d1h can be programmed to change the irqs from edge sensitive to level sensitive interrupts. all external irq lines are not internally pulled-up. i/o port and channel definition matches the ibm pc/at requirement. types a, b, f dma are supported by the w83c553f. two integrated 82c37a dma controllers each generate memory addresses and control signals to transfer information between a peripheral device and memory, without cpu intervention. four dma channels permit 8-bit peripheral device data transfers. three channels permit 16-bit peripheral device data transfers. during a dma or master cycle, the cpu is held and the w83c553f takes control. both dma controllers support scatter/gather transfer capability on all channels and 32-bit addressing. the w83c553f has two basic operational states: reset and active. the reset state brings all internal logic to a known state, and configures some chip features. the active state is the normal operating state that allows software to perform chip configuration, access to the pci and isa register sets, and accessing of up to four ide devices. 3.2 active state when active, the w83c553f will monitor all pci bus cycles and respond to configuration and i/o cycles. the w83c553f will always respond to configuration cycles when properly addressed but will always respond to i/o cycles, as indicated in the internal configuration registers. configuration cycles are executed anytime the w83c553f idsel pin is asserted, a valid command is detected, and ad[1:0] are "0" during the address phase. configuration cycles are executed to program the w83c553f internal configuration register sets. i/o cycles will only be executed when enabled as indicated in the configuration registers. i/o cycles are used to transfer command/status and data to/from the ide devices, as well as to program the bus master register set.
w83c553f electrical specifications winbond systems laboratory 30 four basic data paths are provided. one provides the timing and control functions for 8-bit i/o cycles that communicate control/status information with the ide devices. a second data path provides the timing and control functions for 16-bit and 32-bit i/o cycles that are used to transfer data to/from the ide drives with the pio protocol. the third is used to access the internal configuration and bus master ide register set. the fourth data path is used for the bus master data transfer protocol. a block of logic is used to interface to the pci bus as well as separate 8-bit from 16/32-bit cycles and provide bus master support. a separate block of logic is used to control the ide interface and timing as well as control the packing and unpacking of the data between the ide buffer logic and the pci buffer logic. 3.3 bus structures table 3-1. address and data paths for basic cycles cycle address bus path data bus path isa-to-pci data read pci address/data->w83c553f ->latched & isa addressing isa data->w83c553f->pci address/data pci-to-isa data write pci address/data->w83c553f ->latched & isa addressing pci address/data->w83c553f ->isa data dma read w83c553f->pci address/data, w83c553f- >latched & isa address pci address/data->w83c553f ->isa data dma write w83c553f->pci address/data, w83c553f- >latched & isa address isa data->w83c553f->pci address/data isa refresh w83c553f->isa address
w83c553f electrical specifications winbond systems laboratory 31 3.4 pci-to-isa bridge the w83c553f pci system i/o provides the pci bus interface functions. it contains both pci master and slave bus bridging. when pibgnt# is asserted, the master bridge translates an isa master or dma cycle to the pci bus, based on the isa address decoder status. when pibgnt# is de-asserted, the slave bridge accepts these cycles, initiated from the pci bus, and targeted to the w83c553f's internal registers or isa bus. the pci address decoder supports the slave bridge in processing the pci master initiated cycles. the cycles are then forwarded to the isa bus interface for translation onto the isa bus. as a pci slave, the w83c553f responds to both i/o and memory transactions. it always target-terminates after the first data phase of a bursting cycle. it also converts a single interrupt acknowledge cycle into two cycles for the two internal 82c59s. the w83c553f functions as the subtractive decoder in a pci/isa system by accepting all accesses not positively decoded by some other device. this function only applies to the low 64 k i/o or low 16 m memory accesses. the w83c553f positively decodes i/o addresses for internal registers by asserting devsel# on the medium timing. in the x86 mode, the keyboard controller and rtc are subtractively decoded. as long as pibgnt# is asserted, the pci master bridge, on behalf of dma devices or isa masters, drives the pci address/data, c/ be[3:0]# and par signals. when memr# or memw# is asserted, the w83c553f sends frame# and irdy# to the pci bus if the targeted memory is not on the isa side. addresses and commands are valid during the address phase, while par is asserted one clock later. the w83c553f always activates frame# for 2 pclks because it does not conduct bursting cycles for pci-to-isa reads or writes. the isa address decoder determines the destination of the isa master or dma devices. it provides the following options, as defined in registers 48h to 4bh: ? memory space 0 - 512kb ? memory space 512 kb - 640 kb ? video buffer memory space 640 kb - 768 kb ? expansion rom memory space 768 kb - 896 kb, in eight 16 kb sections ? lower bios memory space 896 kb - 960 kb ? memory space within 1 mb - x mb - 16 mb. not accessible to the pci bus. ? memory space less than 16 mb automatically forward s to the pci. 3.5 pci bus cycles the pci bus cycle can be split into two phases, the address phase and the data phase. the address phase of a pci cycle is defined as the first rising clock edge when frame# is asserted. on this clock edge, c/ be[3:0]# contains the bus command that defines the pci bus cycle, ad [31:0] contains a valid address, and idsel will be stable and valid if it is a configuration cycle. all subsequent clocks comprise the data phase until the cycle is complete. if this cycle is claimed, devsel# will be asserted.
w83c553f electrical specifications winbond systems laboratory 32 the next rising clock edge identifies the beginning of the data phase. address parity is valid and will be checked or ignored depending on the state of the se bit of the device control register. the data phase can last one or more clock cycles. data will be transferred on the rising clock edge when both irdy# and trdy# are asserted. data parity will be generated (slave i/o read or bus master memory write cycle) or checked (slave i/o write or bus master memory read cycle) on the next rising clock edge. the w83c553f will report data parity errors on slave i/o write cycles it claims (by the assertion of devsel#) and bus master memory write cycles via the perr# signal when enabled. normally for i/o cycles frame# will be de-asserted when irdy# is asserted to signify that this is the last data transfer of the data phase. stop# will also be asserted with trdy# to prevent i/o bursting. multiple data phases (data bursting) are supported when operating as a bus master. table 3- 2 pci bus cycles c/be[3:0]# pci bus cycle slave mode master mode 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 interrupt acknowledge special cycle i/o read i/o write reserved reserved memory read memory write reserved reserved configuration read configuration write memory read multiple dual address cycle memory read line memory write and invalidate supported supported supported supported ignored ignored supported supported ignored ignored supported supported supported ( aliased to memory read) ignored supported ( aliased to memory read) supported ( aliased to memory write) not generated not generated not generated not generated not generated not generated supported supported not generated not generated not generated not generated supported not generated supported supported
w83c553f electrical specifications winbond systems laboratory 33 refer to figure 3-1. bus acquisition timing cycles are defined by the c/ be[3:0]# command lines during the address (ad) phase of each pci cycle. figure 3-1. bus acquisition timing
w83c553f electrical specifications winbond systems laboratory 34 3.6 pci i/o read cycle bursting is not supported by the w83c553f for i/o cycles, so a target disconnect will be executed after the first data transfer on all i/o read commands to prevent multiple i/o data phases. refer to figure 3-2. the slave i/o read command (c/ be[3:0]# = 2h during address phase) is used by the processor to read the w83c553f internal bus master registers, ide device, and isa registers or x-bus registers. it is a single, non-burst, 8, 16 or 32-bit transfer cycle, initiated by the cpu. it is a fixed duration, i.e. the w83c553f will assert trdy# on the 4th bus cycle of the transfer when accessing the internal bus master registers. it will have a variable duration when accessing an ide device or isa register. figure 3-2. slave i/o read timing
w83c553f electrical specifications winbond systems laboratory 35 3.7 pci i/o write cycle bursting is not supported by the w83c553f for i/o cycles, so a target disconnect will be executed after the first data transfer on all i/o write commands to prevent multiple i/o data phases. refer to figure 3-3. the slave i/o write command (c/ be[3:0]# = 3h during address phase) is used by the processor to write the w83c553f internal bus master registers, ide device, and isa registers or x-bus registers. it is a single, non-burst, 8, 16 or 32-bit transfer cycle, initiated by the cpu. it is a fixed duration, i.e. the w83c553f will assert trdy# on the 4th bus cycle of the transfer when accessing the internal bus master registers. it will have a variable duration when accessing an ide device or isa register. figure 3-3. slave i/o write timing
w83c553f electrical specifications winbond systems laboratory 36 3.8 pci configuration read cycle the configuration read command (c/ be[3:0]# = ah during address phase) is used in slave mode to read the configuration registers. 8-bit, 16-bit, 24-bit and 32-bit accesses are supported when the idsel is asserted and ad[1:0] are 00. the pci controller will respond to all configuration read cycles, even for bytes not used. a value of 00h will be read for each invalid byte selected in the configuration address space. during the pci address phase ad[7:2] define the dword accessed, while the byte enables (c/be[3:0]#) address the byte(s) within each dword. refer to figure 3-4. the slave configuration read command cycle is used by the host processor to read the pci configuration space in the w83c553f. this provides the processor with device information. it is a single, non-burst, 8, 16 or 32-bit transfer, of fixed duration, i.e. the w83c553f will assert trdy# on the 4th bus cycle of the transfer. figure 3-4. slave configuration read timing
w83c553f electrical specifications winbond systems laboratory 37 3.9 pci configuration write cycle the configuration write command (c/ be[3:0]# = bh during address phase) is used in slave mode to write to the configuration registers. 8-bit, 16-bit, 24-bit and 32-bit accesses are supported when the idsel is asserted and ad[1:0] are 00. the pci controller will respond to all configuration write cycles, even for bytes not used. during the pci address phase ad[7:2] define the dword accessed, while the byte enables (c/be[3:0]#) address the byte(s) within each dword. refer to figure 3-5. the slave configuration write command cycle is used by the host processor to write the pci configuration space in the w83c553f. this permits the processor to control basic w83c553f activity, such as enable/disable, change i/o location, etc. it is a single, non-burst, 8, 16 or 32-bit transfer, of fixed duration, i.e. the w83c553f will assert trdy# on the 4th bus cycle of the transfer. figure 3-5. slave configuration write timing
w83c553f electrical specifications winbond systems laboratory 38 3.10 pci memory read the memory read command (c/ be[3:0]# = 6h during the address phase) is only used when operating as a bus master. it will be used when transferring data to memory and the number of data phases is one half or less of the value programmed to the cache line size register, or when reading less than 2 dwords from memory. if the device needs to read more than 2 dwords from memory, the memory read line command is used. during the memory read cycle, the w83c553f issues a pci req# for the bus and, when pci gnt# is asserted, reads one dword from system memory. the bus is then released. the data phase in figure 3-6 takes two clock cycles, as determined by trdy#. the w83c553f activates all byte enables, even if some byte lanes do not contain valid data. it internally discards unnecessary bytes. in slave mode, pci-to-isa memory reads are supported. figure 3-6. master memory read timing
w83c553f electrical specifications winbond systems laboratory 39 3.11 pci memory write the master memory write command (c/ be[3:0]# = 7h during the address phase) cycle is used by the w83c553f when writing to memory. the w83c553f issues a request for the bus and, when granted access, writes one dword to system memory. the bus is then released. the data phase in figure 3-7 takes two clock cycles, as determined by trdy#. in slave mode, pci-to-isa memory writes and rom writes are supported. figure 3-7. master memory write timing
w83c553f electrical specifications winbond systems laboratory 40 3.12 pci memory read line the memory read line command (c/ be[3:0]# = eh during the address phase) is only used when operating as a bus master. it will be used when transferring data to memory and the number of data phases is at least two double words and is greater than one half of the value programmed to the cache line size register. in figure 3-8, the w83c553f issues a request for the bus and, when access is granted, reads eight dwords from system memory before releasing the bus. all data phases in this figure take one clock cycle, as determined by trdy#. figure 3-8. master memory read line timing 3.13 pci memory write and invalidate the memory write and invalidate command (c/ be[3:0]# = fh during the address phase) is only used when operating as a bus master and enabled as indicated by the state of the mwien bit of the device control register. it will be used when transferring data from memory and entire cache line(s) will be written (as programmed to the cache line size register).
w83c553f electrical specifications winbond systems laboratory 41 3.14 transaction termination the termination of a pci transaction can be initiated by either the master or target. during termination, the master controls the completion of all pci transactions, regardless of what caused the termination. all transactions are concluded when frame# and irdy# are de-asserted, indicating an idle cycle. when the w83c553f is a bus master, its pci bus cycles may be terminated by the target as a disconnect with data transfer, disconnect without data transfer, or target abort. the w83c553f's pci bus cycles may also be terminated by the w83c553f itself as a preemption or a master abort. 3.14.1 pci disconnect with data transfer timing the disconnect with data transfer command cycle of figure 3-9 shows one last data transfer occurring after the target asserts stop# to start the termination sequence. the data is still transferred, since irdy# and trdy# are asserted. the w83c553f terminates the current transfer with de-assertion of frame#, and the de-assertion of irdy#, at which point it releases the bus. the w83c553f will re-request the bus after two clock cycles if more data is to be transferred. the starting address of the new transfer will be the address of the next untransferred data. figure 3-9. disconnect with data transfer timing
w83c553f electrical specifications winbond systems laboratory 42 3.14.2 pci disconnec t without data transfer timing the disconnect without data transfer command cycle of figure 3-10 shows a target disconnect when no data is transferred. stop# is asserted without trdy# being asserted at the same time. the w83c553f terminates the current transfer with de- assertion of frame#, and the de-assertion of irdy#, at which point it releases the bus. the w83c553f will re-request the bus after two clock cycles if more data is to be transferred. the starting address of the new transfer will be the address of the next untransferred data (i.e. the address that the data would have been transferred to had the disconnect not occurred). figure 3-10. disconnect without data transfer timing
w83c553f electrical specifications winbond systems laboratory 43 3.14.3 pci target abort timing the target abort cycle of figure 3-11 starts when the target asserts devsel# for one clock, then de-asserts devsel# and asserts stop#. a target can use this sequence to indicate it cannot service the data transfer, and does not want the transaction retried. the w83c553f cannot assume any data transfers in the current transaction were successful. it terminates the current transfer with the de-assertion of frame#, and irdy#. since data integrity is not guaranteed, the w83c553f cannot recover from a target abort event. any on-going ide activity will be stopped immediately, and an interrupt will be generated if enabled. abort and error bits in the dma status register will be set. the pci configuration registers will not be cleared. the pci configuration space status register's rta bit will be set to indicate the w83c553f has received a target abort. figure 3-11. target abort timing
w83c553f electrical specifications winbond systems laboratory 44 3.14.4 pci preemption timing the main arbiter can void the pci gnt# signal sent to the w83c553f, if the current bus cycle takes too long, as in the case of dma bursts. when pci gnt# is removed, and the value in the latency timer register has reached zero, the w83c553f will finish the current transfer, and immediately release the bus. the timer in the w83c553f pci configuration space is programmable. the w83c553f will keep pci req# asserted to regain bus ownership. figure 3-12. preemption timing
w83c553f electrical specifications winbond systems laboratory 45 3.14.5 pci master abort timing a master abort sequence is initiated by the w83c553f to abort its cycle if devsel# is not asserted within four clocks after frame# is asserted. this sequence is treated as a fatal error. any ide activity will be terminated immediately. an nmi will be generated if programmed in register 40h, bit 0 (page 58.) the dma status register's abort and error bits will be set. the pci configuration registers will not be cleared. the pci configuration space status register's ma bit will also be set, to indicate the w83c553f has terminated its transaction using a master abort cycle. figure 3-13. master abort timing
w83c553f electrical specifications winbond systems laboratory 46 3.15 ide interface operation operation of the ide interface is controlled by the configuration registers. port 0 (primary port) and port 1 (secondary port) have the same features, capabilities and configuration options. all 8-bit timing is fixed. the following table shows the 8-bit fixed timing. although the 16-bit timing (host cycle 16/32-bit) is programmable on a cycle basis (on/off time), most of the 16-bit cycle timing is also fixed. address setup, address hold, and data hold (write) times will be the same as for the 8-bit cycles. data setup time will be equal to the write command on time. this allows the user to only program the command on/off times to select pio mode 0, 1, 2, 3, 4 or 5 (proposed), and dma single and multiword 0, 1 or 2 timing. much of the dma mode timing is also fixed. when dma transfers are executed on the ide interface, the selected ports' chip selects (idecs0# and idecs1# for primary and secondary) will be de-asserted (high) when the bmen bit in the associated bus master control register is set to "1." when the ide device asserts idedrq[a:b], the w83c553f will immediately assert idedak[a:b]# if bmen is set. one clock later the ideiow[a:b]# or ideior[a:b]# output will be asserted. for multiword dma transfers, the ideiow[a:b]# or ideior[a:b]# signal will free run at the programmed rate as long as drq remains asserted and the w83c553f is prepared to complete a data transfer. if idedrq[a:b] has not de- asserted by the rising edge of the ideiow[a:b]# or ideior[a:b]# signal multiword dma is assumed and at least one more cycle will be executed. if drq de-asserts at any time after idedak[a:b]# is asserted but before ideiow[a:b]# or ideior[a:b]# is de-asserted, this will be the last cycle until drq re-asserts. in this case, idedak[a:b]# will be de- asserted one clock after the ideiow[a:b]# or ideior[a:b]# signal de-asserts. this allows for the support of the single and multiword dma cycles automatically. table 3- 3 eight-bit fixed timing parameter time ( clks) spd ="1" command on 10 command off 10 address setup 3 address hold 1 data setup ( wr) 3 data hold ( wr) 1 cycle time 20 if clk < 33 mhz, then the timing in table 3-3 is ata mode 0 compatible.
w83c553f electrical specifications winbond systems laboratory 47 3.16 pio transfers when transferring data with the pio protocol, i/o read/write cycles are executed on the ide interface and pio transfers are executed on the pci bus. the ide interface address and chip select signals will only change when a decoded cycle is detected on the pci bus. this minimizes ide interface switching and emi noise. once a 16 or 32 bit cycle to a data port is detected, the w83c553f will setup the proper address and chip selects. once the address setup time has been met, ideior[a:b]# or ideiow[a:b]# will be asserted and held on until the on command time has been met. the w83c553f will then de-assert ideior[a:b]# or ideiow[a:b]# and hold the addresses and chip selects stable. if read ahead or posted writes are enabled for this device, read or write cycles will be executed at the programmed on/off timing until the read ahead buffer is full, the read ahead count is complete, or the posted write buffer is empty. this will maximize the ide interface performance because the address setup and hold timing will only add overhead at the beginning and end of a block transfer. all timing in between is controlled by the command on/off times or the host throughput which ever is slower. the ideior[a:b]# / ideiow[a:b]# signals will never be asserted (cycle committed) if the fifo is full/empty. if an 8 bit cycle to a different register is decoded on the pci bus while read ahead is active, the read ahead buffer will be preserved, the read ahead will pause and the 8 bit cycle will be executed. once the 8 bit cycle is completed the read ahead will resume if a 16 or 32 bit data port read is decoded on the pci bus. this allows for the host to check the status register during a data transfer without loosing data. if an 8 bit cycle to a different register is decoded on the pci bus while posted write is active, the posted write buffer will be written to the ide device while inserting wait states to the pci bus. once the write buffer is empty, the 8 bit cycle will be executed. the ide interface and buffers will not be affected by the w83c553f configuration cycle accesses. during data port read cycles with read ahead active, if an interrupt is detected on the ide interface it will not be passed to the pci bus until the data buffer is empty. the 16-byte pio fifo allows the two channels to transfer data simultaneously without corrupting data between the channels. past dual port chips required that interrupts be disabled during a data transfer because only one data fifo existed and being interrupted out of a transfer to access the second port caused the read ahead/posted write data in the fifo to be lost or corrupted. all accesses to configuration registers and all 8 bit ide accesses will be executed in the real time (read ahead and posted write not used). only 16 and 32 bit cycles to an ide data register will support read ahead or posted writes.
w83c553f electrical specifications winbond systems laboratory 48 3.17 32-bit data transfers 32-bit data transfers are used to reduce system overhead and improve performance. the standard pio protocol requires the system cpu to execute an i/o cycle and a memory cycle to move two bytes of data between the ide device and memory. to transfer 4 bytes of data would require two i/o cycles and two memory cycles. this can be accomplished with one 32-bit i/o and one 32-bit memory cycle. this cuts the cpu cycles in half. by enabling read ahead, the ide read cycles will be buffered from the pci bus and execute in parallel with the system memory reads cutting overhead more. enabling posted writes will similarly improve write performance. pci bus 32-bit pio write cycle ide write cycle with posted writes pci bus 32-bit pio read cycle ide read cycle with read ahead the two drawings shown above show the relationship between the pci bus and the ide interface.
w83c553f electrical specifications winbond systems laboratory 49 3.18 bus master transfers when operating as a bus master on the pci bus, dma cycles will be executed on the ide interface. in this mode, once the bmen bit of the bus master control register is set the w83c553f will de-assert the chip selects for that port and respond to drq as defined above. if an interrupt is generated on the ide interface, it will be delayed for ide device to memory transfers until the fifo is empty (written to memory). the ideiow[a:b]#/ideior[a:b]# will be held high and not asserted (pause) any time that the fifo is empty/full. to maximize the pci bus bandwidth, the bus master fifo is independent of the pio fifos. it is 64 bytes deep which allows the w83c553f to burst transfers of 8 double words consistently. this allows the use of the memory read line and memory write and invalidate commands. if both ports operate in the bus master mode, they will share the same fifo and a fairness arbitration will be employed to guarantee both ports have transfer time slices. using this protocol to transfer data relieves the system cpu overhead by 90% typically. this is achieved because the cpu only needs to send the command to the target ide device, set up the bus master prd table, and program the bus master register set. there will only be one interrupt per command to service, whereas pio commands require one interrupt per sector or block of sectors, and the cpu must manually transfer all data. pci bus utilization is also reduced by up to 90% over the standard pio protocol. the bus master core can transfer one sector of data with less than 6 microseconds of active bus time, regardless of the ide device transfer rate. the same pio transfer requires over 150 microseconds of active bus time, when using a mode 0 ide device. 3.19 82c59a interrupt controller two interrupt controllers are included in the w83c553f, and are internally cascaded to handle a total of 15 interrupt channels. irq0 is internally connected to out0, of the 82c54 counter/timer. typically, an interrupt is generated by the rising edge of an irq signal. however, irq8 and irq13 are fixed to trigger on the falling edge, allowing direct connection to the real time clock interrupt (irq8#), or pentium cpu floating point error signal (ferr#). also, rx 4d0h and rx 4d1h can be programmed to change the irqs from edge sensitive to level sensitive interrupts. all external irq lines are internally pulled-up to eliminate noises on unconnected request pins. i/o port and channel definition matches that of the ibm pc/at requirement. 3.20 82c37a dma controller two 82c37a dma controllers are integrated into the w83c553f. each controller is a four channel dma device, generating memory addresses and control signals necessary to transfer information between a peripheral device and memory, without cpu intervention. the two controllers are cascaded to provide four dma channels permitting 8-bit peripheral device data transfers. three channels permit 16-bit peripheral device data transfers. the i/o port and channel definition matches that of the ibm pc/at requirement. type a, b and f dma are supported in the w83c553f. both dma controllers support full 32-bit addressing and scatter/gather transfer capability.
w83c553f electrical specifications winbond systems laboratory 50 3.21 82c54 counter/timer one 82c54 counter/timer, with three channels, is included in the w83c553f. the clocks for the three channels are connected to the 14.31818 mhz clock through a divide-by-twelve counter. the gate inputs of counters 0 and 1 are tied high so that they are always enabled. the gate input of counter 2 is tied to bit 0 of port b, inside the chip. the output of counter 0 is connected to the irq0 input of the interrupt controllers. the output of counter 1 goes to the arbitration logic for a refresh request. finally, the output of counter 2 goes to an and gate, which drives the spkr output pin. the other input to this and gate comes from bit 1 of port b. 3.22 pci arbiter the w83c553f contains a programmable, eight master pci arbiter which can be tailored to meet system-specific arbitration requirements. pin 16 is available to strap the arbiter into its disabled state on power-up. a weak 2.2k ohm pull-down resistor is recommended for this in systems using an external arbiter. when disabled, the "function 0" isa bridge uses the req#/gnt# pair on pins 25 and 26, and the "function 1" ide uses the req#/gnt# pair on pins 27 and 28. if no pull- down resistor is used on pin 16, the on-chip arbiter will "come up" enabled after power up. when in the active state, the eight masters supported by the w83c553f are its two internal masters (isa bridge and ide) , the system cpu, and req#/gnt#[4:0] which are available to the system designer. the pci5th# function of pin 13 can be used to change the fifth req#/gnt# pair (on pins 6 and 7) to flshreq#/flshack# if desired (in either cpu mode). this pci5th# function is automatically overidden by the arbdis# pin when enabled. flshreq#/flshack# are only used in guaranteed access timing (gat) mode. in gat mode, before function 0 makes a request for the pci bus, it asserts flshreq# to the system and waits for flshack# to be asserted. the system can use this signal to flush all pci buffers so that the w83c553f can be granted unimpeded access to main memory. when function 0 (pci-to-isa bridge) is not in gat mode, it behaves as any other pci master device. upon power-up, the arbiter defaults to a "round-robin" rotation scheme allowing all pci masters equal access to the local bus. if desired, the relative priority of each req/gnt pair can be custom tailored to a specific system design via the pci priority control register 1 at index 80h in the function 0 pci configuration space. note that all masters are assured of access to the pci bus at least once during each rotation regardless of the programming options chosen. (this is required for pci compliance, so no functions are "locked out" for an extended period).
w83c553f electrical specifications winbond systems laboratory 51 3.23 break events break events include irq0 - irq15, drq0 - drq7, serr#, isa iochk#, intr and non- maskable interrupts to the cpu (nmi). oem designers can program function 0 pci configuration registers 60h - 63h to select individual irqs and drqs as the break events. these registers allow the w83c553f to function within a comprehensive power management scheme with an external power management unit (as located on cpu-to-pci bridge devices) in a green pc application. 3.24 cpu modes (x86 or powerpc) the w83c553f incorporates two different cpu modes which change the functionality of several pins on the chip. an x86 mode supports any intel-compatible microprocessor, including pentium, amd k5, cyrix m1, nexgen 586, intel p6, and others. a powerpc mode supports the ibm/apple/motorola powerpc microprocessor common hardware reference platform, as well as other risc cpus, such as dec alpha, sun sparc, and mips r4xxx cpus. following is a summary of pins which change functionality depending on which cpu mode is chosen for the w83c553f via strapping pin 8 high (powerpc) or low (x86) with a weak (2.2k ohm) resistor: pin # x86 function powerpc function 4 ignne# hreset# 5 pmact# isarst 22 a20m# pcirst# 116 xrd# security/xrd# 118 xcs1 x8xcs 119 xcs0 romcs it can be seen from the above table (and the respective pin descriptions on pages 12-25) that the w83c553f is able to generate all of the required reset signals for the microprocessor, pci bus, and isa bus when in powerpc (non-x86) mode.
w83c553f electrical specifications winbond systems laboratory 52 4.0 register inform ation the w83c553f sio controller with pci arbiter is a multi-function pci device. function 0 is the isa bridge, and function 1 is the bus master ide controller. the registers summarized in this section are organized as follows: ? pci configuration space - isa bridge registers (function 0) ? isa bridge (function 0) i/o registers ? pci configuration space - bus master ide registers (function 1) ? bus master ide (function 1) i/o registers each function of the w83c553f sio chip supports a complete set of configuration registers as defined in the pci spec. rev. 2.1 for a 32-bit bus implementation. additional configuration registers are supported for bus master and ide port/device control. they can be accessed whenever the pcirst# signal is de-asserted. these registers are internal to the w83c553f, and control the operation of the chip when responding to bus i/o cycles. they are accessed when a configuration bus cycle is executed with idsel asserted and ad[1:0] both low. all registers are implemented as 32-bit registers and the c/ be[3:0]# inputs determine which byte lanes are read/written. this allows the registers to be accessed 8, 16, 24, or 32 bits at a time. the specific 32-bit register is directly addressed by ad[7:2]. all reserved bits and bytes return a logic 0 when read. all reserved bytes written will execute normal pci cycles, but will not affect the operation or device registers. the internal register information for the w83c553f is organized as follows: ? register name and index value offset from base address. ? type (read and/or write). ? bit description.
w83c553f electrical specifications winbond systems laboratory 53 w83c553f register accessibility functional block address range (hex) isa pci broadcasted config. space 0-ff x p pic 1 20-21 x p x p counter/timer 40-43 x p x p port b 61 x p x p rtc index (shadow) 70 write x p x p x p dma page 81, 82, 83, 87, 89, 8a, 8b x p x p port 92 92 x p x p x p pic2 a0-a1 x p x p co-processor error f0 write x x x dma1 0-f x p bmtr 78-7b x p dma2 c0-de x p interrupt mode 4d0-4d1 x p rtc cmos ram 810, 812 p p x = accessible in x86 mode p = accessible in powerpc mode
w83c553f electrical specifications winbond systems laboratory 54 4.1 pci confi guration space - isa bridge registers (function 0) 4.1.1 function 0 header registers vendor id register (default = 10adh) bit description : bits [15:0]: vendid. vendor id for symphony laboratories is 10adh. device id register (default = 0565h) bit description : bits [15:0]: devid. device id for isa bridge is 0565h.
w83c553f electrical specifications winbond systems laboratory 55 command register (default = 0007h) type: read/write bit description : bits [15:10]: reserved. these read only bits are all set to "0". bit 9: fast back-to-back enable. w83c553f does not generate fast b ack-to-back cycles. this read only bit is set to "0". bit 8: serr# enable. w83c553f does not drive the serr# pin. defaults to "0". bit 7: wait cycle control. w83c553f does not use address/data stepping. this read only bit is set to "0". bit 6: parity error response. this is a read/write bit. bit 5: vga palette snoop. w83c553f is not a vga device. this read only bit is set to "0". bit 4: memory write and invalidate enable. w83c553f does not generate memory write and invalidate commands. this read only bit is set to "0". bit 3: special cycles. w83c553f ignores all special cycles when reset. defaults to "0". bit 2: bus master. always enabled. this read only bit is set to "1". bit 1: memory space. always enabled. this read only bit is set to "1". bit 0: i/o space. always enabled. this read only bit is set to "1".
w83c553f electrical specifications winbond systems laboratory 56 status register (default = 0200h) type: read/write bit description : bit 15: detected parity error (dpe). this bit is read/write. bit 14: signaled system error (sse). bit 13: received master abort (rma). this bit is read/write. bit 12: received target abort (rta). this bit is read/write. bit 11: signaled target abort (sta). this bit is read/write. bits [10:9]: devsel# timing (dvslt). medium speed. these read only bits are both set to "01". bit 8: master data parity error detected (mdpe). this bit is read/write. bit 7: fast back-to-back capable (fb2bc). w83c553f does not decode fast back-to-back cycles across different targets. this read only bit is set to "0". bit 6: ud f supported (udfs). w83c553f does not support user definable features. this read only bit is set to "0". bit 5: 66 mhz capable (pci66c). w83c553f does not support 66 mhz bus speed. this read only bit is set to "0". bits [4:0]: reserved. this read only bit is set to "0". signaled target abort
w83c553f electrical specifications winbond systems laboratory 57 revision id register (default = 00h) bit description : bits [7:0]: revid. revision id for isa bridge is 00h. class code register (default = 060100h) bit description : bits [23:16]: bclass. base class is 06h. bridge device. bits [15:8]: sclass. sub-class is 01h. isa bus. bits [7:0]: progif. programming interface is 00h. header type register (default = 80h) bit description : bit 7: mfcn. multi-function device is "1". w83c553f contains two functions (isa bridge and ide master). bits [6:0]: cfglay. configuration layout is 00h. non-pci-to-pci bridge device.
w83c553f electrical specifications winbond systems laboratory 58 4.1.2 function 0 control registers pci control register (default = 20h) type: read/write bit description : bit 7: reserved. this read only bit is set to "0". bit 6: reserved. bit 5: iae. interrupt acknowledge enable. setting this bit allows the w83c553f chip to respond to the interrupt acknowledge command. this bit is active after reset. bit 4: reserved. this read only bit is set to "0". bit 3: esdp. early subtractive decoding point. setting this bit will move the subtractive decoding point one pci clock earlier from "slow" to "medium" timing. bit 2: pwe. post write enable. setting this bit will allow pci memory write cycles to the isa bus to be posted. bit 1: retrye. retry enable. when this bit is set to "1", pci slave cycles are retried when the internal bus is busy. when this bit is reset to "0" and the internal bus is busy, a pci slave cycle will be held in wait states until the bus becomes idle and the access completes. the default state of this bit after a hardware reset is "0". bit 0: pci nmi enable. when set, pci error status bits in the status regi ster (except sse) will generate an nmi. defaults to "0".
w83c553f electrical specifications winbond systems laboratory 59 scatter/gather relocation base address register (default = 04h) function: the value programmed into this register determines the high order i/o adress of the scatter/gather command registers, scatter/gather status registers, and scatter/gather descriptor table registers. the first scatter/gather register default address is at 0410h. type : read/write bit description : bits [7:0]: ad[15:8]. these are the address bits of the relocated address space.
w83c553f electrical specifications winbond systems laboratory 60 line buffer control register (default = 00h) type: read/write bit description: bits [7:4]: reserved. bits [3:2]: isa master line buffer configuration. bit 3 2 function 0 0 single transaction 0 1 reserved 1 0 reserved 1 1 reserved bits [1:0]: dlbc. dma line buffer configuration. bit 1 0 function 0 0 single transaction 0 1 reserved 1 0 reserved 1 1 reserved ide interrupt routing control register (default = efh) type: read/write bit description : bits [7:4]: irqarch [3:0]. routes ide primary port irq to the interrupt controller. defaults to eh (irq14). bits [3:0]: irqbrch [3:0]. routes ide secondary port irq to the interrupt controller. defaults to fh (irq15).
w83c553f electrical specifications winbond systems laboratory 61 pci interrupt routing control register (default = 0000h) type: read/write bit description : bits [15:12]: intarch [3:0]. inta# routing channel. this field specifies the routing channel for inta#. note channels 0, 1, 2, 8 and 13 are reserved. setting this field to these values will disable routing. default value after a hardware reset is "0". bits [11:8]: intbrch [3:0]. intb# routing channel. this field specifies the routing channel for intb#. note that channels 0, 1, 2, 8 and 13 are reserved and setting this field to any of these values will effectively disable routing. the default value after a hardware reset is "0". bits [7:4]: intcrch [3:0]. intc# routing channel. this field specifies the routing channel for intc#. note that channels 0, 1, 2, 8 and 13 are reserved and setting this field to any of these values will effectively disable routing. the default value after a hardware reset is "0". bits [3:0]: intdrch [3:0]. intd# routing channel. this field specifies the routing channel for intd#. note that channels 0, 1, 2, 8 and 13 are reserved and setting this field to any of these values will effectively disable routing. the default value after a hardware reset is "0".
w83c553f electrical specifications winbond systems laboratory 62 bios timer base address register (default = 0078h) type: read/write function: the base address for the bios timer regi ster located in pci i/o space. the bios timer resides in the w83c553f and is the only internal resource mapped to pci i/o space. bit description : bits [15:2]: btmrba. bios timer base address. this register specifies the base address 15:2 for the bios timer register located in the i/o space. the lower two bits of the base address are 00 ( dword aligned). the value of this register points to 78h (0000_0000_0111_10xx) after a reset. bit 1: reserved. bit 0: btmre. timer enable. when this bit is set to " 1", the bios timer function is enabled and the base address of the timer registers is programmed in bits [15:2].
w83c553f electrical specifications winbond systems laboratory 63 isa-to-pci address decoder control register (default = 01h) type: read/write bit description : bits [7:4]: ipatom [3:0]. top of main m emory. defines the top of memory for isa memory space. isa memory accesses from 1 mbyte to top of memory (except "hole") and above 16 mbyte are forwarded to the pci bus. bit 7 bit 6 bit 5 bit 4 top of memory 0 0 0 0 1 mbyte 0 0 0 1 2 mbyte 0 0 1 0 3 mbyte 0 0 1 1 4 mbyte 0 1 0 0 5 mbyte 0 1 0 1 6 mbyte 0 1 1 0 7 mbyte 0 1 1 1 8 mbyte 1 0 0 0 9 mbyte 1 0 0 1 10 mbyte 1 0 1 0 11 mbyte 1 0 1 1 12 mbyte 1 1 0 0 13 mbyte 1 1 0 1 14 mbyte 1 1 1 0 15 mbyte 1 1 1 1 16 mbyte bit 3: mbelbios. low bios memory block enable ; 896-960 kbyte (e0000-effffh). when set to "1", isa memory accesses in this range are forwarded to the pci bus. the lbioscse bit (ubcsa, configuration register 4dh bit 6) overrides this bit. bit 2: mbevga. vga memory block enable ; 640-768 kbyte (a0000-bffff). when set to "1", isa memory accesses in this range are forwarded to the pci bus. bit 1: mbe640. memory block enable ; 512-640 kbyte (80000-9ffffh). when set to "1", isa memory accesses in this range are forwarded to the pci bus. bit 0: mbe 512. memory block enable ; 0-512 kbyte (0-7ffffh). when set to "1", isa memory accesses in this range are forwarded to the pci bus. this bit is set to "1" after reset.
w83c553f electrical specifications winbond systems laboratory 64 isa rom address decode enable register (default = 00h) function : when a bit is set to "1", memory accesses to the corresponding address range in the add-on bios area are forward to the pci bus. type : read/write bit description : bit 7: mbedc. memory block enable ; 880-896 kbyte. (dc000-dffffh). bit 6: mbed8. memory block enable ; 864-880 kbyte. (d8000-cbfffh). bit 5: mbed4. memory block enable ; 848-864 kbyte. (d4000-c7fffh). bit 4: mbed0. memory block enable ; 832-848 kbyte. (d0000-c3fffh). bit 3: mbecc. memory block enable ; 816-832 kbyte. (cc000-cffffh). bit 2: mbec8. memory block enable ; 800-816 kbyte. (c8000-cbfffh). bit 1: mbec4. memory block enable ; 784-800 kbyte. (c4000-c7fffh). bit 0: mbec0. memory block enable ; 768-784 kbyte. (c0000-c3fffh).
w83c553f electrical specifications winbond systems laboratory 65 isa-to-pci memory hole start address register (default = 00h) type: read/write bit description : bits [7:0]: ipaha. memory hole start address. these 8 bits specify the 8 most significant bits of the isa address : la[23:16]. bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 la23 la22 la21 la20 la19 la18 la17 sa16 isa-to-pci memory hole size register (default = 00h) type: read/write bit description : bit 7: ipahe. memory hole enable. when this bit is set to "1", access to the memory hole will not be forwarded to the pci bus. when this bit is reset to "0", access to the hole will be forwarded to the pci bus. the default value of this bit after a chip reset is "0". bits [6:0]: ipahs. memory hole size. this field specifies the sizes of the memory hole according to the following list: bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 0 0 0 0 0 0 0 = 64 kbytes 0 0 0 0 0 0 1 = 125 kbytes 0 0 0 0 0 1 1 = 256 kbytes 0 0 0 0 1 1 1 = 512 kbytes 0 0 0 1 1 1 1 = 1 mbytes 0 0 1 1 1 1 1 = 2 mbytes 0 1 1 1 1 1 1 = 4 mbytes 1 1 1 1 1 1 1 = 8 mbytes all other combinations are reserved.
w83c553f electrical specifications winbond systems laboratory 66 clock divisor register (default = 00h) type: read/write bit description : bits [7:4]: reserved. bit 3: rstdrv. reset drive, valid only in powerpc mode. when this bit is set, pcirst# and isarst are enabled for 1 ms . this bit then clears (resets) itself. bits [2:0]: clock select (clksel). this field selects the divisor for generating bclk from pciclk. combinations not listed are reserved. bit 2 bit 1 bit 0 0 0 0 = 4 0 0 1 = 3 0 1 0 = 2 1 0 0 = 6 1 0 1 = 8
w83c553f electrical specifications winbond systems laboratory 67 chip select control register (default = 33h) type: read/write bit description : bit 7: ebioscse. extended bios enable. 0= disabled 1= memory access from fff80000h to fffdffffh will assert romcs in powerpc mode or the encoded output xcs[1:0 = 11 in x86 mode. bit 6: lbioscse. lower bi os enable. 0= disabled 1= memory access from fffe ,0000h to fffe,ffffh or ffee,0000 to ffee,ffff or 000e,0000 to 000e,ffff will assert romcs in powerpc mode or the encoded output xcs[1:0] = 11 in x86 mode. bit 5: bioswp. bios write protect. 0= disable d 1= when set, romcs in powerpc mode or the encoded output xcs[1:0] = 11 in x86 mode will not be generated for write access to the bios space. bit 4: ubioscse. upper bios chip select enable. this bit defaults to "1" after reset. 0= disabled 1= for revisi on id 0, memory access from ffff ,0000h to ffff,ffffh or ffef,0000 to ffef,ffff or 000f,0000 to 000f,ffff will assert romcs in powerpc mode or the encoded output xcs[1:0] = 11 in x86 mode. for revision id 4, memory access will be from 000f ,0000 to 000f,ffff or ff80,0000 to ffff,ffff.. bits [3:2]: reserved. bit 1: kbcse. keyboard controller address location enable. . 0= disabled 1= access to the i/o ports 60h, 62h, 64h, or 66h will give the encoded output xcs[1:0] = 11 for keyboard chip select in x86 mode. this bit is reserved in the powerpc mode. bit 0: rtccse. rtc address location enable. 0= disabled 1= access to the i/o ports 70-77h will give the encoded output xcs[1:0] = 01 for for rtc data port in x86 mode. this bit is reserved in the powerpc mode.
w83c553f electrical specifications winbond systems laboratory 68 at system control register (default = 04h) type: read/write bit description : bit 7: reserved. bit 6: isa refresh enable. bit 5: reserved, always 0. bit 4: ferr# enable. if this bit is set to "1," pin 12 will function as the numeric co-proces sor error input. bit 3: reserved. bit 2: p92e. port 92 enable. when enabled, access to port 92 is enabled. when disabled, cycle will be passed to the isa bus. bit 1: keyboard rc emulation enable. in x86 mode, this bit decodes the keyboard reset command and generates init for at more than 4 pci clocks. in powerpc mode, this bit decodes the keyboard reset command and generates hreset# for 1ms. bit 0: keyboard gate a20 emulation enable. this bit toggles the gate a20 output in x86 mode, depending on the keyboard command.
w83c553f electrical specifications winbond systems laboratory 69 at bus control register (default = 00h) type: read/write bit description : bits [7:3]: reserved. bit 2: i/o recovery time. 0 = normal 1 = 4 bclk delay for 16-bit i/o and 8 bclk for 8-bit i/o access bit 1: extended ale. 0 = d isable 1 = enable bit 0: reserved.
w83c553f electrical specifications winbond systems laboratory 70 irq break event enable 0 register (default = 00h) function: this power management register may only be used while the w83c553f is in x86 mode. type : read/write bit description : bit 7: irq7. enable irq7 as br eak event. when this bit is "1," irq7 as break event detection is enabled. upon detection, pmact# is de-asserted. bit 6: irq6. enable irq6 as break event. when this bit is "1," irq6 as break event detection is enabled. upon detection, pmact# is de-asserted. bit 5: irq5. enable irq5 as break event. when this bit is "1," irq5 as break event detection is enabled. upon detection, pmact# is de-asserted. bit 4: irq4. enable irq4 as break event. when this bit is "1," irq4 as break event detection is enabled. upon detection, pmact# is de-asserted. bit 3: irq3. enable irq3 as break event. when this bit is "1," irq3 as break event detection is enabled. upon detection, pmact# is de-asserted. bit 2: irq2. enable irq2 as break event. when this bit is "1," irq2 as break event detection is enabled. upon detection, pmact# is de-asserted. bit 1: irq1. enable irq1 as break event. when this bit is "1," irq1 as break event detection is enabled. upon detection, pmact# is de-asserted. bit 0: irq0. enable irq0 as break event. when this bit is "1," irq0 as break event detection is enabled. upon detection, pmact# is de-asserted.
w83c553f electrical specifications winbond systems laboratory 71 irq break event enable 1 register (default = 00h) function: this power management register may only be used while the w83c553f is in x86 mode. type : read/write bit description : bit 7: irq15. enable irq15 as break event. when this bit is "1," irq15 as break event detection is enabled. upon detection, the pmu will de-assert pmact#. bit 6: irq14. enable irq14 as break event. when this bit is "1," irq14 as break event detection is enabled. upon detection, the pmu will de-assert pmact#. bit 5: irq13. enable irq13 as break event. when this bit is "1," irq13 as break event detection is enabled. upon detection, the pmu will de-assert pmact#. bit 4: irq12. enable irq12 as break event. when this bit is "1," irq12 as break event detection is enabled. upon detection, the pmu will de-assert pmact#. bit 3: irq11. enable irq11 as break event. when this bit is "1," irq11 as break e vent detection is enabled. upon detection, the pmu will de-assert pmact#. bit 2: irq10. enable irq10 as break event. when this bit is "1," irq10 as break event detection is enabled. upon detection, the pmu will de-assert pmact#. bit 1: irq9. enable ir q9 as break event. when this bit is "1," irq9 as break event detection is enabled. upon detection, the pmu will de-assert pmact#. bit 0: irq8. enable irq8 as break event. when this bit is "1," irq8 as break event detection is enabled. upon detection, the pmu will de-assert pmact#.
w83c553f electrical specifications winbond systems laboratory 72 additional break event enable register (default = 00h) function: this power management register may only be used while the w83c553f is in x86 mode. type : read/write bit description : bit 7: reserved. bit 6: pci serr #. serr detection enable. when this bit is "1," serr detection is enabled. upon detection, the pmu will de-assert pmact#. bit 5: irq0clr. irq0 clear. to clear irq0, write a "1", followed by a "0", to this bit. bit 4: isa iochk#. iochk detection enabl e. when this bit is "1," iochk detection is enabled. upon detection, the pmu will de-assert pmact#. bit 3: pci perr#. perr detection enable. when this bit is "1," perr detection is enabled. upon detection, the pmu will de-assert pmact#. bit 2: nmi. n mi detection enable. when this bit is "1," nmi detection is enabled. upon detection, the pmu will de-assert pmact#. bit 1: interrupt. intr detection enable. when this bit is "1," intr detection is enabled. upon detection, the pmu will de-assert pmact#. bit 0: pmumgen. global enable of break events. when this bit is "1," global break event detection is enabled. upon detection, the pmu will de-assert pmact#.
w83c553f electrical specifications winbond systems laboratory 73 dma break event enable register (default = 00h) function: this power management regis ter may only be used while the w83c553f is in x86 mode. type : read/write bit description : bit 7: drq7. enable drq7 as break event. when this bit is "1," drq7 detection is enabled. upon activation, the pmu will de-assert pmact#. bit 6: drq6. enable dr q6 as break event. when this bit is "1," drq6 detection is enabled. upon activation, the pmu will de-assert pmact#. bit 5: drq5. enable drq5 as break event. when this bit is "1," drq5 detection is enabled. upon activation, the pmu will de-assert pmact#. bit 4: drq4. enable drq4 as break event. when this bit is "1," drq4 detection is enabled. upon activation, the pmu will de-assert pmact#. bit 3: drq3. enable drq3 as break event. when this bit is "1," drq3 detection is enabled. upon activation, the pmu will de-assert pmact#. bit 2: drq2. enable drq2 as break event. when this bit is "1," drq2 detection is enabled. upon activation, the pmu will de-assert pmact#. bit 1: drq1. enable drq1 as break event. when this bit is "1," drq1 detection is ena bled. upon activation, the pmu will de-assert pmact#. bit 0: drq0. enable drq0 as break event. when this bit is "1," drq0 detection is enabled. upon activation, the pmu will de-assert pmact#.
w83c553f electrical specifications winbond systems laboratory 74 level 1 arbiter there are two control bits for bank 1,2,3 modules. the " pfix" bit determines the fixed priority of the bank. the " protat" bit determines whether to rotate the priority scheme of the bank after a grant is given. if the " protat" bit is not set, the arbiter will give one request line higher priority all the time. if the " protat" bit is set, the priority of the request lines are rotated after each grant to the higher priority line. for bank 0, the " pfix" value is fixed to 0 and the " protat" value is fixed to 0 also. pfix = 0 pfix = 1 bank 1 sioreq# > req0# req0# > sioreq# bank 2 req1# > req2# req2# > req1# bank 3 cpureq# > req3# req3# > cpureq# level 2 arbiter for bank 4, there are 2 bits, " fpmod [1:0]", indicating the fixed priority of the bank. there is one bit, "bk4rc", controlling the rotation of priority schemes. there are a total of 4 priority schemes each. a total of 8 slots are available on the round-robin rotation. 4 slots are assigned with a priority scheme each. 4 other slots are programmable with selected priority schemes. fpmod[1:0] priority schemes slots 00 idereq# > bk1win > bk3win bank 0
w83c553f electrical specifications winbond systems laboratory 75 function : these register locations are reserved. software should not attempt to read or write these locations. pci arbiter priority control register 1 (default = e0h) type: read/write bit description : bits [7:5]: bank [3:1] rotate enable. defaults to 111b (enabled). bits [4:3]: bank 4 fixed mode priority select. bit 4 3 function 0 0 ide ? > bk1 ? > bk2 ? > bk3 0 1 bk1 ? > bk2 ? > bk3 ? > ide 1 0 bk2 ? > bk3 ? > ide ? > bk1 1 1 bk3 ? > ide ? > bk1 ? > bk2 bits [2:0]: bank [3:1] fixed mode priority select. if 0 upper ones will be chosen, ideirq# priority always higher than req4#
w83c553f electrical specifications winbond systems laboratory 76 pci arbiter priority extension control register (default = 01h) type: read/write bit description : bits [7:4]: reserved bits [3:1]: super agent select [2:0]. 000 disable 100 req0# 001 ideirq# 101 req1# 010 sioirq# 110 req2# 011 cpureq# 111 req3# bits 0: bank 4 rotate enable. defaults to 1b (enabled). pci arbiter priority enhanced control register (default = 00h) type: read/write bit description : bits [7:6]: bank 4 programmable slot 3 select [1:0]. bits [5:4]: bank 4 programmable slot 2 select [1:0]. bits [3:2]: bank 4 programmable sl ot 1 select [1:0]. bits [1:0]: bank 4 programmable slot 0 select [1:0]. pci arbiter priority extension control register index: 81h bit [7:4] [3:1] 0 bnk4 rotary enable sagent select [2:0] reserved
w83c553f electrical specifications winbond systems laboratory 77 pci arbiter control register (default = 80h) type: read/write bit description : bit 7: gat. guaranteed access timing. if set to a 1b, this bit enables function 0 flush reque st and flush acknowledge operation on pins 6 and 7 (provided pin 13 is not pulled low after reset). this bit defaults to a 1b. bit [6:5]: reserved. bits [4:3]: arbiter timeout timer value [2:0] number of clocks to wait for frame# to asset after gnt# is a sserted 00 ato time out after 16 clocks 01 ato time out after 4 clocks 10 ato time out after 8 clocks 11 ato time out after 32 clocks bit 2: arbiter timeout timer enable. bit 1: cpu park enable. otherwise the arbiter will park on the last master. 0=enabl e. bit 0: bus lock enable. if set to 1b, this bit converts a pci lock cycle to a bus lock. if this bit is 0b, the pci arbiter ignores the lock# signal on the pci bus.
w83c553f electrical specifications winbond systems laboratory 78 4.2 isa bridge (function 0) i/o registers 4.2.1 dma controller i/o registers base and current address register type: read/write bit description : bits [15:0]: base and current address. access by two consecutive cycles. internal high/low byte pointer toggles after each access. base and current word count register type: read/write bit description : bits [15:0]: base and current word count. access by two consecutive cycles. internal high/low byte pointer toggles after each access.
w83c553f electrical specifications winbond systems laboratory 79 dma command register (default = 00h) type: write only bit description : bit 7: reserved. bit 6: drq active level. when this bit is "0" (default), drq is active high. when this bit is "1," drq is active low. bit 5: reserved. extended/late write select. must be "0". bit 4: priority scheme. 0 = fixed. 1 = rotating. bit 3: reserved. compressed timing. must be "0". bit 2: controller enable. (0=enable; 1=disable) bits [1:0]: reserved. memory-to-memory transfer control. must be "0".
w83c553f electrical specifications winbond systems laboratory 80 dma controller 1 status register (default = 00h) type: read only bit description : bit 7: channel 3 request. bit 6: channel 2 request. bit 5: channel 1 request. bit 4: channel 0 request. bit 3: channel 3 terminal count. bit 2: channel 2 terminal count. bit 1: channel 1 terminal count. bit 0: channel 0 terminal count.
w83c553f electrical specifications winbond systems laboratory 81 dma controller 2 status register type: read only bit description : bit 7: channel 7 request. bit 6: channel 6 request. bit 5: channel 5 request. bit 4: reserved. cascade for dma controller 1. bit 3: channel 7 terminal count. bit 2: channel 6 terminal count. bit 1: channel 5 terminal count. bit 0: reserved. cascade for dma controller 1.
w83c553f electrical specifications winbond systems laboratory 82 dma controller request register type: write only bit description : bits [7:3]: reserved. bit 2: set request. bits [1:0]: channel select. dma controller mask register type: write only bit description: bits [7:3]: reserved. bit 2: setmask. set mas k bit. bits [1:0]: csel [1:0]. channel select bits.
w83c553f electrical specifications winbond systems laboratory 83 dma controller mode register type: write only bit description : bits [7:6]: transfer mode. bit 7 bit 6 0 0 = demand mode 0 1 = single mode 1 0 = block mode 1 1 = cascade mode bit 5: decrement a ddress. when set to "1", address pointer is decremented after each transfer. default is incrementing address. bit 4: auto initialize enable. bits [3:2]: transfer type. bit 3 bit 2 0 0 = verify 0 1 = write 1 0 = read 1 1 = illegal type bits [1:0]: channel select.
w83c553f electrical specifications winbond systems laboratory 84 clear byte pointer register type: write only bit description : bits [7:0]: clear byte pointer. writing any pattern in this register will reset the byte pointer for the base and current address/data registers. master clear register type: write only bit description : bits [7:0]: master clear. writing any pattern in this register will initialize the dma controller to the same state as in a hardware reset.
w83c553f electrical specifications winbond systems laboratory 85 clear mask register type: write only bit description : bits [7:0]: r eserved. writing this register will clear the mask bits of all channels. write all mask register (default = 0fh) type: write only bit description : bits [7:4]: reserved. bit 3: channel 3 bit 2: channel 2 bit 1: channel 1 bit 0: channel 0 0 enable, 1 mask
w83c553f electrical specifications winbond systems laboratory 86 memory page register (default = 00h) type: read/write bit description : bits [7:0]: memory address [23:16] for dma cycles. reserved page register bit description: bits [7:0]: reserved. software should not attempt to access these r egisters.
w83c553f electrical specifications winbond systems laboratory 87 extended mode register (default = 0xh) type: write only bit description : bits [7:6]: reserved. bits [5:4]: timing. bit 5 bit 4 0 0 compatible timing 0 1 a 1 0 b 1 1 f note: ior# is 1 bclk wide for io to memory dma note : iow# is 3-5bclk wide for memory to io dma bits [3:2]: reserved. bits [1:0] dmac[1:0] channel select. dmac1 dmac2 bit 1 bit 0 channel select channel select 0 0 0 reserved 0 1 1 5 1 0 2 6 1 1 3 7 dma page registers (default = 00h) type: read/wri te bit description: bits [7:0]: ad[31:24].
w83c553f electrical specifications winbond systems laboratory 88
w83c553f electrical specifications winbond systems laboratory 89 scatter/gather registers scatter/gather (s/g) provides the capability of transferring multiple buffers between memory (isa/pci) and i/o (isa dma device) without cpu intervention. in scatter/gather the dma can read the memory address and word count from an array of buffer descriptors located in system memory (pci only), called the scatter/gather descriptor (scd) table. this allows the dma controller to sustain dma transfers until all of the buffers in the sgd table are transferred. software prepares a sgd table in system memory. each sgd is 8-bytes long and consists of an address pointer to the starting address and the byte count (number of bytes) of the memory buffer to be transferred. in any given sgd table, two consecutive sgds are offset by 8-bytes and are aligned on a 4-byte boundary. each sgd is defined below. for an 8-bit dma i/o device: for a 16-bit dma i/o device, bit 0 of the memory buffer starting address and byte count must be 0. bit 31 of dword 1 is the end of link flag. bus master operation terminates upon completion of the description entry that has eol set. the sgd table cannot cross a 64k memory boundary. the addresses of all of the registers located from 43fh to 40ah (except 40bh) are relocatable by programming the scatter/gather relocation base address register (function 0, address 41h) in the pci configuration space. these registers are marked with an asterisk (*).
w83c553f electrical specifications winbond systems laboratory 90 scatter/gather interrupt status register (default = 00h) type: read only bit description: bits [7:5]: channel [7:5] interrupt status. when one of these bits is set to a 1b, channels 7 through 5 have an interrupt due to a scatter/gather transfer; otherwise these bits are set to 0b. bit [4] reserved bits [3:0]: channel [3:0] interrupt status. when one of these bits is set to a 1b, channels 3 through 0 have an interrupt due to a scatter/gather transfer; otherwise these bits are set to 0b. scatter/gather interrupt status register i/o address: 40ah read bit [7:5 ] 4 [3:0] channel interrupt reserved channel interrupt
w83c553f electrical specifications winbond systems laboratory 91 scatter/gather command registers (default = 000000h) function: each of these three register s controls the scatter/gather operation of dma channels [7:5]. type : write only bit description: bit 7: ir13eopsel. irq13/eop select. if enabled via bit 6 of this register, bit 7 selects whet her eop or irq13 is asserted at termination caused by a last buffer expiring. if bit 7 = 1, eop is asserted; otherwise irq13 is asserted. bit 6: irq13eopen. irq13/eop programming enable. if bit 6 = 1, it enables irq13/eop programming and allows initialization or modification of the scatter/gather termination handling bits. bits [5:2]: reserved. must be 0. bits [1:0]: scatter/gather commands. bit 1 0 command 0 0 no scatter/gather operation. 0 1 start scatter/gather. 1 0 stop scatter/gather. this will halt a transfer immediately. 1 1 reserved.
w83c553f electrical specifications winbond systems laboratory 92 scatter/gather status registers type: read only bit description: bit 7: next_link_null. next link null indicator. bit 6: reserved. bit 5: issue_irq13_eop. issue irq13 on last buffer. when bit 5 = 0 , eop is issued on last buffer ; when bit 5 = 1, irq13 is issued. bit 4: reserved. bit 3: sg_base_req_full. scatter/gather base register status. when bit 3 = 0, the base register is empty; when bit 3 = 1, the base register has a buffer link loaded. bit 2: sg_cur_reg_full. scatter/gather current register status. when bit 2 = 0, the current register is empty; when bit 2 = 1, the current register has a buffer link loaded. bit 1: reserved. bit 0: sg_active. scatter/gather active. this bit indicates the current scatter/gather transfer status. bit 0 is set to 1 after a scatter/gather start command is issued. when bit 0 = 0, it means there is no scatter/gather operation.
w83c553f electrical specifications winbond systems laboratory 93 scatter/gather descriptor table pointer register type: read/write bit description: bits [31:0]: sg_tbl_ptr. the scatter/gather descriptor table pointer register contains a 32-bit pointer address to the main memory location where the software maintains the scatter/gather descriptors for the linked-list buffers. bits [31:0] correspond to a[31:0] on the pci ad bus.
w83c553f electrical specifications winbond systems laboratory 94 4.2.2 programmable interrupt controller (pic) registers initialization command word 1 register (default = 19h) function : a write to the initialization command word 1 (icw1) register starts the interrupt controller initialization sequence. addresses 20h and a0h are referred to as the base address of interrupt controllers #1 and #2 respectively. an i/o write to the interrupt controller #1 or #2 base address, with bit 4 equal to "1," is interpreted as icw1. for w83c553f based isa systems, three i/o writes to "base address +1" must follow the icw1 to perform writes to icw2, icw3 and icw4. type : write only bit description : bits [7:5]: reserved. these bits are not needed by the w83c553f and should be "000" while programming. bit 4: icw1sel. this bit must be a "1" to select icw1. after the fixed initialization sequence to icw1, icw2, icw3 and icw4, the controller base address is used to write to ocw2 and ocw3. bit 4 is "0" on writes to these registers. bit 3: ltim. this bit is always ignored and read as a "1." bit 2: reserved (adi). this bit is ignored by the w83c553f. bit 1: sngl. thi s bit must be programmed to a "0," indicating the two interrupt controllers are operating in cascade mode. bit 0: ic4. icsw4 write required. this bit must be set to a "1," indicating the icw4 needs to be programmed (that is, the controllers are operating in an x86 type system).
w83c553f electrical specifications winbond systems laboratory 95 operational control word 2 register function : the operational control word 2 (ocw2) register controls both the rotate mode, end of interrupt mode and combinations of the two. type : write only bit description : bits [7:5]: rot, sellevel and eoi. these three bits control the rotate, end of interrupt (eoi) modes and combinations of the two, as shown below: bit 7 bit 6 bit 5 mode 0 0 0 rotate in automatic eoi mode (clear). 0 0 1 non-specific eoi command 0 1 0 no opera tion 0 1 1 specific eoi command 1 0 0 rotate in automatic eoi mode (set) 1 0 1 rotate on non-specific eoi command 1 1 0 *set priority command 1 1 1 *rotate on specific eoi command *level 0 - level 2 are used (bits [2:0]) bits [4:3]: ocw2sel[1:0]. ocw2 selects. when selecting ocw2, these bits must be "00." if bit 4 is "1," the interrupt controller interprets the write to this port as an icw1. bits [2:0]: level[2:0]. these bits determine the interrupt level acted upon when the sc bit (6) is active, as shown below. bit 2 bit 1 bit 0 interrupt level 0 0 0 irq0 (8) 0 0 1 irq1 (9) 0 1 0 irq2 (10) 0 1 1 irq3 (11) 1 0 0 irq4 (12) 1 0 1 irq5 (13) 1 1 0 irq6 (14) 1 1 1 irq7 (15)
w83c553f electrical specifications winbond systems laboratory 96 operational control word 3 register function : the operational control word 3 (ocw3) register serves three functions. it enables special mask mode and controls poll mode and irr/isr register read. type : read/write bit description : bit 7: reserved. this bit must be "0." bit 6: smm. special mask mode. if esmm and smm are both "1," the interrupt controller enters smm. if esmm is "1" and smm is "0," the interrupt controller is in normal mask mode. when esmm is "0," smm has no effect. bit 5: esmm. enable special mask mode. if esmm is "1," the smm bit is enabled to set or reset special mask mode. if esmm is "0," the smm bit is a "don't care." bits [4:3]: ocw3sel[1:0]. ocw3 select. always ensure bit 4 is "0" and bit 3 is "1" when writing an ocw3. bit 2: polc. when this poll mode command bit is " 0," the poll command is not issured. when this bit is "1," the next i/o read to the interrupt controller is treated as an interrupt acknowledge cycle. bits [1:0]: regread and isrirr. these register read command bits provide control for reading the in-service register (isr) and interrupt request register (irr), as shown below. bit 1 bit 0 function 0 0 no action 0 1 no action 1 0 read irq register irr 1 1 read is register isr
w83c553f electrical specifications winbond systems laboratory 97 initialization command word 2 register function : the initializ ation command word 2 (icw2) register is used to initialize the interrupt controller with the five most significant bits of the interrupt vector address. the value programmed into bits [7:3] is used by the host cpu to define the base address in the interrupt vector table for the interrupt routines associated with each irq on the controller. type : write only bit description : bits [7:3]: ta[7:3]. interrupt vector base address. these bits define the base address in the interrupt vector table for the interrupt routines associated with each interrupt request level input. for interrupt controller #1, a typical value is "00001;" for interrupt controller #2, a typical value is "10000." bits [2:0]: reserved. interrupt request level. when writing icw2, these bits should all be "0." during an interrupt acknowledge cycle, these bits are coded with a simple binary value determining which irq is enable.
w83c553f electrical specifications winbond systems laboratory 98 initialization command word 3 register - pic 1 (master, default = 04h) function : on the interrupt co ntroller #1 (the master controller), this register indicates which irq line physically connects the int output of interrupt controller #2 (pic 2) to interrupt controller #1 (pic 1). type : write only bit description : bits [7:3]: slave[7:3]. these bits must be programmed to "00000." bit 2: slave2. cascaded interrupt controller irq connection. this bit must always be programmed to "1." it indicates the slave controller (#2) is cascaded on irq2. bits [1:0]: slave[1:0]. these bits must be programmed to "00." initialization command word 3 register - pic 2 (slave) function : on the interrupt controller #2 (the slave controller), this register contains the slave identification code broadcast by interrupt controller #1 from the trailing edge of the first inta# pulse to the trailing edge of the second inta# pulse. it must be programmed to 02h for interrupt controller #2. type : write only bit description : bits [7:3]: reserved. these bits must be programmed to "00000." bits [2:0]: slvid[2:0]. slave identification code. during the initialization sequence, bits 2 and 0 must be programmed to "0" and bit 1 programmed to a "1."
w83c553f electrical specifications winbond systems laboratory 99 initialization command word 4 register function : both interrupt controllers must have the initialization command word 4 (i cw4) register programmed as part of their initialization sequence. at a minimum, bit 0 must be set to "1" to indicate it is operating in an x86-based system. type : write only bit description : bits [7:5]: reserved. these bits must be programmed to "000. " bit 4: sfnm. special fully nested mode. this mode should normally be disabled by writing "0" to this bit. bit 3: buf. buffered mode. this bit must be programmed to "0" for the w83c553f. bit 2: mns. master/slave in buffered mode. this bit must be programmed to "0" for the w83c553f. bit 1: aeoi. automatic end of interrupt. this bit should normally be programmed to "0." if programmed to "1, " automatic end of interrupt mode is enabled. bit 0: upm. microprocessor mode. this bit must be set to "1" to indicate the interrupt controller is operating in an x86-based system.
w83c553f electrical specifications winbond systems laboratory 100 operational control word 1 register function : the operational control word 1 (ocw1) register sets and clears the mask bits in the interrupt mask (imr) register. each interrupt request line may be selectively masked or unmasked any time after initialization. type : read/write bit description : bits [7:0]: imr[7:0]. when a "1" is written to any bit in this register, the corresponding irqx line is masked. when a "0" is written to any bit in this register, the corresponding irqx mask bit is cleared and interrupt requests will again be accepted by the controller. note: masking irq2 on 21h will also mask interrupt requests from a1h, which is physically cascaded to irq2.
w83c553f electrical specifications winbond systems laboratory 101 interrupt edge/level control register (default = 00h) type: read/write bit description : bit 7: controller 1-channel 7. controller 2-channel 15. bit 6: controller 1-channel 6. controller 2-channel 14. bit 5: controller 1-channel 5. controller 2-channe l 13 ; must be "0" for edge. bit 4: controller 1-channel 4. controller 2-channel 12. bit 3: controller 1-channel 3. controller 2-channel 11. bit 2: controller 1-channel 2; must be "0" for edge. controller 2-channel 10. bit 1: controller 1-channel 1; mus t be "0" for edge. controller 2-channel 9. bit 0: controller 1-channel 0; must be "0" for edge. controller 2-channel 8 ; must be "0" for edge.
w83c553f electrical specifications winbond systems laboratory 102 4.2.3 counter/timer i/o registers counter register function : these three registers contain the actual counter values programmed into counters 0 through 2. the set values are determined by selections made in the timer control register (43h). type : read/write bit description: bits [7:0] c[15:8]/c[7:0]. upper and lower counter values.
w83c553f electrical specifications winbond systems laboratory 103 counter status register function : each counter's status byte can be read following a timer read back command, as programmed in the timer control register (43h). type : read back bit description : bit 7: out. count out status. this bit indicates the counter out pin state. when set to "1", the out pin of the counter is also a "1". when set to "0", the out pin of the counter is also a "0". bit 6: nullcount. bits [5:4]: r/w. read/write selection status. these bits reflect the read/write selection made through bits [5:4] of the control register. the binary codes returned, during the status read, match the codes used to program the counter read/write selection. bit 5 bit 4 functio n 0 0 counter latch command 0 1 r/w least significant byte (lsb) 1 0 r/w most significant byte (msb) 1 1 r/w lsb then msb bits [3:1]: m. the mode selection status bits return the counter mode programming. the binary code returned matches the code used to program the counter mode, as listed under the bit function above. bit 3 bit 2 bit 1 mode 0 0 0 0 0 0 1 1 x 1 0 2 x 1 1 3 1 0 0 4 1 0 1 5 bit 0: bcd. the countdown method is binary when this bit is "0", and binary coded decimal (bcd) when this bit is "1".
w83c553f electrical specifications winbond systems laboratory 104 timer control register function : the timer control register specifies the counter selection, operating mode, counter byte programming order and count value size, and whether the counter counts down in a 16-bit or binary coded decimal (bcd) format. after writing the control word, a new count can be written at any time. the new value will take effect according to the programmed mode. type : write only bit description : bits [7:6]: sc[1:0]. these bits select the counter the control word acts upon as shown below. bit 7 bit 6 function 0 0 counter 0 select 0 1 counter 1 select 1 0 counter 2 select 1 1 read back command bits [5:4]: rw[1:0]. these bits are the read/write control bits. actual counter programming is done through the counter i/o port (40h, 41h, 42h for counters 0, 1 and 2, respectively). bit 5 bit 4 function 0 0 counter latch command 0 1 r/w least significant byte (lsb) 1 0 r/w most significant byte (msb) 1 1 r/w lsb then msb bits [3:1]: m[2:0]. these bits select one of six possible modes of operation for the counter as shown below. bit 3 bit 2 bit 1 mode function 0 0 0 0 out signal on end of count (=0) 0 0 1 1 hardware retriggerable one shot x 1 0 2 rate generator (divide by n counter) x 1 1 3 square wave output 1 0 0 4 software triggered strobe 1 0 1 5 hardware triggered strobe bit 0: bcd. when this bit is "0", a binary countdown is used. the largest possible binary count is 2 16 . when this bit is "1", a binary coded decimal (bcd) count is used. the largest bcd count allowed is 10 4 .
w83c553f electrical specifications winbond systems laboratory 105 bios timer register (default = 00000000h) function : after a counter value is written into the lower 16 bits of this register, it will decrement to 0 with every bclk. type : default bit description : bits [31:16]: reserved. bits [15:0]: btmr. bios timer. when a counter in written into this field, the counter will be decremented by 1 every bclk until 0 is reached.
w83c553f electrical specifications winbond systems laboratory 106 4.2.4 miscellaneous i/o control registers nmi status and control (port b) register (default = 00h) type: read/write bit description : bit 7: serr# status. bit 6: iochk# status. bit 5: timer counter 2 output. bit 4: refresh cycle toggle. bit 3: iochk# nmi enable. bit 2: serr# nmi enable. bit 1: speaker data enable. bit 0: timer counter 2 enable. note: for bit 3 and bit 2, 1= enable; 0 = disable.
w83c553f electrical specifications winbond systems laboratory 107 nmi enable and rtc address register (default = 0xxx, xxxx) type : shadow bit description : bit 7: nmi enable. bits [6:0]: rtc address. share
w83c553f electrical specifications winbond systems laboratory 108 port 92 register (default = 24h) type: read/write bit description : bits [7:3]: reserved. these bits default to "00100." bit 2: read only. value of pin 116 after reset. see page 25. bit 1: alt a20. bit 0: hot reset. changing this bit from a 0 to 1 will cause a system soft reset to occur. this bit must be returned to 0 before another soft reset can be issued. co-processor error register type: write only bit description : bits [7:0]: co-processor error. this register only exists in x86 mode.
w83c553f electrical specifications winbond systems laboratory 109 rtc cmos ram protect 1 register type: write only bit description: bits [7:0]: any value. writing any value to this port sets a flip- flop which prevents any subsequent access to addresses 20h - 2fh of the real time clock address space. this flip-flop is cleared only on power-on reset. a read has no effect. this register's initial state after reset is in unprotected mode. this register only exists in powerpc mode. rtc cmos ram protect 2 register type: write only bit description: bits [7:0]: any value. writing any value to this port sets a flip- flop which prevents any subsequent access to addresses 30h - 3fh of the real time clock address space. this flip-flop is cleared only on power-on reset. a read has no effect. this register's initial state after reset is in unprotected mode. this register only exists in powerpc mode.
w83c553f electrical specifications winbond systems laboratory 110 4.3 pci configuration space - bus master ide registers (function 1) the configuration space is organized as 64 double word (32-bit) registers. it is divided into two sections, the pci specified and defined header registers and the control registers. header registers are located in the first 16 double words. control registers are located in the last 48 double words. table 4-1 . bus master ide configuration space header registers address register bits 31 24 23 16 15 8 7 0 03h-00h device id (0105h) vendor id (10adh) 07h-04h device status device control 0bh-08h base class (01h) sub-class (01h) programming interface revision id (05h) 0fh-och reserved (00h) header type (80h) latency timer cache line size 13h-10h base address 0; port 0 primary registers (ide_cs0#) 17h-14h base address 1; port 0 auxiliary registers (ide_cs1#) 1bh-18h base address 2; port 1 primary registers (ide_cs0#) 1fh-1ch base address 3; port 1 auxiliary registers (ide_cs1#) 23h-20h base address 4; bus master ide registers (for dma mode disk drives) 3bh-24h reserved (00000000h) 3fh-3ch max_lat (28h) min_gnt (02h) interrupt pin (01h) interrupt line
w83c553f electrical specifications winbond systems laboratory 111 table 4-2 . organization of ide control registers address register bits 31 24 23 16 15 8 7 0 43h-40h ide control/status register 47h-44h port 0 drive 0 control register 4bh-48h port 0 drive 1 control register 4fh-4ch port 1 drive 0 control register 53h-50h port 1 drive 1 control register 7bh-54h reserved (00000000h) 7fh-7ch reserved ffh-80h reserved (00000000h) all reserved bits and bytes return a logic 0 when read. all reserved bytes written will execute normal pci cycles, but will not affect the operation or device registers. internal register information for the w83c553f sio is organized as follows: ? register name and index value offset from base address. ? function of the signal. ? type (read and/or write) . ? bit description.
w83c553f electrical specifications winbond systems laboratory 112 4.3.1 function 1 header registers the registers contained in this address space are defined and required by the pci specification revision 2.1. six fields in the pre-defined header deal with device identification. these fields are vendor id, device id, revision id, header type, class code, and programming interface and their addresses are 00h-03h ,08h-0bh. vendor id register function : this field, containing the vendor id value 10adh, identifies symphony labs as the manufacturer of the device. this register is read only. type : read only device id register function : this field, the device id, will identify the bus master ide device with a value of 0105h (similar to the w83789f 'sonata' chip). type : read only
w83c553f electrical specifications winbond systems laboratory 113 device control register (default = 0000h) function : the device control register provides coarse control over the device's ability to generate and respond to i/o cycles. since the default value disables the io decode, it must be programmed by the bios/firmware to enable this function. type : read/write bit description : bit [15:9]: these bits are reserved and hardwired to a logic 0b. bit 8: serr. when this bit is 1b, the se rr# output driver is enabled. a system error will only be reported for address parity errors. bit 6 parity must also be enabled, or no error will be reported. bit 8 is a 0b after a reset. bit 7: this bit is not used and is hardwired to a logic 0b. bit 6: parity. this is the enable bit for the perr# output driver. when bit 6 is a 1b, slave write data parity errors, and master memory read data parity errors, will be reported on perr#. write data parity errors are only reported for bus cycles claimed by the w83c553f (devsel# asserted). bit 6 is a 0b after a reset. bit 5: this bit is not used and is hardwired to a logic 0b.
w83c553f electrical specifications winbond systems laboratory 114 bit 4: mwien. when this bit is 1b, memory write and invalidate commands are enabled, when acting as a bus master. when this bit is 0b, only memory writes can be used. this bit is a 0b after a reset. bit 3: this bit is not used and is hardwired to a logic 0. bit 2: bmen. this bit must be set to allow the w83c553f to perform bus master cycles. writing a 1b to this bit will set it. also, writing a 1b to bit 0 (start/stop bus master) of the primary or secondary bus master ide command register will set this bit. this bit is a 0b after a reset. bit 1: this bit is not used and is hardwired to a logic 0b. bit 0: ioen. when bit 0 is set to a 1b, ide i/o address decodes, based on the w83c553f's configuration, are enabled. primary and/or secondary port i/o addresses are decoded if they are also enabled in the ide control/status register. they will be the default address range, unless the base address registers are enabled and programmed. in this case, the base address registers determine the addresses to be decoded.
w83c553f electrical specifications winbond systems laboratory 115 device status register (default = 0280h) function : the device status register is used to record status information for pci bus related events. reads to this register behave normally. writes report slightly different, in that bits can be reset, but not set. a bit is reset whenever the register is written, and the data in the corresponding bit is a 1b. in the cases of pe, se, ma, rta, ta, or mpe been set, the software should write a ? 1 ? in the corresponding bit position to clear it, after recovering from the error. type : read/write bit description : bit 15: pe. this bit is set anytime a parity error is detected durin g a slave data write to the w83c553f , for any command phase parity error, or when operating as a bus master for any memory read parity error. the function of this bit is not affected by the device control register parity bit. bit 14: se. this bit is set anytime the w83c553f asserts the serr# output low. bit 13: ma. this bit will be set when operating as a bus master and a (memory) cycle is terminated with master abort. bit 12: rta. this bit will be set when operating as a bus master and a (memor y) cycle is terminated with target abort. bit 11: ta. the target abort bit will be set anytime the w83c553f terminates a slave cycle with a target abort cycle.
w83c553f electrical specifications winbond systems laboratory 116 bit [10:9] dstmg. these bits encode the timing of devsel#. they are hardwired to 01b indicating the support of medium devsel# timing. this allows for support of fast back-to-back pci bus cycles. this will maximize the pci bus bandwidth for pio data transfer cycles. bit 8: mpe. this bit will be set when operating as a bus master and eithe r the perr# output is driven low by the w83c553f or the target asserts perr# and bit 6 of the device control register is set. bit 7: fbb. this bit will always be set. the w83c553f fully supports fast back to back transactions to different targets. bit [6:0]: these bits are reserved and are hardwired to logic 0b.
w83c553f electrical specifications winbond systems laboratory 117 revision id register (default = 05h) function : this register specifies a device specific revision identifier. the first symphony bus master device was 01h with subsequent bus master ide chips being 02h, 03h, etc. this specification is written to define device revision 05h. type : read only
w83c553f electrical specifications winbond systems laboratory 118 programming interface register ( default = 8ah) function : there are no pci predefined configuration register sets released for t his class of device but the pci sig has generated two proposed interfaces which are both supported. the first interface defines native and legacy ide devices and is described in pci rev. 2.1 spec. the programming interface register will support both the native and legacy modes. also the pci sig group has proposed a programming interface for bus master ide controllers. this register set and protocol is fully supported as indicated by bit 7 of this register being set. type : read/write bit description : bit 7: bus master. this bit is hardwired to logic 1 to indicate support of the ide bus master register set and protocol. bit [6:4]: these bits are reserved and hardwired to logic 0. bit 3: p1prog. port 1 programmable is hardwired to a 1b. this indicates t hat bit 2 of this register is r/w. bit 2: if this bit is 1b, indicating in native mode, base address register (2 and 3) can be programmed. if it is 0b, indicating legacy mode, they can not be programmed and default address will be used. bit 1: p0prog. po rt 0 programmable is hardwired to a 1b. this indicates that bit 0 of this register is r/w. bit 0: if this bit is 1b, indicating in native mode, base address register (0 and 1) can be programmed. if it is 0b, indicating legacy mode, they can not be programmed and default address will be used.
w83c553f electrical specifications winbond systems laboratory 119 pci base and sub class register (default = 0101h) type: read only bit description : bits [15:8]: sub class. permanently defaults to 01h - ? ide controller. ? bits [7:0]: base class. permanently defaults to 01 h - ? mass storage controller. ? cache line size register (default = 08h) function : this 8-bit register is programmed by the host to the cache line size being used by the system processor. it is programmed in units of 32-bit double words. the programmed value effects the memory read and write commands executed when the w83c553f is operating as a bus master. the default value is 08h. this register can only be programmed to 04h (16 bytes), 08h (32 bytes), or 00h (4 bytes); all other values will be ignored. type : read/write
w83c553f electrical specifications winbond systems laboratory 120 latency timer register (default = 00h) function : this register specifies, in pci bus clocks, the value of the latency timer when operating as a bus master. bits 0 through 2 are hardwired to a 0b. bits 3 through 7 are programmable allowing a programmable latency value in increments of 8 pci clocks. the result is a timer granularity of eight clocks. this register has a default value of 00h. type : read/write bit description : bit [7:3] high-order timer bits. five pr ogrammable timer value bits. bit [2:0] low-order timer bits. hardwire to ground for read-only 0b values. header type register (default = 80h) type: read only bit description : bits [7:0]: this byte identifies the layout of bytes 10h through 3fh in the configuration space. a default value of 80h specifies the class codes shown in table 6-1 of the pci specification.
w83c553f electrical specifications winbond systems laboratory 121 base address registers 0 through 3 (10h-13h, 14h-17h, 18h-1bh, 1ch-1fh) the w83c553f can be configured to support these base address registers or to disable them. this can be useful in configuring the device to operate in pci systems that have various levels of configuration compatibility. base address registers 0 and 1 are used to control the primary ide port i/o address locations. base address registers 2 and 3 are used to control the secondary ide port i/o address locations. ior[a:b]# and iow[a:b]# are used with idecs0# and idecs1# to access the primary and second ports. note: a base address register does not contain a valid address when it is equal to "0". table 4-3 . base address register mapping base address register address decode ide chip select default when enabled value when programmed ff ff ff ffh 0 1f0h-1f7h ide_cs0# 00 00 01 f1h ff ff ff f9h 1 3f6h ide_cs1# 00 00 03 f5h ff ff ff fdh 2 170h-177h ide_cs0# 00 00 01 71h ff ff ff f9h 3 376h ide_cs 1# 00 00 03 75h ff ff ff fdh when p0n/l# bit in programming interface register is set, base address register 0,1 can be programmed for relocation to any address within the 32 bit pci i/o address space. when p1n/l# bit in programming interface register is set, base address register 2,3 can be programmed for relocation to any address within the 32 bit pci i/o address space. the default values of all the registers are located above. when relocating the ide ports, the normal procedure is to first program the base address register with a value of ff ff ff ffh. next the register is read. base address registers 0 and 2 will respond with a value of ff ff ff f9h indicating a decode range of 8 bytes in i/o space, while 1 and 3 will respond with a value of ff ff ff fdh indicating a decode range of 4 bytes in i/o space. although base address registers 1 and 3 indicate a decode of 4 bytes, they will only claim cycles to byte lane 2 (of 0 through 3) of the 4 byte range. this means that register accesses to 3f4h, 3f5h, 3f7h, 374h, 375h or 377h (or the equivalent offset) will not be claimed or executed. the w83c553f will only decode ide port addresses if the ioen bit of the device control register is high and the ide port is enabled in the w83c553f function 1: ide control/status registers.
w83c553f electrical specifications winbond systems laboratory 122 base address register 4 (20h-23h) this base address register is used to define the i/o address of the bus master ide register set in systems which use multi- word dma mode disk drives . this register set is internal to the w83c553f but is located in the i/o address space instead of the configuration address space. the default value of base address register 4 is 00000001h. when programmed with a value of ffffffffh, a value of fffffff1h will be read back indicating a required address range of 16 bytes. the bus master ide register set can be located anywhere in the 32 bit i/o address space. since address 00 00 00 00h is the address of the motherboard dma controller, no cycles will be claimed until base address register 4 is programmed to a non-zero address and ioen is set in the device control register. the lower 4 bits are hardwired to a value of 1h. note: a base address register does not contain a valid address when it is equal to "0". interrupt line register (3ch) the interrupt line register is an 8-bit register used to communicate interrupt line routing information. this register is read/write. the post software is expected to write the appropriate routing information into this register as it initializes and configures the system. at reset, this register is set to 0eh to indicate the desired interrupt path to the interrupt controller is through irq14. interrupt pin register (3dh) the interrupt pin register is an 8-bit register that defines which interrupt pin the device uses. a value of 01h is hardwired to this register to signify that inta# is being used. this interrupt may be a pci interrupt or an isa interrupt (i.e. irq14).
w83c553f electrical specifications winbond systems laboratory 123 min. grant (3eh) and max. latency (3fh) registers these read-only registers specify the desired latency timer value. they each represent a number of 1 /4 microsecond time units. the min grant is the time required to complete a worst case burst assuming a 33mhz pci clock. the hard coded value is 02h which represents 0.5s. the max latency specifies how often the w83c553f needs to gain control of the pci bus. the hard coded value is 28h which represents 10s.
w83c553f electrical specifications winbond systems laboratory 124 4.3.2 function 1 control registers these configuration registers control various features of the w83c553f and the ide interface. reserved registers are hardwired to a 00h and cannot be programmed. the first register controls the general features of the w83c553f and both ide ports. the next four registers control the features and timing of the 4 individual ide devices. all features of the ide interface that have no effect on the performance of the mass storage subsystem have been set to fixed values in hardware (i.e.; all 8-bit timing).
w83c553f electrical specifications winbond systems laboratory 125 ide control/status register function : this register controls the two ide ports of the w83c553f. type : read/write
w83c553f electrical specifications winbond systems laboratory 126 bit description : bit 31: reserved. this bit is hardwired to 0b. bit 30: ide_irqb. this is th e ide_irqb input signal. it reflects the unbuffered state of the ide_irqb input. bit 29: reserved. this bit is hardwired to 0b. bit 28: ide_irqa. this is the ide_irqa input signal. it reflects the unbuffered state of the ide_irqa input. bit 27: reserve d. this bit is hardwired to 0b. bits [26:16]: ra[10:0]. these bits control the read-ahead duration for the ide interface. read-ahead duration is defined as the number of 16-bit ide data reads that will be prefetched independent of any pci bus cycles. the actual read ahead count will equal the programmed value plus one cycle. the default value is 0ffh (255 decimal + 1) for 256 16-bit ide cycles (512 bytes). bits [15:12] : reserved. these bits are hardwired to 0000b. bit 11: legirq. this bit and bit 2 o f the programming interface register control the interrupt destination for both the ide ports , in association with function 0 ide_interrupt_routing_control _register (43h) . the default value of function 0, ide interrupt routing control register is efh, indicating primary port interrupt goes to irq 14, and secondary interrupt goes to irq15. when legirq=1, for using legacy interrupts, the function 0 ide_interrupt_routing control register should be programmed to value 0, indicating legacy interrupt internal routing to intc# and/or intd# are desired, as shown below. the default state is 0b. legirq p1n/l# ideirqa ideirqb 0 x irq14 irq15 1 0 intc# intd# 1 1 intc# intc# bit [10:8]: reserved. these bits are hardwired to 0b. bit 7: reserved. bit 6: reserved. this bit is hardwired to 0b. bit 5: p1f16. port 1 fast 16 controls the operation of port 1 (secondary port) when executing 16 bit pio cycles on the pci bus. when reset (0b), all 16 bit cycles to port 1 will operate using the default 8-bit timing (mode 0 compatible). also, posted writes, read ahead and ide_iochrdy will be disabled for 16-bit cycles. when set to 1b, 16-bit cycles will operate using the programmed speed setting, while posted writes, read ahead, and ide_iochrdy will be supported as programmed in the applicable port x drive x control register. bit 5 is cleared to a 0b after reset or if the secondary port receives a soft reset, defined as any time the secondary port device control register (default address 376h) is written with bit 2 a 1b. bit 4: p1en. this is the secondary port enable bit. when set and ioen is set in the control register, i/o cycles to the secondary port will be claimed and executed. when 0b or ioen is 0b, all secondary port cycles will be ignored. the default value of this bit is "1." bit [3:2]: reserved. these bits are hardwired to 0b. bit 1: p0f16. port 0 fast 16 functions the same as bit 5, but for port 0 (primary port). similarly, this bit is cleared any time the primary port device control register (default address 3f6h) is written with bit 2 a 1b. bit 0: p0en. this is the primary port enable bit. when set and ioen in the control register is enabled, i/o cycles to the primary port will be claimed and executed. when 0b or ioen is 0b, all primary port cycles will be ignored. the default value of this bit is 1b.
w83c553f electrical specifications winbond systems laboratory 127 port x drive x control registers function : these registers control the features of the four devices connected to the two ports. all four registers are identical and control the features of only one device. the port 0 drive 0 control register (44h-47h) controls the features of the master drive attached to the primary port. the port 0 drive 1 control register (48h-4bh) controls the features of the slave drive attached to the primary port. the port 1 drive 0 control register (4ch-4fh) controls the features of the master drive attached to the secondary port. the port 1 drive 1 control register (50h-53h) controls the features of the slave drive attached to the secondary port. the command timing controls only affect 16-bit and 32-bit accesses. calculations (refer to table 4-4): cmd on time programmed value = (dior#/diow# 16-bit min+29) / 30ns clock - 1, after removing all digits to the right of the decimal point (see table 4-4). cmd off time programmed value = ((cycle time minimum ? (cmd on time programmed value + 1) * 30ns + 29)) / 30ns clock -1, after removing all digits to the right of the decimal point (see table 4-4). cmd on time = bits [12:8] of port x control x registers , which are the registers of configuration space 44h-54h. cmd off time = bits [4:0] of port x control x registers , which are the registers of configuration space 44h-54h.
w83c553f electrical specifications winbond systems laboratory 128 type : read/write bit description : bits [31:24]: reserved. these bits are hardwired to a 0b. bits [23:16]: user defined. these bits are read/write and do not affect the operation of the w83c553f . they can be used by the driver as a temporary storage. these bits will be 0b after reset. bits [15:13]: reserved. these bits are hardwired to a 0b. bits [12:8]: cmd on time. the value programmed to these bits controls the ide_ior# and ide_iow# "on" (low) time in clock cycles for this device. the actual number of clocks is the value programmed plus one clock. the default value is 9h or 10 clocks. this value affects both pio and dma timing. bit 7: pwen. posted write enable must be set to execute posted writes for this device. when this bit is a 1b, posted writes are enabled. when this bit is a 0b, the default state, posted writes are disabled. bit 6: r dyen. when set, the ide_iochrdy signal from the ide interface is enabled and can insert wait states when this device is accessed. when 0, the ide_iochrdy signal will have no effect on accesses to this device. this bit will be 0b after a reset. bit 5: raen. read-ahead enable must be enabled to execute read-ahead for this device. when this bit is a 1b, read-ahead is enabled. when this bit is a 0b, the default state, read-ahead is disabled. bits [4:0]: cmd off time. the value programmed to these bits controls the ide_ior# and ide_iow# "off" (high) time in clock cycles for this device. the actual number of clocks is the value programmed plus one clock. the default value is 9h or 10 clocks. this value affects both pio and dma timing.
w83c553f electrical specifications winbond systems laboratory 129 table 4-4. programming cmd on and cmd off times ( for 33 mhz pci bus clock) drive operation mode cycle time / dior#/diow# 16-bit (minimum) cmd on time clocks (programmed/actual) cmd off time clocks (programmed/actual) pio mode 0 600ns/165ns 5/6 13/14 pio mode 1 383ns/125ns 4/5 7/8 pio mode 2 240ns/100ns 3/4 4/5 pio mode 3 180ns/80ns 2/3 2/3 pio mode 4 120ns/70ns 2/3 0/1 pio mode 5 (proposed) 90ns/50ns 1/2 0/1 single word dma mode 0 960ns/480ns 15/16 15/16 multiword dma mode 0 480ns/215ns 7/8 7/8 multiword dma mode 1 150ns/80ns 2/3 1/2 multiword dma mode 2 120ns/70ns 2/3 0/1 multiword dma mode 3 (proposed) 90ns/50ns 1/2 0/1
w83c553f electrical specifications winbond systems laboratory 130 4.4 bus master ide (function 1) i/o registers the bus master ide register set is defined by the pci sig. it is composed of 16 8-bit registers and is located at the i/o address specified by base address register 4. the registers can be accessed 8, 16, 24, or 32 bits at a time. this register set is supplied to offer a higher performance lower overhead ide disk protocol. with this protocol, the host (pci) transfers will be bus master cycles and the ide device transfers will be dma. the normal pio protocol uses i/o transfers on both the host and ide interfaces. primary and secondary refer to the primary and secondary ide ports. both register sets are identical. table 4-5 . bus master ide i/o register organization offset from register bits base address 31 24 23 16 15 8 7 0 03h - 00h reserved primary status register reserved primary command register 07h - 04h primary prd table address 0bh - 08h reserved secondary status register reserved secondary command register 0fh - 0ch secondary prd table address note: the registers shown in table 4-5 cannot be accessed until after base address register 4 is written (with any non zero value).
w83c553f electrical specifications winbond systems laboratory 131 4.4.1 primary/secondary command registers primary/secondary command #1 registers function : these reg isters are used to control dma data transfers to/from the two ide ports when multi-word dma disk drives are used. type : read/write bit description : bits [7:4]: these bits are hardwired to 0b. bit 3: w/r#. this bit controls the bus master transfer directi on. low is pci memory to ide device and high is ide device to pci memory. this bit must not be changed while the bus master function is active as defined by bit 0. bits [2:1]: these bits are hardwired to 0b. bit 0: bmen. bus master operation is active when this bit is set. the bus master operation can be terminated by writing a 0b to this bit but is considered as an abort and can not be resumed. writing a 1b to this bit will also set the bmen bit in the device control register.
w83c553f electrical specifications winbond systems laboratory 132 4.4.2 primary/secondar y status registers primary/secondary status #1 registers (default = 00h) function : these register descriptions are the same and are used to control the two ide ports under the protocol, which requires a multi-word dma-capable disk drive in order for the w83c553f to function as a pci master. type : read/write bit description : bit 7: mt. the multithread bit is hardwired to a 0b to indicate that both channels operate independently and can be used at the same time. bit 6: sdc. slave drive dma capable is a status bit that is set by a driver/program to indicate that the slave drive on the indicated port is dma capable and that the w83c553f . is initialized for optimal performance. this bit is a 0b after a reset. bit 5: mdc. master drive dma capable is a status bit that is set by a driver/application to indicate that the master drive on the indicated port is dma capable and that the w83c553f . is initialized for optimal performance. this bit is a 0b after a reset. bit [4:3]: these bits are hardwired to a 0b. bit 2: irq. this bit is set by the rising edge of the associated ports ide_irq signal. this bit is cleared by writing a 1b to it. on data transfers from an ide device to system memory, this bit will be delayed until all data has been transferred to memory. this bit is a 0b after a reset. a noise filter has been added to the ide_irq inputs. bit 1: err. this bit is set when the controller encounters a n error when transferring data to/from system memory. the specific error conditions are errors that would cause bit 8, 12, or 13 of the device status register to become set. this bit is reset by writing a 1b to it. this bit is a 0b after a reset. bit 0: act. this bit is set when the start bit of the command register is written with a 1b. it is cleared when the start bit is written with a 0b (abort condition) or when the last transfer for a region is performed where eot is set in that region descriptor (normal termination).
w83c553f electrical specifications winbond systems laboratory 133 4.4.3 primary/secondary prd table (base address register 4 value + offset: 07h-04h, 0fh-0ch) these registers contain the starting address of the first physical region descriptor table in memory which applies to cases where the w83c553f is functioning as a pci bus master with one or more multi-word dma mode disk drives. bits 31 through 2 define a double word aligned address in memory. bits 1 and 0 are reserved and will be ignored on writes and read as 00b. the information in the descriptor table controls where the data is transferred to/from in system memory, how much data is transferred and when the transfer is complete. the descriptor table is composed of one or more physical region descriptors. each entry is two double words (8 bytes) and is defined below. table 4-6 . physical region descriptor data bits dword 31 16 15 0 0 memory region physical base address (31:2) 00 1 eot reserved byte count the memory region physical base address specifies a word aligned address in memory that the bus master will transfer data to/from. the byte count specifies the number of bytes of data to transfer to this region of memory. the byte count is required to be even (d0=0b). the maximum number of bytes defined in one descriptor entry is 64k which is selected by a value of 00h. the number of bytes specified must not cause the memory region specified to cross a 64k boundary. bit 31 of double word 1 is the end of table flag. bus master operation terminates upon completion of the descriptor entry that has eot set. the physical region descriptor table cannot cross a 64k memory boundary.
w83c553f electrical specifications winbond systems laboratory 134 5.0 electrical spec ifications this section contains all electrical specifications for winbond systems laboratory w83c553f sio chip. the w83c553f must meet all absolute maximum ratings to avoid being damaged; and all combinations of the ac, dc and recommended operating specifications. table 5.1. absolute maximum ratings parameter values min max notes storage temperature -40c 125c supply voltage ( vdd) -0.5v 7.0v input voltage -0.5v vdd +0.5v output voltage -0.5v vdd +0.5v table 5-2 . recommended operating ranges parameter values min max notes v dd dc supply voltage 4.75v 5.25v v in input voltage v ss v dd operating temperature 0 +70c
w83c553f electrical specifications winbond systems laboratory 135 table 5.3. dc characteristics (ta=0c to 70c, vdd=5v+/-5%) parameter values min max notes input low level - 0.8v ttl. 0.5v typical input high level 5.5v ttl. 2.0v typical output low voltage: 4ma buffer, iol=4ma 8ma buffer, iol=8ma 12ma buffer, iol=12ma 16ma buffer, iol=16ma 0.4v 0.4v 0.4v 0.4v 0.15v typical 0.18v typical 0.18v typical 0.17v typical output high voltage: 4ma buffer, iol=4ma 8ma buffer, iol=8ma 12ma buffer, iol=12ma 16ma buffer, iol=16ma 3.0v - 3.0v - 3.0v - 3.0v - 4.54v typical 4.44v typical 4.46v typical 4.46v typical input low current with 50k pullup resistor -10ua - -250ua -20ua -0.01ua typical -80ua typical input high current - 10ua 0.01ua typical tristate output off current low -10ua - -0.01ua typical tristate output off current high - 10ua 0.01ua typical input capacitance** - - 10pf typical output capacitance** - - 10pf typical i/o capacitance** - - 10pf typical * typical is under the condition of vdd=5.0+/-5% and ta=25 degree c. ** capacitance includes the capacitance of i/o cell plus package pin.
w83c553f timing diagrams winbond systems laboratory 136 6.0 timing diagrams this chapter lists the following pci, ata, and isa timing information: ? pci clock timing ? pci bus timing ? ide interface timing ? ide data transfer timing ? miscellaneous tim ing ? example pio ata data transfer timing ? example single word dma ata data transfer timing ? example multiword dma ata data transfer timing ? isa bus timing
w83c553f timing diagrams winbond systems laboratory 137 6.1 pci timing diagrams this section provides timing information on pci cycles supported by the w83c553f. table 6-1. pci clock timing note : for 5v pci bus, measurements were taken from 0.4v to 2.4v. all v dd are 4.75v to 5.25v parameter values min max notes t1 clk cycle time 30ns the w83 c553 f will operate properly at any frequency between 0 and 33 mhz. t2 clk high time 11ns - t3 clk low time 11ns - t4 clk slew rate 1v/ns 4v/ns
w83c553f timing diagrams winbond systems laboratory 138 table 6-2. pci bus timing note : for 5v pci bus, measurements were taken from 0.4v to 2.4v. all v dd are 4.75v to 5.25v parameter values min max notes t5 setup to clk rising 7ns - all pci bussed signals, except req# and gnt#. t6 hold from clk rising 0ns - all pci bussed signals.
w83c553f timing diagrams winbond systems laboratory 139 table 6-2 (continued). pci bus timing parameter values min max notes t7 setup to clk rising 10ns - timing for gnt#. 12ns - timing for req#. t8 valid from clk rising 2ns 11ns all pci bussed signals, except req# and gnt#. 2ns 12ns timing for req# and gnt#. t9 float from clk rising - 28ns all pci bussed signals, except req# and gnt#.
w83c553f timing diagrams winbond systems laboratory 140 table 6-3. ide interface timing parameter values min max notes t11 address setup to command low 3 x t1 ns - t12 address hold from command high 30ns t13 ide_iochrdy high setup to c ommand high 0 .5 x t1 ns t14 read data setup to ide_ior# high 10ns t15 read data hold from ide_ior# high 0ns t16 write data setup to ide_iow# high t19ns t17 write data hold from ide_iow# high 30ns t18 command recovery time 8-bit cycle 300ns t18 command recovery time 16-bit cycle r2 x t1ns r2 is the 16-bit command recovery count in pci clocks (page 126) t19 command active time 8-bit cycle 300ns t19 command active time 16-bit cycle a2 x t1ns a2 is the 16-bit command active count in pci clocks (page 126)
w83c553f timing diagrams winbond systems laboratory 141 table 6-4. ide data transfer timing parameter values min max notes t20 idedrq[a:b] high to idedak[a:b]# low delay 0ns - t21 idedak[a:b]# setup to command low 0ns - t22 cs0#, cs1# setup to command low 3 x t1ns t23 idedak[a:b]#, cs0#, cs1# hold from command high t1ns
w83c553f timing diagrams winbond systems laboratory 142 table 6-5. miscellaneous timing parameter values min max notes t24 ideirq[a:b] high to int# low or i sa irq high - 50ns assumes that the interrupt path is enabled. it could be disabled or temporarily delayed due to read data in a fifo. t25 ideirq[a:b] low to int# float or isa irq low - 50ns t26 rst# low to ide_rst# low 30ns 50ns t27 rst# h igh to ide_rst# high - 50ns t28 idecs1# setup to rst# high 20ns - t29 idecs1# hold from rst# high. 0ns -
w83c553f timing diagrams winbond systems laboratory 143 6.2 ide/ata data transfers this information has been transferred from the ata-2 x3t9.2 specification for pio modes 0-3, multiword dma modes 0-1 and single-word dma modes 0-2. sff 8033 rev. 0.2 defines pio mode 4 and multiword dma mode 2. 6.2.1 example pio ata data transfer timing table 6-6. pio ata data transfer timing parameter values min max notes t0 cycle time mode 0 mode 1 mode 2 mode 3 mode 4 600ns 383ns 240ns 180ns 120ns t1 address valid to mode 0 ideior[a:b]# / ideiow[a:b]# mode 1 setup mode 2 mode 3 mode 4 70ns 50ns 30ns 30ns 25ns
w83c553f timing diagrams winbond systems laboratory 144 table 6-6 (continued). pio ata data transfer timing parameter values min max notes t2 ideior[a:b]# / ideiow[a:b]# mode 0 16-bit mode 1 mode 2 mode 3 mode 4 mode 5 165ns 125ns 100ns 80ns 70ns t0 is the minimum total cycle time, t2 is the minimum command active time, and t2i is the minimum command recovery time or command inactive time. the actual cycle time equals the sum of the actual command t2 pulse width 8-bit mode 0 mode 1 mode 2 mode 3 mode 4 mode 5 290ns 290ns 290ns 80ns 70ns active time and the actual command inactive time. the three timing requirements of t0, t2, t2i shall be met. the minimum total cycle time requir e ment, t0, is greater than the sum of t2 and t2i. this means host implementation t2i ideior[a:b]# / ideiow[a:b]# mode 0 recovery time mode 1 mode 2 mode 3 mode 4 mode 5 - - - 70ns 25ns can lengthen either or both t2 and t2i. to ensure that t0 is equal to the value reported in the devices identify drive data. a device implementation shall support any legal host implementation. t3 ideiow[a:b]# mode 0 data setup mode 1 mode 2 mode 3 mode 4 mode 5 60ns 45ns 30ns 30ns 20ns t4 ideiow[a:b]# data hold mode 0 mode 1 mode 2 mode 3 mode 4 mode 5 30ns 20ns 15ns 10ns 10ns
w83c553f timing diagrams winbond systems laboratory 145 table 6-6 (continued). pio ata data transfer timing parameter values min max notes t5 ideior[a:b]# data setup mode 0 mode 1 mode 2 mode 3 m ode 4 mode 5 50ns 35ns 20ns 20ns 20ns t6 ideior[a:b]# data hold mode 0 mode 1 mode 2 mode 3 mode 4 mode 5 5ns 5ns 5ns 5ns 5ns t6z ideior[a:b]# data mode 0 tri-state mode 1 mode 2 mode 3 mode 4 mode 5 - - - 3 0ns 30ns this parameter specifies the time from the negation edge of ideior[a:b]# to the time that the data bus is no longer driven by the device ( tri-state). t9 ideior[a:b]# / mode 0 ideiow[a:b]# mode 1 to address valid hold mode 2 mode 3 mod e 4 mode 5 20ns 15ns 10ns 10ns 5ns tr read data valid to mode 0 idechrdy active mode 1 mode 2 mode 3 mode 4 mode 5 - - - 0ns 0ns if ide_iochrdy is initially asserted after ta.
w83c553f timing diagrams winbond systems laboratory 146 6.2.2 example single word dma ata data tr ansfer timing table 6-7. single word dma ata data transfer timing parameter values min max notes t0 cycle time mode 0 mode 1 mode 2 mode 3 960ns 480ns 240ns tc idedak[a:b]# to mode 0 idedrq[a:b] delay mode 1 mode 2 mode 3 200ns 100ns 80ns td ideior[a:b]# / mode 0 ideiow[a:b]# mode 1 16-bit minimum mode 2 command active time mode 3 480ns 240ns 120ns te ideior[a:b]# mode 0 data access mode 1 mode 2 mode 3 250ns 150ns 60ns
w83c553f timing diagrams winbond systems laboratory 147 table 6-7 (continued). single word dma ata data transfer timing parameter values min max notes tf ideior[a:b]# mode 0 read data hold mode 1 mode 2 mode 3 5ns 5ns 5ns tg ideiow[a:b]# mode 0 write data setup mode 1 mode 2 mode 3 250ns 100ns 35ns th ideiow[ a:b]# mode 0 write data hold mode 1 mode 2 mode 3 50ns 30ns 20ns ti idedak[a:b]# to mode 0 ideior[a:b]# / mode 1 ideiow[a:b]# setup mode 2 mode 3 0ns 0ns 0ns tj ideior[a:b]# / mode 0 ideiow[a:b]# to mode 1 idedak[a:b]# hold mode 2 mode 3 0ns 0ns 0ns ts ideior[a:b]# read setup mode 0 mode 1 mode 2 mode 3 td-tens - td-tens - td-tens -
w83c553f timing diagrams winbond systems laboratory 148 6.2.3 example multiword dma ata data transfer timing table 6-8. multiword dma ata data transfer timing parameter values min max notes t0 cycle time mode 0 mode 1 mode 2 mode 3 480ns 150ns 120ns tc idedak[a:b]# to mode 0 idedrq[a:b] delay mo de 1 mode 2 mode 3 - - - td ideior[a:b]# / mode 0 ideiow[a:b]# mode 1 16-bit minimum mode 2 command active time mode 3 215ns 80ns 70ns
w83c553f timing diagrams winbond systems laboratory 149 table 6-8 (continued). multiword dma ata data transfer timing parameter values min max notes te ideior[a:b]# mode 0 data access mode 1 mode 2 mode 3 150ns 60ns - tf ideior[a:b]# mode 0 read data hold mode 1 mode 2 mode 3 5ns 5ns 5ns * * the meaning of this parameter in ata is not clear. the parameter is not applicable to this specification. tz idedak[a:b]# mode 0 to tri-state mode 1 mode 2 mode 3 20ns 25ns 25ns this parameter specifies the time from the negation edge of dior# to the time that the data bus is no longer driven by the device ( tristate). tg ideior[a:b]# / mode 0 ideiow[a:b]# mode 1 data setup mode 2 mode 3 100ns 30ns 20ns th ideior[a:b]# / mode 0 ideiow[ a:b]# mode 1 write data hold mode 2 mode 3 20ns 15ns 10ns
w83c553f timing diagrams winbond systems laboratory 150 table 6-8 (continued). multiword dma ata data transfer timing parameter values min max notes ti idedak[a:b]# to mode 0 ideior[a:b]# / mode 1 ideiow[a:b]# mode 2 setup mode 3 0ns 0ns 0ns tj ideior[a:b]# / mode 0 ideiow[a:b]# to mode 1 idedak[a:b]# mode 2 hold mode 3 20ns 5ns 5ns tkr idei or[a:b]# negated mode 0 pulse width mode 1 mode 2 mode 3 50ns 50ns 25ns the delay from dior# or diow# until the state of iordy is first sampled. if iordy is inactive, then the host shall wait until iordy is active before the pio cycle can be completed. if the device is not driving iordy negated at the time ta after the activation of dior# or diow#, then t5 shall be met and trd is not applicable. if the device is driving iordy negated at the time ta after the activation of dior# or diow#, then trd shall be met and t5 is not applicable. tkw ideiow[a:b]# negated mode 0 pulse width mode 1 mode 2 mode 3 215ns 50ns 25ns tlr ideior[a:b]# to mode 0 idedrq[a:b] delay mode 1 mode 2 mode 3 120ns 40ns 35ns tlw ideiow[a:b]# to m ode 0 idedrq[a:b] delay mode 1 mode 2 mode 3 40ns 40ns 35ns
w83c553f timing diagrams winbond systems laboratory 151 6.3 isa bus timing table 6-9. isa master write to pci
w83c553f timing diagrams winbond systems laboratory 152 table 6-10. isa master read from pci
w83c553f mechanical description winbond systems laboratory 153 7.0 mechanical desc ription this chapter shows the dimensions of the w83c553f enhanced sio with pci arbiter chip. lead coplanarity: max: 0. 10 mm (0.00 4 in.)
w83c553f thermal information winbond systems laboratory 154 8.0 thermal information theta ja = thermal resistance between junction and ambient for the 208pqfp. theta ja = 43.13 0 c/w (air veloci ty = 0 m/s) 35.25 0 c/w (air velocity = 1 m/s) 30.90 0 c/w (air velocity = 2m/s) theta ja = ( t junction - t ambient ) / p chip ; where p chip = power dissipation on the chip (in watts)
w83c553f appendix a winbond systems laboratory 155 driving capacity of output and input/output pins of 553f (revision g) pin name pin # i/o output cur. note a20m#/pcirst# 22 output pci std. note 1 ad[31:0] 29-31, 33-37, 41-44, 46, 47, 49, 50, 62-67, 69, 71, 73-79, 81 input/output c/be[3:0]# 39, 51, 61, 72 input/output pci std. par 60 input/output pci std. frame# 53 input/output pci std. perr# 58 input/output pci std. irdy# 54 input/output pci std. trdy# 55 input/output pci std. devsel# 56 input/output pci std. stop# 57 input/output pci std. serr# 59 input/od pci std. int[c:d]# 19, 18 input/od pci std. gnt0#/pibreq# 26 output 8 ma note 3 gnt1#/idereq# 28 output 8 ma arbdis#/gnt2# 16 input/output 8 ma pci5th#/gnt3# 13 input/output 8 ma gnt4#/flshreq# 6 output 8 ma pwrpc/x86#/cpugnt# 8 input/output 6 ma idecs0# 87 output 24 ma idecs1#/nat/leg# 86 input/output 24 ma ideiowa# 85 output 24 ma ideiora# 83 output 24 ma ideiowb# 84 output 24 ma ideiorb# 82 output 24 ma idedaka# 94 output 24 ma idedakb# 93 output 24 ma da[2:0] 88, 90, 89 output 24 ma dd[15:0] 98, 101, 103, 105, 108, 110, 112, 114, 115, 113, 111, 109, 106, 104, 102, 100 input/output 24 ma bclk 200 output clock std. note 2 la[23:17] 176, 178, 180, 182, 184, 187, 189 input/output 24 ma sa[16:0] 144, 145, 147-149, 151, 152, 155, 158, 160, 162, 164, 165, 167, 169, 171, 173 input/output 24 ma refresh# 150 input/output 24 ma memr# 141 input/output 24 ma memw# 142 input/output 24 ma ior# 140 input/output 24 ma iow# 139 input/output 24 ma smemr# 138 output 24 ma smemw# 137 output 24 ma sbhe# 174 input/output 24 ma m16# 175 input/output 24 ma
w83c553f appendix a winbond systems laboratory 156 iochrdy 135 input/output 24 ma bale 168 output 24 ma aen 136 output 24 ma tc 166 output 24 ma dak[2:0] 194, 192, 195 output 24 ma pmact#/isarst 5 output 16 ma sd[15:0] 208-204, 202, 199, 197, 123, 125, 126, 128-131, 133 input/output 24 ma security/xdr# 116 input/output 24 ma xoe# 117 input/output 24 ma xcs0/romcs 119 output 24 ma xcs1/x8xcs 118 output 24 ma int 10 output 4 ma nmi 11 output 4 ma init 3 output 4 ma spkr 134 output 24 ma ignne#/hreset# 4 output 6 ma note 1: the driving capacity of these i/o cells is based on pci specification note 2: this is the clock output buffer. note 3: at this current, v olmax <= 0.4v , v ohmin >= 3.0v

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