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copyright ? 1998, v3 semiconductor corp. v292bmc data sheet rev 3.2x 1 v 2 9 2b mc r ev. d high performance burst dram controller for am29030/40 p rocessors v3 semiconductor reserves the right to change the specifications of this product without notice. v 2 9 2b mc is t rademark o f v3 semiconductor. all other trademarks are the property of their respective owners. am29030/40 cpu v 292bmc memory control d r a m rom v xxxepc local to pci bridge pci peripheral pci slot or edge connector typical application ? pin/software compatible with earlier v 2 9 2b mc. ? direct interfaces to am29030/40 p rocessors. ? 3.3v dram interface support. ? near sram performance achieved with dram. ? supports up to 512mb of dram. ? interleaved or non-interleaved operation. ? supports symmetric and non-symmetric arrays. ? software-configured operational parameters. ? integrated page cache management. ? 2kbyte burst transaction support. ? on chip memory address multiplexer/drivers. ? two 24-bit timers, 8-bit bus watch timer . ? up to 40mhz operation. ? low cost 132-pin pqfp package . the v292bmc revision d burst dra m controller is an enhanced v ersion of the previous v 2 9 2b mc with i mproved timing and p rovides dedicated power and ground rails t o support the i ncreasingly popular 3.3v dram modules. ti ming parameters are also improved over the older versions of the d evice. the v 2 9 2b mc provides the dram access protocols, buffer signals, data multiplexer signals, and bus timing resources required to work with dram. by using the v 2 9 2 6bmc, system designers can replace tedious design work, expensive fpgas and valuable board space with a single, high-performance, easily configured device. the processor interface of the v 2 9 2b mc implements the bus protocol of the am29030/40. the pin naming convention has been duplicated on the v 2 9 2b mc; simply wire like-named pins together to create the interface. the v 2 9 2b mc supports a total dram memory subsystem size of 512mbytes. the array may be organized as 1 or 2 leafs o f 32-bits each. standard memory sizes of 256kbit to 64mbit devices are supported and 8, 16, and 32-bit accesses are allowed. the v 2 9 2b mc takes advantage of fast page mode or edo drams and row comparison logic to achieve static ram performance using dynamic rams. control signals required for optional external data path buffers/latches are also provided by the v 2 9 2b mc. the v 2 9 2b mc provides an 8-bit bus watch timer to detect and recover from accesses to unpopulated memory regions.two 24-bit counters/timers can supply an external interrupt signal at a constant frequency relative to the system clock. the v 292b mc is packaged in a low-cost 132-pin pqfp package and is available in 25, 33, or 40mhz versions. this document contains the product codes, pinouts, package mechanical information, dc characteristics, and ac characteristics for the v 2 9 2bm c. detailed functional information is contained in the user?s manual.
v292bmc rev.d 2 v292bmc rev d data sheet rev 3.2 copyright ? 1998 , v3 semiconductor inc. v3 semiconductor retains the rights to change documentation, specifications, or device functionality at any time without notice. please verify that you have the latest copy of all documents before finalizing a design. 1.0 product codes table 1 : pin types 2.0 pin description and pinout table 2 below lists the pin types found on the v 2 9 2b mc. table 3 describes the function of each pin on the v 2 9 2b mc. table 4 lists the pins by pin number. figure 1 shows the pinout for the 132-pin pqfp package and figure 2 shows the mechanical dimensions of the package. product code processor bus type package frequency v292bmc-33lp am29030/35/40 32-bit demultiplexed 132-pin pqfp 33mhz V292BMC-40LP am29030/35/40 32-bit demultiplexed 132-pin pqfp 40mhz table 2: pin types pin type description i/o 12 ttl i/o pin with 12 ma output drive i ttl input only pin o 12 ttl output pin with 12 ma output drive o 12 -3 ttl output pin with 12 ma output drive that can be configured for either 5 volt or 3.3 volt signaling, t hese outputs can be configured for 3.3v operation by connecting the vcc3 power pins to a 3.3v power plane (vcc should always be connected to a 5v supply). v cc3 can also be connected to the 5v plane if 5v signaling is desired.
v292bmc rev.d copyright ? 1998 , v3 semiconductor corp. v292bmc rev d data sheet rev 3.2 3 table 3: s ignal descriptions memory interface signals signal type r a description aa[11:0] ab[11:0] o 12 -3 x leaf a and b row and column address, multiplexed on the same pins. when non-interleaved operation is selected, only address bus a a should be used. rasa[3:0] rasb[3:0] o 12 -3 h row address strobe. these strobes indicate the presence of a valid row address on busses aa(b)[11:0]. these signals are to be con- nected one to each 32-bit leaf o f memory. casa[3:0] casb[3:0] o 12 -3 h column address strobe. these strobes latch a column address from aa(b)[11:0]. they are assigned one to each byte in a leaf. mwea mweb o 12 -3 h memory write enable. these are the dram write strobes. one is supplied for each leaf t o minimize signal loading. rfs /auxt o 12 h refresh in progress. this output is multi-function signal. the signal name, as it appears on the logic symbol, is the default signal names. this signal gives notice that a refresh cycle is to be executed. t he timing leads ras only refresh b y one cycle. the output may also function as aux timer interrupt. configuration signal type r description mod4 i selects modulo 4 (word) bursting for multiplexed address aa(b). buffer controls signals signal type r description txa txb o 12 h data transmit a and b. these outputs are multi-function signals. the signal names, as they appear on the logic symbol, are the default signal names (mode 0). the purpose of these outputs is to control buffer output enables during data read transactions and, in effect, control the multiplexing of data from each memory leaf o nto the am29030/40 d ata bus. lea leb o 12 l these outputs are mode independent, however, the timing of the signals change for different operational modes. they control trans- parent latches that hold data transmitted during a write transaction. in modes 0 and 1, the latch controls follow the timing of cas for each leaf, while in modes 2 and 3 the timing of lea and leb is shortened to 1/2 clock. local bus interface
v292bmc rev.d 4 v292bmc rev d data sheet rev 3.2 copyright ? 1998 , v3 semiconductor inc. signal type r description a[31:2] i local address bus. ale i address latch enable: controls a set of transparent latches on the address bus. when asserted high, the address input flows through the latch. when ale is low, the internal address holds the previous value. with an am29030/40 p rocessor ale is not typically used and has an internal pull-up resistor that will keep it high when not con- nected (to provide backward pin compatibility with earlier versions). i/ d i data/ code . b w e[3:0] i local bus byte write enables. r/ w i read/ write . r eq i asserted low to indicate the beginning of a bus cycle. rdy o 12 z local bus data ready. prdy i processor ready sup/ us i indicates supervisor mode. required for access to configuration reg- isters. b urs t i burst request. err o 12 h bus time-out error. int o 12 h local interrupt request. this signal is asserted when the 24-bit counter reaches terminal count, and interrupt out is enabled. may be programmed for pulse or level operation. reset i local bus reset signal. memc lk i local bus clock. id[2:0] i these inputs select the address offset of the configuration registers. power and ground signals signal type r description vcc - power leads intended for external connection to a 5v vcc plane vcc 3 - power for dram control outputs. can be connected to 3.3v or 5v. gnd - ground leads intended for external connection to a gnd p lane. a. r indicates state during reset. table 3: s ignal descriptions (cont?d)
v292bmc rev.d copyright ? 1998 , v3 semiconductor corp. v292bmc rev d data sheet rev 3.2 5 table 4: pin assignments pin # signal pin # signal pin # signal pin # signal 1 a14 34 req 67 aa10 100 ab9 2 a15 35 b w e2 68 aa11 101 ab10 3 a16 36 b w e3 69 vcc3 102 ab11 4 vcc 37 gnd 70 gnd 103 vcc3 5 a17 38 r d y 71 casa0 104 gnd 6 a19 39 id0 72 casa1 105 casb0 7 a20 40 id1 73 casa2 106 casb1 8 a18 41 id2 74 casa3 107 casb2 9 a21 42 rfs /auxt 75 vcc3 108 casb3 10 a24 43 lea 76 gnd 109 vcc3 11 a22 44 leb 77 rasa0 110 gnd 12 a23 45 txa 78 rasa1 111 rasb0 13 a26 46 txb 79 rasa2 112 rasb1 14 a25 47 vcc 80 rasa3 113 rasb2 15 a27 48 gnd 81 vcc3 114 rasb3 16 ale 49 - 82 mwea 115 vcc 17 - 50 - 83 - 116 - 18 - 51 - 84 - 117 mod4 19 a31 52 - 85 - 118 mweb 20 a28 53 aa0 86 gnd 119 gnd 21 a29 54 aa1 87 ab0 120 reset 22 a30 55 aa2 88 ab1 121 a2 23 i/ d 56 aa3 89 ab2 122 a3 24 sup/ us 57 vcc3 90 ab3 123 a4 25 memc lk 58 gnd 91 vcc3 124 a5 26 int 59 aa4 92 gnd 125 a6 27 e rr 60 aa5 93 ab4 126 a7
v292bmc rev.d 6 v292bmc rev d data sheet rev 3.2 copyright ? 1998 , v3 semiconductor inc. figure 1 : pinout for 132-pin pqfp (top view) pin # signal pin # signal pin # signal pin # signal 28 r/ w 61 aa6 94 ab5 127 a8 29 b we 0 62 aa7 95 ab6 128 a9 30 prdy 63 vcc3 96 ab7 129 a10 31 b urs t 64 gnd 97 vcc3 130 a11 32 b w e1 65 aa8 98 gnd 131 a12 33 gnd 66 aa9 99 ab8 132 a13 table 4: pin assignments (cont?d)
v292bmc rev.d copyright ? 1998 , v3 semiconductor corp. v292bmc rev d data sheet rev 3.2 7 figure 2 : 1 32-pin pqfp mechanical details
v292bmc rev.d 8 v292bmc rev d data sheet rev 3.2 copyright ? 1998 , v3 semiconductor inc. 3.0 dc specifications 1. for 3.3 volt dram intreface operation.( s ee also note 8 table 11) table 5: absolute maximum ratings symbol parameter rating units v cc supply voltage -0.3 to +7 v v in dc input voltage -0.3 to v cc +0.3 v i in dc input current 50 ma t stg storage temperature -65 to +150 c table 6: guaranteed operating conditions symbol parameter rating units v cc, v cc 3 supply voltage 4.75 to 5.25 v v cc 3 supply voltag e for 3.3 volt dram inter- face operation 1 . vcc is still as above 3.0 t o 3.6 v t a ambient temperature range 0 to 70 c table 7: d c operating specifications vcc=5 volt and vcc3=5 volt symbol description conditions min max units v il low level input voltage vcc = 4.75v 0.8 v v ih high level input voltage vcc = 5.25v 2.0 v i il low level input current v in = gnd, v cc = 5.25v -10 m a i ih high level input current v in = v cc = 5.25v 10 m a v ol low level output voltage v in = v il or v ih i ol = -12 ma 0.4 v v oh high level output voltage v in = v il or v ih i ol = -12 ma v cc -1.0 v
v292bmc rev.d copyright ? 1998 , v3 semiconductor corp. v292bmc rev d data sheet rev 3.2 9 4.0 ac specifications 1. for 3.3 volt dram interface o peration.( s ee also note 8 table 11) i ozl low level float input leakage v in = v il or v ih v o = -gnd -20 m a i ozh high level float input leakage v in = v il or v ih v o = -5.25v 20 m a i cc (max) maximum supply current continuous simple access continuous burst access 100 30 ma c io input and output capacitance 20 pf table 8: d c operating specifications vcc3=3.3 volt and vcc=5 volt symbol description conditions min max units v ol low level output voltage v in = vcc3 i ol = 12 m a 0.4 v v oh high level output voltage v in = vcc3 i ol = -12 ma 2.4 v i ozl low level float input leakage v in = vcc3 v o = g nd -10 m a i ozh high level float input leakage v in = vcc3 v o = 4.465 v 10 m a i cc (max) maximum supply current continuous simple access continuous burst access 140 40 ma table 9: ac test conditions symbol parameter limits units v cc, v cc 3 supply voltage 4.75 to 5.25 v v cc 3 supply voltage for 3.3 volt dram inter- face operation 1 (vcc is still as above) 4.75 to 5.25 v v in input low and high voltages 0.4 and 4.25 v c out capacitive load on output and i/o pins 50 pf table 7: d c operating specifications vcc=5 volt and vcc3=5 volt symbol description conditions min max units
v292bmc rev.d 10 v292bmc rev d data sheet rev 3.2 copyright ? 1998 , v3 semiconductor inc. table 10: c apacitive derating for output and i/o pins output drive limit supply voltage derating 12 ma vcc=5 volt, vcc3=3.3 volt 0.06 ns/pf for loads > 50 pf 12 ma vcc=5 volt, vcc3=5 volt 0.04 ns/pf for loads > 50 pf table 11: t iming parameters for v 2 9 2b mc v cc = 5 volts +/- 5% and vcc3 = 5 or 3.3 8 volts +/- 5% 33 mhz 40 mhz symbol description note min max min max units t c memclk p eriod 30 25 ns t ch memc lk high time 12 11 ns t cl memc lk low time 12 11 ns t su synchronous input setup 9 8 ns t h synchronous input hold 1 0.5 ns t h synchronous input hold (reset#) 3 3 ns t rzh r d y 3-state to valid delay 1 3 13 3 10 ns t rhl r d y synchronous assertion delay 3 13 3 11 ns t rlh r d y synchronous de-assertion delay 3 13 3 11 ns t rhz r d y valid to 3-state delay 1 3 10 3 7 ns t ehl e rr synchronous assertion delay 3 13 3 11 ns t elh e rr synchronous de-assertion delay 3 12 3 10 ns t ihl int synchronous assertion delay 3 13 3 11 ns t ilh int synchronous de-assertion delay 3 12 3 10 ns t ara1 address input to row address output delay (interleaved) 3 14 3 12 ns t ara2 address input to row address output delay (non-interleaved) 4 18 4 15 ns t rah row address hold from ras assertion 2 t m t m +2 t m t m +2 ns t cav column address valid from ras assertion 2 t m +1 t m +4 t m +1 t m +4 ns t cah column address hold from cas assertion t c t c ns t bcav column address valid delay from previous cas assertion (burst) t c +3 t c +3 ns t rhl memc lk to ras asserted delay 3 13 3 11 ns t rlh memc lk to ras de-asserted delay 3 13 3 11 ns t ras ras pulse width 3 3t c -1 3t c -1 ns t rsh ras hold from last cas assertion 4 t n t n ns t rp ras precharge time 5 t p -2 t p -2 ns t chl memc lk to cas asserted delay 1 3 13 3 12 ns
v292bmc rev.d copyright ? 1998 , v3 semiconductor corp. v292bmc rev d data sheet rev 3.2 11 n otes: 1. s pecified from memc lk falling edge. 2. t m = t c when t_mux = 1; t m = 0.5 t c when t_mux = 0. 3. maximum ras pulse width depends on the number of burst access. 4. t n = 1.5 t c when t_ras = 0; t n = 2.5 t c when t_ras = 1. 5. t p = 2 t c when t_ras = 0; t p = 2 t c when t_ras = 1 and t_rp = 1; t p = 3 t c when t_ras = 1 and t_rp = 0. 6. rising delay is measured from mem c lk falling edge, f alling delay is measured from mem c lk rising edge. 7. exce p t for mode 2 and 3 at txa pin . 8. in order to have 3.3 volt dram interface vcc3 pins must be connected to 3.3 volt. vcc3 pins are: pin # 91, 97, 103, 57, 63, 69, 75, 81. the power supply pins that must always be connected to 5 volt are vcc. vcc pins are: pin # 4, 47, 115. figure 3 : clock and synchronous signals t clh memc lk to cas de-asserted delay 4 12 3 11 ns t cas cas pulse width 4 t n -1 t n -1 ns t cpn cas precharge time 0.5t c 0.5t c ns t rcd ras to cas delay time 1.5t c -2 1.5t c 1.5t c -2 1.5t c ns t wesu write enable setup to ras assertion 10 9 ns t weh write enable hold from ras de-assertion 1 3 1 3 ns t led memc lk to latch enable output delay 6 3 12 3 10 ns t txhl1 memc lk to buffer control fall delay 7 3 13 3 11 ns t txhl2 memc lk to buffer control fall delay (mode 2 and 3 at txa pin only) 4 15 4 13 ns t txlh memc lk to buffer control rise delay 3 12 3 10 ns t rfhl refresh synchronous assertion delay 3 13 3 11 ns t rflh refresh synchronous de-assertion delay 3 13 3 11 ns t asu address setup to ale falling 6 5 ns t ah address hold from ale falling 5 4 ns table 11: t iming parameters for v 2 9 2b mc v cc = 5 volts +/- 5% (cont?d) and vcc3 = 5 or 3.3 8 volts +/- 5%
v292bmc rev.d 12 v292bmc rev d data sheet rev 3.2 copyright ? 1998 , v3 semiconductor inc. figure 4 : ale timing figure 5 : basic access timing
v292bmc rev.d copyright ? 1998 , v3 semiconductor corp. v292bmc rev d data sheet rev 3.2 13 figure 6 : burst access timing
v292bmc rev.d 14 v292bmc rev d data sheet rev 3.2 copyright ? 1998 , v3 semiconductor inc. 5.0 revision history table 12: r evision history revision number date comments and changes 3.2 7 /9 8 v 2 9 2b mc rev d timing parameters with 3.3v dram support. 3.1 10/96 data book revision. 3.0 05/96 u pdated timings to final d-step values. s implified data sheet format. 2.0 7/92 updated timings to final a-step values. 1.0 7/92 first pre-silicon revision of preliminary data sheet. dc and ac specs t bd. sent only to a limited number of customers

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