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1 december 2003 dsc-4680/9 ? 2003 integrated device technology, inc. all rights reserved. product specifications subject to change without notice. 3.3 volt high-density supersync ii? 72-bit fifo 512 x 72, 1,024 x 72 2,048 x 72, 4,096 x 72 8,192 x 72, 16,384 x 72 32,768 x 72, 65,536 x 72 idt72v7230, idt72v7240 idt72v7250, idt72v7260 idt72v7270, idt72v7280 idt72v7290, idt72v72100 idt and the idt logo are registered trademarks of integrated device technology, inc. supersync ii fifo is a trademark of integr ated device technology, inc. commercial temperature range features: ? ? ? ? ? choose among the following memory organizations: idt72v7230 ? ? ? ? ? 512 x 72 idt72v7240 ? ? ? ? ? 1,024 x 72 idt72v7250 ? ? ? ? ? 2,048 x 72 idt72v7260 ? ? ? ? ? 4,096 x 72 idt72v7270 ? ? ? ? ? 8,192 x 72 idt72v7280 ? ? ? ? ? 16,384 x 72 idt72v7290 ? ? ? ? ? 32,768 x 72 idt72v72100 ? ? ? ? ? 65,536 x 72 ? ? ? ? ? 100 mhz operation (10 ns read/write cycle time) ? ? ? ? ? user selectable input and output port bus-sizing - x72 in to x72 out - x72 in to x36 out - x72 in to x18 out - x36 in to x72 out - x18 in to x72 out ? ? ? ? ? big-endian/little-endian user selectable word representation ? ? ? ? ? fixed, low first word latency ? ? ? ? ? zero latency retransmit ? ? ? ? ? auto power down minimizes standby power consumption ? ? ? ? ? master reset clears entire fifo ? ? ? ? ? partial reset clears data, but retains programmable settings ? ? ? ? ? empty, full and half-full flags signal fifo status ? ? ? ? ? programmable almost-empty and almost-full flags, each flag can default to one of eight preselected offsets ? ? ? ? ? selectable synchronous/asynchronous timing modes for almost- empty and almost-full flags ? ? ? ? ? program programmable flags by either serial or parallel means ? ? ? ? ? select idt standard timing (using ef and ff flags) or first word fall through timing (using or and ir flags) ? ? ? ? ? output enable puts data outputs into high impedance state ? ? ? ? ? easily expandable in depth and width ? ? ? ? ? independent read and write clocks (permit reading and writing simultaneously) ? ? ? ? ? asynchronous operation of output enable, oe ? ? ? ? ? read chip select ( rcs ) on read side ? ? ? ? ? available in a 256-pin fine pitch ball grid array package (pbga) ? ? ? ? ? features jtag (boundary scan) ? ? ? ? ? high-performance submicron cmos technology ? ? ? ? ? industrial temperature range (?40 c to +85 c) is available functional block diagram input register output register ram array 512 x 72 1,024 x 72 2,048 x 72 4,096 x 72 8,192 x 72 16,384 x 72 32,768 x 72 65,536 x 72 flag logic ff / ir paf ef / or pae hf read pointer read control logic write control logic reset logic wen wclk d 0 -d n (x72, x36 or x18) ld mrs ren rclk q 0 -q n (x72, x36 or x18) offset register fwft/si sen rt 4680 drw01 bus configuration bm control logic be ow ip pfm fsel0 fsel1 iw rm sclk oe prs jtag control (boundary scan) tck tms trst tdo tdi rcs write pointer
2 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 pin configuration pbga (bb256-1, order code: bb) top view description: the idt72v7230/72v7240/72v7250/72v7260/72v7270/72v7280/ 72v7290/72v72100 are exceptionally deep, high speed, cmos first-in-first- out (fifo) memories with clocked read and write controls and a flexible bus- matching x72/x36/x18 data flow. these fifos offer several key user benefits: ? flexible x72/x36/x18 bus-matching on both read and write ports the period required by the retransmit operation is fixed and short. the first word data latency period, from the time the first word is written to an empty fifo to the time it can be read, is fixed and short. high density offerings up to 4 mbit bus-matching sync fifos are particularly appropriate for network, video, telecommunications, data communications and other applications that need to buffer large amounts of data and match busses of unequal sizes. each fifo has a data input port (d n ) and a data output port (q n ), both of which can assume either a 72-bit, 36-bit or a 18-bit width as determined by the state of external control pins input width (iw), output width (ow), and bus- matching (bm) pin during the master reset cycle. the input port is controlled by a write clock (wclk) input and a write enable ( wen ) input. data is written into the fifo on every rising edge of wclk when wen is asserted. the output port is controlled by a read clock (rclk) input a b c d e f g h j k l m n p r t q33 q32 q31 q29 q17 q14 q11 q62 q59 q56 q44 q41 q38 q26 q24 q23 q35 q34 q30 q28 q16 q13 q10 q61 q58 q55 q43 q40 q37 q25 q21 q22 q47 q46 q45 q27 q15 q12 q9 q60 q57 q54 q42 q39 q36 q18 q19 q20 q50 q49 q48 sen d51 d52 d53 gnd ld d3 d4 d5 d63 d64 d65 d0 d1 d2 d66 d67 d68 gnd prs wen ren d69 d70 d71 tdi ip rcs ef ff q69 q70 q71 tck be q0 pae rclk q66 q67 q68 gnd vcc q2 wclk paf d47 d46 d45 vcc hf q1 oe mrs d6 d7 d8 gnd vcc q3 q4 q5 d50 d49 d48 vcc q6 q7 q8 q63 q64 q65 d27 d15 d12 d9 d60 d57 d54 d42 d39 d36 d18 d19 d20 q51 q52 q53 d28 d16 d13 d10 d61 d58 d55 d43 d40 d37 d25 d21 d22 d33 d32 d31 d29 d17 d14 d11 d62 d59 d56 d44 d41 d38 d26 d24 d23 12 3456 7 8910111213141516 a1 ball pad corner gnd gnd gnd gnd gnd gnd vcc trst vcc vcc vcc vcc vcc vcc vcc fs0 tdo gnd gnd gnd gnd gnd gnd gnd ow tms vcc vcc vcc vcc vcc vcc gnd vcc gnd gnd gnd gnd gnd gnd gnd vcc vcc vcc vcc vcc vcc vcc vcc gnd gnd gnd gnd gnd gnd gnd fs1 gnd gnd vcc vcc vcc vcc vcc bm gnd gnd gnd gnd gnd gnd pfm rt vcc vcc vcc vcc vcc vcc fwft/ si rm gnd 4680 drw02 gnd sclk d35 d34 d30 iw
3 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 description (continued) figure 1. single device configuration signal flow diagram and read enable ( ren ) input. data is read from the fifo on every rising edge of rclk when ren is asserted. an output enable ( oe ) input is provided for three-state control of the outputs. a read chip select ( rcs ) input is also provided for synchronous enable and disable of the read port control input, ren . the rcs input is synchronized to the read clock, and also provides three-state control of the q n outputs. when rcs is disable, ren will be disabled internally and data outputs will be in high-impedance state. the frequencies of both the rclk and the wclk signals may vary from 0 to f max with complete independence. there are no restrictions on the frequency of the one clock input with respect to the other. there are two possible timing modes of operation with these devices: idt standard mode and first word fall through (fwft) mode. in idt standard mode, the first word written to an empty fifo will not appear on the data output lines unless a specific read operation is performed. a read operation, which consists of activating ren and enabling a rising rclk edge, will shift the word from internal memory to the data output lines. in fwft mode, the first word written to an empty fifo is clocked directly to the data output lines after three transitions of the rclk signal. a ren does not have to be asserted for accessing the first word. however, subsequent words written to the fifo do require a low on ren for access. the state of the fwft/si input during master reset determines the timing mode in use. for applications requiring more data storage capacity than a single fifo can provide, the fwft timing mode permits depth expansion by chaining fifos in series (i.e. the data outputs of one fifo are connected to the corresponding data inputs of the next). no external logic is required. these fifos have five flag pins, ef / or (empty flag or output ready), ff / ir (full flag or input ready), hf (half-full flag), pae (programmable almost-empty flag) and paf (programmable almost-full flag). the ef and ff functions are selected in idt standard mode. the ir and or functions are selected in fwft mode. hf , pae and paf are always available for use, irrespective of timing mode. pae and paf can be programmed independently to switch at any point in memory. programmable offsets determine the flag switching threshold and can be loaded by two methods: parallel or serial. eight default offset settings are also provided, so that pae can be set to switch at a predefined number of locations from the empty boundary and the paf threshold can also be set at similar predefined values from the full boundary. the default offset values are set during master reset by the state of the fsel0, fsel1, and ld pins. for serial programming, sen together with ld on each rising edge of sclk, are used to load the offset registers via the serial input (si). for parallel programming, wen together with ld on each rising edge of wclk, are used to load the offset registers via d n . ren together with ld on each rising edge of rclk can be used to read the offsets in parallel from q n regardless of whether serial or parallel offset loading has been selected. (x72, x36, x18) data out (q 0 - q n ) (x72, x36, x18) data in (d 0 - d n ) master reset ( mrs ) read clock (rclk) read enable ( ren ) output enable ( oe ) empty flag/output ready ( ef / or ) programmable almost-empty ( pae ) write clock (wclk) write enable ( wen ) load ( ld ) full flag/input ready ( ff / ir ) programmable almost-full ( paf ) idt 72v7230 72v7240 72v7250 72v7260 72v7270 72v7280 72v7290 72v72100 partial reset ( prs ) first word fall through/serial input (fwft/si) retransmit ( rt ) 4680 drw03 half-full flag ( hf ) serial enable( sen ) input width (iw) output width (ow) big-endian/little-endian ( be ) interspersed/ non-interspersed parity (ip) bus- matching (bm) serial in clock(sclk) jtag clock (tclk) jtag reset ( trst ) jtag mode (tms) (tdo) (tdi) read chip select ( rcs )
4 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 bm iw ow write port width read port width l x x x72 x72 h h l x36 x72 h h h x18 x72 h l l x72 x36 h l h x72 x18 table 1 bus-matching configuration modes during master reset ( mrs ) the following events occur: the read and write pointers are set to the first location of the fifo. the fwft pin selects idt standard mode or fwft mode. the partial reset ( prs ) also sets the read and write pointers to the first location of the memory. however, the timing mode, programmable flag programming method, and default or programmed offset settings existing before partial reset remain unchanged. the flags are updated according to the timing mode and offsets in effect. prs is useful for resetting a device in mid-operation, when reprogramming programmable flags would be undesirable. it is also possible to select the timing mode of the pae (programmable almost- empty flag) and paf (programmable almost-full flag) outputs. the timing modes can be set to be either asynchronous or synchronous for the pae and paf flags. if asynchronous pae / paf configuration is selected, the pae is asserted low on the low-to-high transition of rclk. pae is reset to high on the low- to-high transition of wclk. similarly, the paf is asserted low on the low- to-high transition of wclk and paf is reset to high on the low-to-high transition of rclk. if synchronous pae / paf configuration is selected , the pae is asserted and updated on the rising edge of rclk only and not wclk. similarly, paf is asserted and updated on the rising edge of wclk only and not rclk. the mode desired is configured during master reset by the state of the programmable flag mode (pfm) pin. the retransmit function allows data to be reread from the fifo more than once. a low on the rt input during a rising rclk edge initiates a retransmit operation by setting the read pointer to the first location of the memory array. a zero-latency retransmit timing mode can be selected using the retransmit timing mode pin (rm). during master reset, a low on rm will select zero latency retransmit. a high on rm during master reset will select normal latency. if zero latency retransmit operation is selected, the first data word to be retransmitted will be placed on the output register with respect to the same rclk edge that initiated the retransmit based on rt being low. refer to figure 16 and 17 for retransmit timing with normal latency. refer to figure 18 and 19 for zero latency retransmit timing . the device can be configured with different input and output bus widths as shown in table 1. a big-endian/little-endian data word format is provided. this function is useful when the fifo is used in bus-matching mode, to determine order of the words. as an example, if big-endian mode is selected, then the most significant word of the long word written into the fifo will be read out of the fifo first, followed by the least significant word. if little-endian format is selected, then the least significant word of the long word written into the fifo will be read out first, followed by the most significant word. the mode desired is configured during master reset by the state of the big-endian ( be ) pin. the interspersed/non-interspersed parity (ip) bit function allows the user to select the parity bit in the word loaded into the parallel port (d0-dn) when programming the flag offsets. if interspersed parity mode is selected, then the fifo will assume that the parity bit is located in bit position d8 during the parallel programming of the flag offsets. if non-interspersed parity mode is selected, then d8 is assumed to be a valid bit and d16 and d17 are ignored. ip mode is selected during master reset by the state of the ip input pin. if, at any time, the fifo is not actively performing an operation, the chip will automatically power down. once in the power down state, the standby supply current consumption is minimized. initiating any operation (by activating control inputs) will immediately take the device out of the power down state. both an asynchronous output enable pin ( oe ) and synchronous read chip select pin ( rcs ) are provided on the fifo. the synchronous read chip select is synchronized to the rclk. both the output enable and read chip select control the output buffer of the fifo, causing the buffer to be either high impedance or low impedance. jtag test pins are also provided, the fifo has fully functional boundary scan feature, compliant with ieee 1149.1 standard test access port and boundary scan architecture. the idt72v7230/72v7240/72v7250/72v7260/72v7270/72v7280/ 72v7290/72v72100 are fabricated using idt?s high speed submicron cmos technology.
5 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 pin description symbol name i/o description d 0 ?d 71 data inputs i data inputs for a 72-, 36- or 18-bit bus. when in 36- or 18-bit mode, the unused input pins should be tied low. mrs master reset i mrs initializes the read and write pointers to zero and sets the output register to all zeroes. during master reset, the fifo is configured for either fwft or idt standard mode, bus-matching configurations, one of eight programmable flag default settings, serial or parallel programming of the offset settings, big-endian/little-endian format, zero latency timing mode, interspersed parity, and synchronous versus asynchronous programmable flag timing modes. prs partial reset i prs initializes the read and write pointers to zero and sets the output register to all zeroes. during partial reset, the existing mode (idt or fwft), programming method (serial or parallel), and programmable flag settings are all retained. rt retransmit i rt asserted on the rising edge of rclk initializes the read pointer to zero, sets the ef flag to low ( or to high in fwft mode) and does not disturb the write pointer, programming method, existing timing mode or programmable flag settings. rt is useful to reread data from the first physical location of the fifo. fwft/si first word fall i during master reset, selects first word fall through or idt standard mode. after master reset, this pin functions through/serial in as a serial input for loading offset registers. ow output width i this pin, along with iw and bm, selects the bus width of the read port. see table 1 for bus size configuration. iw input width i this pin, along with ow and bm, selects the bus width of the write port. see table 1 for bus size configuration. bm bus-matching i bm works with iw and ow to select the bus sizes for both write and read ports. see table 1 for bus size configuration. be big-endian/ i during master reset, a low on be will select big-endian operation. a high on be during master reset little-endian will select little-endian format. rm retransmit timing i during master reset, a low on rm will select zero latency retransmit timing mode. a high on rm will select mode normal latency mode. pfm programmable i during master reset, a low on pfm will select asynchronous programmable flag timing mode. a high on flag mode pfm will select synchronous programmable flag timing mode. ip interspersed parity i during master reset, a low on ip will select non-interspersed parity mode. a high will select interspers ed parity mode. fsel0 flag select bit 0 i during master reset, this input along with fsel1 and the ld pin, will select the default offset values for the programmable flags pae and paf . there are up to eight possible settings available. fsel1 flag select bit 1 i during master reset, this input along with fsel0 and the ld pin will select the default offset values for the programmable flags pae and paf . there are up to eight possible settings available. wclk write clock i when enabled by wen , the rising edge of wclk writes data into the fifo and offsets into the programmable registers for parallel programming. wen write enable i wen enables wclk for writing data into the fifo memory and offset registers. rclk read clock i when enabled by ren , the rising edge of rclk reads data from the fifo memory and offsets from the programmable registers. ( rcs must be active). ren read enable i ren enables rclk for reading data from the fifo memory and offset registers. ( rcs must be active). oe output enable i oe provides asynchronous control of the output impedance of q n. during a master or partial reset the oe input is the only input that provide high-impedance control of the data outputs. rcs read chip select i rcs provides synchronous control of the read port and output impedance of q n, synchronous to rclk . during a master or partial reset the rcs input is don?t care, if oe is low the data outputs will be low-impedance regardless of rcs . sclk serial input clock i when enabled by sen , the rising edge of sclk writes one bit of data (present on the si input), into the programmable register for serial programming. sen serial enable i sen enables serial loading of programmable flag offsets. ld load i this is a dual purpose pin. during master reset, the state of the ld input along with fsel0 and fsel1, determines one of eight default offset values for the pae and paf flags, along with the method by which these offset registers can be programmed, parallel or serial (see table 2). after master reset, this pin enables writing to and reading from the offset registers. ff / ir full flag/ o in the idt standard mode, the ff function is selected. ff indicates whether or not the fifo memory is full. input ready in the fwft mode, the ir function is selected. ir indicates whether or not there is space available for writing to the fifo memory.
6 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 symbol name i/o description pin description (continued) ef / or empty flag/ o in the idt standard mode, the ef function is selected. ef indicates whether or not the fifo memory is empty. output ready in fwft mode, the or function is selected. or indicates whether or not there is valid data available at the outputs. paf programmable o paf goes high if the number of free locations in the fifo memory is more than offset m, which is stored in almost-full flag the full offset register. paf goes low if the number of free locations in the fifo memory is less than or equal to m. pae programmable o pae goes low if the number of words in the fifo memory is less than offset n, which is stored in the empty almost-empty offset register. pae goes high if the number of flag words in the fifo memory is greater than or equal to offset n. hf half-full flag o hf indicates whether the fifo memory is more or less than half-full. q 0 ?q 71 data outputs o data outputs for an 72-, 36- or 18-bit bus. when in 36- or 18-bit mode, the unused output pins should not be connected. data outputs are not 5v tolerant regardless of the state of the oe and rcs . tck (1) jtag clock i clock input for jtag function. one of four terminals required by ieee standard 1149.1-1990. test operations of the device are synchronous to tck. data from tms and tdi are sampled on the rising edge of tck and outputs change on the falling edge of tck. if the jtag function is not used this signal needs to be tied to gnd. tdi (1) jtag test data input i one of four terminals required by ieee standard 1149.1-1990. during the jtag boundary scan operation, test data serially loaded via the tdi on the rising edge of tck to either the instruction register, id register and bypass register. an internal pull-up resistor forces tdi high if left unconnected. tdo (1) jtag test data output o one of four terminals required by ieee standard 1149.1-1990. during the jtag boundary scan operation, test data serially loaded output via the tdo on the falling edge of tck from either the instruction register, id register and bypass register. this output is high impedance except when shifting, while in shift-dr and shift-ir controller states. tms (1) jtag mode select i tms is a serial input pin. one of four terminals required by ieee standard 1149.1-1990. tms directs the the device through its tap controller states. an internal pull-up resistor forces tms high if left unconnected. trst (1) jtag reset i trst is an asynchronous reset pin for the jtag controller. the jtag tap controller does not automatically reset upon power-up, thus it must be reset by either this signal or by setting tms= high for five tck cycles. if the tap controller is not properly reset then the fifo outputs will always be in high-impedance. if the jtag function is used but the user does not want to use trst , then trst can be tied with mrs to ensure proper fifo operation. if the jtag function is not used then this signal needs to be tied to gnd. note: 1. these pins are for the jtag port. please refer to pages 22-25 and figures 5-7.
7 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 absolute maximum ratings symbol rating commercial unit v term terminal voltage ?0.5 to +4.5 v with respect to gnd t stg storage ?55 to +125 c temperature i out dc output current ?50 to +50 ma note: 1. stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. notes: 1. with output deselected, ( oe v ih ). 2. characterized values, not currently tested. dc electrical characteristics (commercial: v cc = 3.3v 0.15v, t a = 0 c to +70 c; jedec jesd8-a compliant) capacitance (t a = +25 c, f = 1.0mhz) symbol parameter (1) conditions max. unit c in (2) input v in = 0v 10 pf capacitance c out (1,2) output v out = 0v 10 pf capacitance recommended dc operating conditions symbol parameter min. typ. max. unit v cc supply voltage 3.15 3.3 3.45 v gnd supply voltage 0 0 0 v v ih input high voltage 2.0 ? v cc +0.3 v v il (1) input low voltage ? ? 0.8 v t a operating temperature 0 ? 70 c commercial notes: 1. v cc = 3.3v 0.15v, jedec jesd8-a compliant. 2. 1.5v undershoots are allowed for 10ns once per cycle. idt72v7230l idt72v7240l idt72v7250l idt72v7260l idt72v7270l idt72v7280l IDT72V7290L idt72v72100l commercial t clk = 10, 15 ns symbol parameter min. max. unit i li (1) input leakage current ?10 10 a i lo (2) output leakage current ?10 10 a v oh output logic ?1? voltage, i oh = ?2 ma 2.4 ? v v ol output logic ?0? voltage, i ol = 4 ma ? 0.4 v i cc1 (3,4,5) active power supply current ? 75 ma i cc2 (3,6) standby current ? 15 ma notes : 1. measurements with 0.4 v in v cc . 2. oe v ih, 0.4 v out v cc. 3. tested with outputs open (i out = 0). 4. rclk and wclk toggle at 20 mhz and data inputs switch at 10 mhz. 5. typical i cc1 = 15.5 + 2.275*f s + 0.002*c l *f s (in ma) with v cc = 3.3v, t a = 25 c, f s = wclk frequency = rclk frequency (in mhz, using ttl levels), data switching at f s /2, c l = capacitive load (in pf). 6. all inputs = v cc - 0.2v or gnd + 0.2v, except rclk and wclk, which toggle at 20 mhz.
8 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 ac electrical characteristics (1) (commercial: v cc = 3.3v 0.15v, t a = 0 c to +70 c; jedec jesd8-a compliant) commercial idt72v7230l10 idt72v7230l15 idt72v7240l10 idt72v7240l15 idt72v7250l10 idt72v7250l15 idt72v7260l10 idt72v7260l15 idt72v7270l10 idt72v7270l15 idt72v7280l10 idt72v7280l15 IDT72V7290L10 IDT72V7290L15 idt72v72100l10 idt72v72100l15 symbol parameter min. max. min. max. unit f s clock cycle frequency ? 100 ? 66.7 m h z t a data access time 1 6.5 1 10 ns t clk clock cycle time 10 ? 15 ? ns t clkh clock high time 4.5 ? 6 ? ns t clkl clock low time 4.5 ? 6 ? ns t ds data setup time 3.5 ? 4 ? ns t dh data hold time 0.5 ? 1 ? ns t ens enable setup time 3.5 ? 4 ? ns t enh enable hold time 0.5 ? 1 ? ns t lds load setup time 3.5 ? 4 ? ns t ldh load hold time 0.5 ? 1 ? ns t rs reset pulse width (2) 10 ? 15 ? ns t rss reset setup time 10 ? 15 ? ns t rsr reset recovery time 10 ? 15 ? ns t rsf reset to flag and output time ? 15 ? 15 ns t fwft mode select time 0 ? 0 ? ns t rts retransmit setup time 3.5 ? 4 ? ns t olz output enable to output in low z (3) 1?1?ns t oe output enable to output valid 1 6 1 8 ns t ohz output enable to output in high z (3) 1618ns t wff write clock to ff or ir ? 6.5 ? 10 ns t ref read clock to ef or or ? 6.5 ? 10 ns t pafa clock to asynchronous programmable almost-full flag ? 16 ? 20 ns t pafs write clock to synchronous programmable almost-full flag ? 6.5 ? 10 ns t paea clock to asynchronous programmable almost-empty flag ? 16 ? 20 ns t paes read clock to synchronous programmable almost-empty flag ? 6.5 ? 10 ns t hf clock to hf ?16?20ns t rcss rcs setup time 3.5 ? 5 ? ns t rcsh rcs hold time 0.5 ? 1 ? ns t rcslz rclk to active from high-z (3) 1 6.5 1 10 ns t rcshz rclk to high-z (3) 1 6.5 1 10 ns t skew1 skew time between rclk and wclk for ef / or and ff / ir 7?9?ns t skew2 skew time between rclk and wclk for pae and paf 10 ? 14 ? ns notes: 1. all ac timings apply to both standard idt mode and first word fall through mode. 2. pulse widths less than minimum values are not allowed. 3. values guaranteed by design, not currently tested. 4. data sheet slow conditions: 85 c, 3.0v. data sheet fast conditions: -40 c, 3.6v. input pulse levels gnd to 3.0v input rise/fall times 3ns input timing reference levels 1.5v output reference levels 1.5v output load see figure 2 ac test conditions figure 2. output load * includes jig and scope capacitances 4680 drw04 330 ? 30pf* 510 ? 3.3v d.u.t.
9 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 functional description timing modes: idt standard vs first word fall through (fwft) mode the idt72v7230/72v7240/72v7250/72v7260/72v7270/72v7280/ 72v7290/72v72100 support two different timing modes of operation: idt standard mode or first word fall through (fwft) mode. the selection of which mode will operate is determined during master reset, by the state of the fwft/si input. if, at the time of master reset, fwft/si is low, then idt standard mode will be selected. this mode uses the empty flag ( ef ) to indicate whether or not there are any words present in the fifo. it also uses the full flag function ( ff ) to indicate whether or not the fifo has any free space for writing. in idt standard mode, every word read from the fifo, including the first, must be requested using the read enable ( ren ) and rclk. if, at the time of master reset, fwft/si is high, then fwft mode will be selected. this mode uses output ready ( or ) to indicate whether or not there is valid data at the data outputs (q n) . it also uses input ready ( ir ) to indicate whether or not the fifo has any free space for writing. in the fwft mode, the first word written to an empty fifo goes directly to q n after three rclk rising edges, ren = low is not necessary. subsequent words must be accessed using the read enable ( ren ) and rclk. various signals, both input and output signals operate differently depending on which timing mode is in effect. idt standard mode in this mode, the status flags, ff , paf , hf , pae , and ef operate in the manner outlined in table 3. to write data into to the fifo, write enable ( wen ) must be low. data presented to the data in lines will be clocked into the fifo on subsequent transitions of the write clock (wclk). after the first write is performed, the empty flag ( ef ) will go high. subsequent writes will continue to fill up the fifo. the programmable almost-empty flag ( pae ) will go high after n + 1 words have been loaded into the fifo, where n is the empty offset value. the default setting for these values are stated in the footnote of table 2. this parameter is also user programmable. see section on programmable flag offset loading. if one continued to write data into the fifo, and we assumed no read operations were taking place, the half-full flag ( hf ) would toggle to low once the 257th word for idt72v7230, 513rd word for idt72v7240, 1,025th word for idt72v7250, 2,049th word for idt72v7260, 4,097th word for idt72v7270, 8,193th word for the idt72v7280, 16,385th word for the idt72v7290 and 32,769th word for the idt72v72100, respectively was written into the fifo. continuing to write data into the fifo will cause the programmable almost-full flag ( paf ) to go low. again, if no reads are performed, the paf will go low after (512-m) writes for the idt72v7230, (1,024-m) writes for the idt72v7240, (2,048-m) writes for the idt72v7250, (4,096-m) writes for the idt72v7260, (8,192-m) writes for the idt72v7270, (16,384-m) writes for the idt72v7280, (32,768-m) writes for the idt72v7290 and (65,536-m) writes for the idt72v72100. the offset ?m? is the full offset value. the default setting for these values are stated in the footnote of table 2. this parameter is also user programmable. see section on programmable flag offset loading. when the fifo is full, the full flag ( ff ) will go low, inhibiting further write operations. if no reads are performed after a reset, ff will go low after d writes to the fifo. d = 512 writes for the idt72v7230, 1,024 writes for the idt72v7240, 2,048 writes for the idt72v7250, 4,096 writes for the idt72v7260, 8,192 writes for the idt72v7270, 16,384 writes for the idt72v7280, 32,768 writes for the idt72v7290, 65,536 writes for the idt72v72100, respectively. if the fifo is full, the first read operation will cause ff to go high. subsequent read operations will cause paf and hf to go high at the conditions described in table 3. if further read operations occur, without write operations, pae will go low when there are n words in the fifo, where n is the empty offset value. continuing read operations will cause the fifo to become empty. when the last word has been read from the fifo, the ef will go low inhibiting further read operations. ren is ignored when the fifo is empty. when configured in idt standard mode, the ef and ff outputs are double register-buffered outputs. relevant timing diagrams for idt standard mode can be found in figure 10,11,12,16 and 18. first word fall through mode (fwft) in this mode, the status flags, ir , paf , hf , pae , and or operate in the manner outlined in table 4. to write data into to the fifo, wen must be low. data presented to the data in lines will be clocked into the fifo on subsequent transitions of wclk. after the first write is performed, the output ready ( or ) flag will go low. subsequent writes will continue to fill up the fifo. pae will go high after n + 2 words have been loaded into the fifo, where n is the empty offset value. the default setting for these values are stated in the footnote of table 2. this parameter is also user programmable. see section on programmable flag offset loading. if one continued to write data into the fifo, and we assumed no read operations were taking place, the hf would toggle to low once the 258th word for the idt72v7230, 514th word for the idt72v7240, 1,026th word for the idt72v7250, 2,050th word for the idt72v7260, 4,098th word for the idt72v7270, 8,194th word for the idt72v7280, 16,386th word for the idt72v7290 and 32,770th word for the idt72v72100, respectively was written into the fifo. continuing to write data into the fifo will cause the paf to go low. again, if no reads are performed, the paf will go low after (513-m) writes for the idt72v7230, (1,025-m) writes for the idt72v7240, (2,049-m) writes for the idt72v7250, (4,097-m) writes for the idt72v7260 and (8,193-m) writes for the idt72v7270, 16,385 writes for the idt72v7280, 32,769 writes for the idt72v7290 and 65,537 writes for the idt72v72100, where m is the full offset value. the default setting for these values are stated in the footnote of table 2. when the fifo is full, the input ready ( ir ) flag will go high, inhibiting further write operations. if no reads are performed after a reset, ir will go high after d writes to the fifo. d = 513 writes for the idt72v7230, 1,025 writes for the idt72v7240, 2,049 writes for the idt72v7250, 4,097 writes for the idt72v7260 and 8,193 writes for the idt72v7270, 16,385 writes for the idt72v7280, 32,769 writes for the idt72v7290, 65,537 writes for the idt72v72100, respectively. note that the additional word in fwft mode is due to the capacity of the memory plus output register. if the fifo is full, the first read operation will cause the ir flag to go low. subsequent read operations will cause the paf and hf to go high at the conditions described in table 4. if further read operations occur, without write operations, the pae will go low when there are n + 1 words in the fifo, where n is the empty offset value. continuing read operations will cause the fifo to become empty. when the last word has been read from the fifo, or will go high inhibiting further read operations. ren is ignored when the fifo is empty. when configured in fwft mode, the or flag output is triple register- buffered, and the ir flag output is double register-buffered. relevant timing diagrams for fwft mode can be found in figure 13, 14,15, 17, and 19.
10 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 programming flag offsets full and empty flag offset values are user programmable. the idt72v7230/ 72v7240/72v7250/72v7260/72v7270/72v7280/72v7290/72v72100 have internal registers for these offsets. there are eight default offset values selectable during master reset. these offset values are shown in table 2. offset values can also be programmed into the fifo in one of two ways; serial or parallel loading method. the selection of the loading method is done using the ld (load) pin. during master reset, the state of the ld input determines whether serial or parallel flag offset programming is enabled. a high on ld during master reset selects serial loading of offset values. a low on ld during master reset selects parallel loading of offset values. in addition to loading offset values into the fifo, it is also possible to read the current offset values. offset values can be read via the parallel output port q 0 -qn, regardless of the programming mode selected (serial or parallel). it is not possible to read the offset values in serial fashion. figure 3, programmable flag offset programming sequence , summaries the control pins and sequence for both serial and parallel programming modes. for a more detailed description, see discussion that follows. the offset registers may be programmed (and reprogrammed) any time after master reset, regardless of whether serial or parallel programming has been selected. valid programming ranges are from 0 to d-1. synchronous vs asynchronous programmable flag timing selection the idt72v7230/72v7240/72v7250/72v7260/72v7270/72v7280/ 72v7290/72v72100 can be configured during the master reset cycle with either synchronous or asynchronous timing for paf and pae flags by use of the pfm pin. if synchronous paf / pae configuration is selected (pfm, high during mrs ), the paf is asserted and updated on the rising edge of wclk only and not rclk. similarly, pae is asserted and updated on the rising edge of rclk only and not wclk. for detail timing diagrams, see figure 23 for synchronous paf timing and figure 24 for synchronous pae timing. if asynchronous paf / pae configuration is selected (pfm, low during mrs ), the paf is asserted low on the low-to-high transition of wclk and paf is reset to high on the low-to-high transition of rclk. similarly, pae is asserted low on the low-to-high transition of rclk. pae is reset to high on the low-to-high transition of wclk. for detail timing diagrams, see figure 25 for asynchronous paf timing and figure 26 for asynchronous pae timing. idt72v7230, 72v7240 ld fsel1 fsel0 offsets n,m lh l511 l l h 255 l l l 127 lh h63 hl l31 hh l15 hl h7 hh h3 ld fsel1 fsel0 program mode h x x serial (3) l x x parallel (4) idt72v7250, 72v7260, 72v7270, 72v7280 ld fsel1 fsel0 offsets n,m h l l 1,023 lh l511 l l h 255 l l l 127 lh h63 hh l31 hl h15 hh h7 ld fsel1 fsel0 program mode h x x serial (3) l x x parallel (4) idt72v7290, 72v72100 ld fsel1 fsel0 offsets n,m l h l 16,383 l l h 8,191 l h h 4,095 h h l 2,047 h l l 1,023 hlh511 hhh255 lll127 ld fsel1 fsel0 program mode h x x serial (3) l x x parallel (4) table 2 default programmable flag offsets notes: 1. n = empty offset for pae . 2. m = full offset for paf . 3. as well as selecting serial programming mode, one of the default values will also be loaded depending on the state of fsel0 & fsel1. 4. as well as selecting parallel programming mode, one of the default values will also be loaded depending on the state of fsel0 & fsel1.
11 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 idt72v7240 idt72v7250 0 1 to n (1) (n+1) to 1,024 1,025 to (2048-(m+1)) (2048-m) to 2,047 2,048 0 1 to n (1) (n+1) to 512 513 to (1,024-(m+1)) (1024-m) to 1,023 1,024 f f p a f h f p a e e f hh hl l hh hl h hh h hh hhlh h h l lhh ll lhh table 3 status flags for idt standard mode number of words in fifo 00 0 1 to n+1 1 to n+1 1 to n+1 (n+2) to 1,025 (n+2) to 2,049 (n+2) to 4,097 1,026 to (2,049-(m+1)) 2,050 to (4,097-(m+1)) 4,098 to (8,193-(m+1)) (2,049-m) to 2,048 (4,097-m) to 4,096 (8,193-m) to 8,192 2,049 4,097 8,193 i r p a f h f p a e o r lh hl h lh hl l lh h hl lhlhl l l lh l hl lh l table 4 status flags for fwft mode number of words in fifo 0 1 to n+1 (n+2) to 513 514 to (1,025-(m+1)) (1,025-m) to 1,024 1,025 4680 drw 05 00 1 to n+1 1 to n+1 (n+2) to 8,193 (n+2) to 16,385 8,194 to (16,385-(m+1)) 16,386 to (32,769-(m+1)) (16,385-m) to 16,384 (32,769-m) to 32,768 16,385 32,769 0 1 to n+1 (n+2) to 32,769 32,770 to (65,537-(m+1)) (65,537-m) to 65,536 65,537 i r p a f h f p a e o r lh hl h lh hl l lh h hl lhlhl l l lhl hl lhl number of words in fifo 0 1 to n+1 (n+2) to 257 258 to (513-(m+1)) (513-m) to 512 513 idt72v7240 idt72v7250 idt72v7260 idt72v7230 idt72v7270 idt72v7280 idt72v7290 idt72v72100 00 1 to n ( 1) 1 to n (1) (n+1) to 8,192 (n+1) to 16,384 8,193 to (16,384-(m+1)) 16,385 to (32,768-(m+1)) (16,384-m) to 16,383 (32,768-m) to 32,767 16,384 32,768 0 1 to n (1) (n+1) to 32,768 32,769 to (65,536-(m+1)) (65,536-m) to 65,535 65,536 idt72v7270 idt72v7280 idt72v7290 idt72v72100 f f p a f h f p a e e f hh hl l hh hl h hh h hh hhlh h h l lh h ll lh h number of words in fifo idt72v7260 0 1 to n (1) (n+1) to 4,096 4,097 to (8,192-(m+1)) (8,192-m) to 8,191 8,192 0 1 to n (1) (n+1) to 2,048 2,049 to (4,096-(m+1)) (4,096-m) to 4,095 4,096 idt72v7230 0 1 to n (1) (n+1) to 256 257 to (512-(m+1)) (512-m) to 511 512 note: 1. see table 2 for values for n, m. note: 1. see table 2 for values for n, m.
12 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 figure 3. programmable flag offset programming sequence notes: 1. the programming method can only be selected at master reset. 2. parallel reading of the offset registers is always permitted regardless of which programming method has been selected. 3. the programming sequence applies to both idt standard and fwft modes. wclk rclk x x xx x x xx l d 0 0 x 1 1 1 0 w e n 0 1 1 0 x 1 1 r e n 1 0 1 x 0 1 1x s e n 1 1 1 x x x 0 no operation write memory read memory no operation parallel write to registers: empty offset full offset idt72v7230 idt72v7240 idt72v7250 idt72v7260 idt72v7270 idt72v7280 idt72v7290 idt72v72100 parallel read from registers: empty offset full offset serial shift into registers: ending with full offset (msb) 18 bits for the idt72v7230 20 bits for the idt72v7240 22 bits for the idt72v7250 24 bits for the idt72v7260 26 bits for the idt72v7270 28 bits for the idt72v7280 30 bits for the idt72v7290 32 bits for the idt72v72100 1 bit for each rising wclk edge starting with empty offset (lsb) sclk x x x x x x 4680 drw06 x
13 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 d/q17 d/q0 d/q8 empty offset register ( pae ) # of bits used 2 3 4 5 6 7 9 10 11 12 13 14 15 16 1st parallel offset write/read cycle 2 3 4 5 6 7 8 12 13 14 15 16 11 interspersed parity 10 1 1 8 d/q35 d/q19 9 d/q17 d/q0 d/q8 full offset register ( paf ) # of bits used 2 3 4 5 6 7 9 10 11 12 13 14 15 16 2nd parallel offset write/read cycle 2 3 4 5 6 7 8 12 13 14 15 16 11 interspersed parity 10 1 1 8 9 x36 bus width non-interspersed parity non-interspersed parity d/q35 d/q19 d/q17 d/q0 d/q16 empty offset (lsb) register ( pae ) data inputs/outputs # of bits used 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1st parallel offset write/read cycle 2nd parallel offset write/read cycle data inputs/outputs 1 2 3 4 5 6 7 8 10 11 12 13 14 15 9 full offset (lsb) register ( paf ) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 10 11 12 13 14 15 9 non-interspersed parity interspersed parity d/q0 d/q8 d/q8 x18 bus width 16 16 d/q17 d/q16 # of bits used: 09 bits for the idt72v7230 10 bits for the idt72v7240 11 bits for the idt72v7250 12 bits for the idt72v7260 13 bits for the idt72v7270 14 bits for the idt72v7280 15 bits for the idt72v7290 16 bits for the idt72v72100 note: all unused input bits are don?t care. 4680 drw07 d/q17 d/q0 d/q8 empty offset register ( pae ) # of bits used 2 3 4 5 6 7 9 10 11 12 13 14 15 16 1st parallel offset write/read cycle 2 3 4 5 6 7 8 12 13 14 15 16 11 interspersed parity 10 1 1 8 d/q71 d/q19 9 d/q17 d/q0 d/q8 full offset register ( paf ) # of bits used 2 3 4 5 6 7 9 10 11 12 13 14 15 16 2nd parallel offset write/read cycle 2 3 4 5 6 7 8 12 13 14 15 16 11 interspersed parity 10 1 1 8 9 x72 bus width non-interspersed parity non-interspersed parity d/q71 d/q19 figure 3. programmable flag offset programming sequence (continued)
14 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 functional description (continued) serial programming mode if serial programming mode has been selected, as described above, then programming of pae and paf values can be achieved by using a combination of the ld , sen , sclk and si input pins. programming pae and paf proceeds as follows: when ld and sen are set low, data on the si input are written, one bit for each sclk rising edge, starting with the empty offset lsb and ending with the full offset msb. a total of 18 bits for the idt72v7230, 20 bits for the idt72v7240, 22 bits for the idt72v7250, 24 bits for the idt72v7260, 26 bits for the idt72v7270, 28 bits for the idt72v7280, 30 bits for the idt72v7290 and 32 bits for the idt72v72100. see figure 20, serial loading of programmable flag registers , for the timing diagram for this mode. using the serial method, individual registers cannot be programmed selectively. pae and paf can show a valid status only after the complete set of bits (for all offset registers) has been entered. the registers can be reprogrammed as long as the complete set of new offset bits is entered. when ld is low and sen is high, no serial write to the registers can occur. write operations to the fifo are allowed before and during the serial programming sequence. in this case, the programming of all offset bits does not have to occur at once. a select number of bits can be written to the si input and then, by bringing ld and sen high, data can be written to fifo memory via d n by toggling wen . when wen is brought high with ld and sen restored to a low, the next offset bit in sequence is written to the registers via si. if an interruption of serial programming is desired, it is sufficient either to set ld low and deactivate sen or to set sen low and deactivate ld . once ld and sen are both restored to a low level, serial offset programming continues. from the time serial programming has begun, neither programmable flag will be valid until the full set of bits required to fill all the offset registers has been written. measuring from the rising sclk edge that achieves the above criteria; paf will be valid after three more rising wclk edges plus t paf , pae will be valid after the next three rising rclk edges plus t pae . it is only possible to read the flag offset values via the parallel output port qn. parallel mode if parallel programming mode has been selected, as described above, then programming of pae and paf values can be achieved by using a combination of the ld , wclk, wen and d n input pins. programming pae and paf proceeds as follows: ld and wen must be set low. for x72, x36 or x18 bit input bus widths, data on the inputs d n are written into the empty offset register on the first low-to-high transition of wclk. upon the second low-to-high transition of wclk, data are written into the full offset register. the third transition of wclk writes, once again, to the empty offset register. see figure 3, programmable flag offset programming sequence . see figure 21, parallel loading of programmable flag registers , for the timing diagram for this mode. the act of writing offsets in parallel employs a dedicated write offset register pointer. the act of reading offsets employs a dedicated read offset register pointer. the two pointers operate independently; however, a read and a write should not be performed simultaneously to the offset registers. a master reset initializes both pointers to the empty offset register. a partial reset has no effect on the position of these pointers. write operations to the fifo are allowed before and during the parallel programming sequence. in this case, the programming of all offset registers does not have to occur at one time. one offset register can be written and then by bringing ld high, write operations can be redirected to the fifo memory. when ld is set low again, and wen is low, the next offset register in sequence is written to. as an alternative to holding wen low and toggling ld , parallel programming can also be interrupted by setting ld low and toggling wen . note that the status of a programmable flag ( pae or paf ) output is invalid during the programming process. from the time parallel programming has begun, a programmable flag output will not be valid until the appropriate offset word has been written to the register pertaining to that flag. measuring from the rising wclk edge that achieves the above criteria; paf will be valid after two more rising wclk edges plus t paf , pae will be valid after the next two rising rclk edges plus t pae plus t skew2 . the act of reading the offset registers employs a dedicated read offset register pointer. the contents of the offset registers can be read on the q 0 -q 16 pins when ld is set low and ren is set low. for x72, x36 or x18 output bus width, data are read via q 0 -q 16 from the empty offset register on the first low-to-high transition of rclk. upon the second low-to-high transition of rclk, data are read from the full offset register. the third transition of rclk reads, once again, from the empty offset register. see figure 3, program- mable flag offset programming sequence . see figure 22, parallel read of programmable flag registers , for the timing diagram for this mode. it is permissible to interrupt the offset register read sequence with reads or writes to the fifo. the interruption is accomplished by deasserting ren , ld , or both together. when ren and ld are restored to a low level, reading of the offset registers continues where it left off. it should be noted, and care should be taken from the fact that when a parallel read of the flag offsets is performed, the data word that was present on the output lines qn will be overwritten. parallel reading of the offset registers is always permitted regardless of which timing mode (idt standard or fwft modes) has been selected. retransmit operation the retransmit operation allows data that has already been read to be accessed again. there are 2 modes of retransmit operation, normal latency and zero latency. there are two stages to retransmit: first, a setup procedure that resets the read pointer to the first location of memory, then the actual retransmit, which consists of reading out the memory contents, starting at the beginning of memory. retransmit setup is initiated by holding rt low during a rising rclk edge. ren and wen must be high before bringing rt low. when zero latency is utilized, ren does not need to be high before bringing rt low. at least two words, but no more than d - 2 words should have been written into the fifo, and read from the fifo, between reset (master or partial) and the time of retransmit setup. d = 512 for the idt72v7230, 1,024 for the idt72v7240, 2,048 for the idt72v7250, 4,096 for the idt72v7260, 8,192 for the idt72v7270, 16,384 for the idt72v7280, 32,768 for the idt72v7290 and 65,536 for the idt72v72100. in fwft mode, d = 513 for the idt72v7230, 1,025 for the idt72v7240, 2,049 for the idt72v7250, 4,097 for the idt72v7260, 8,193 for the idt72v7270, 16,385 for the idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100. if idt standard mode is selected, the fifo will mark the beginning of the retransmit setup by setting ef low. the change in level will only be noticeable if ef was high before setup. during this period, the internal read pointer is initialized to the first location of the ram array. when ef goes high, retransmit setup is complete and read operations may begin starting with the first location in memory. since idt standard mode is selected, every word read including the first word following retransmit setup requires a low on ren to enable the rising edge of rclk. see figure 16, retransmit timing (idt standard mode) , for the relevant timing diagram.
15 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 if fwft mode is selected, the fifo will mark the beginning of the retransmit setup by setting or high. during this period, the internal read pointer is set to the first location of the ram array. when or goes low, retransmit setup is complete; at the same time, the contents of the first location appear on the outputs. since fwft mode is selected, the first word appears on the outputs, no low on ren is necessary. reading all subsequent words requires a low on ren to enable the rising edge of rclk. see figure 17, retransmit timing (fwft mode) , for the relevant timing diagram. for either idt standard mode or fwft mode, updating of the pae , hf and paf flags begin with the rising edge of rclk that rt is setup. pae is synchronized to rclk, thus on the second rising edge of rclk after rt is setup, the pae flag will be updated. hf is asynchronous, thus the rising edge of rclk that rt is setup will update hf . paf is synchronized to wclk, thus the second rising edge of wclk that occurs t skew after the rising edge of rclk that rt is setup will update paf . rt is synchronized to rclk. the retransmit function has the option of two modes of operation, either ?normal latency? or ?zero latency?. figure 16 and figure 17 mentioned previously, relate to ?normal latency?. figure 18 and figure 19 show ?zero latency? retransmit operation. zero latency basically means that the first data word to be retransmitted, is placed onto the output register with respect to the rclk pulse that initiated the retransmit.
16 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 signal description inputs: data in (d 0 - d n ) data inputs for 72-bit wide data (d 0 - d 71 ), data inputs for 36-bit wide data (d 0 - d 35 ) or data inputs for 18-bit wide data (d 0 - d 17 ). controls: master reset ( mrs ) a master reset is accomplished whenever the mrs input is taken to a low state. this operation sets the internal read and write pointers to the first location of the ram array. pae will go low, paf will go high, and hf will go high. if fwft/si is low during master reset then the idt standard mode, along with ef and ff are selected. ef will go low and ff will go high. if fwft/si is high, then the first word fall through mode (fwft), along with ir and or , are selected. or will go high and ir will go low. all control settings such as ow, iw, bm, be , rm, pfm and ip are defined during the master reset cycle. during a master reset, the output register is initialized to all zeroes. a master reset is required after power up, before a write operation can take place. mrs is asynchronous. see figure 8, master reset timing , for the relevant timing diagram. partial reset ( prs ) a partial reset is accomplished whenever the prs input is taken to a low state. as in the case of the master reset, the internal read and write pointers are set to the first location of the ram array, pae goes low, paf goes high, and hf goes high. whichever mode is active at the time of partial reset, idt standard mode or first word fall through, that mode will remain selected. if the idt standard mode is active, then ff will go high and ef will go low. if the first word fall through mode is active, then or will go high, and ir will go low. following partial reset, all values held in the offset registers remain unchanged. the programming method (parallel or serial) currently active at the time of partial reset is also retained. the output register is initialized to all zeroes. prs is asynchronous. a partial reset is useful for resetting the device during the course of operation, when reprogramming programmable flag offset settings may not be convenient. see figure 9, partial reset timing , for the relevant timing diagram. retransmit ( rt ) the retransmit operation allows data that has already been read to be accessed again. there are 2 modes of retransmit operation, normal latency and zero latency. there are two stages to retransmit: first, a setup procedure that resets the read pointer to the first location of memory, then the actual retransmit, which consists of reading out the memory contents, starting at the beginning of the memory. retransmit setup is initiated by holding rt low during a rising rclk edge. ren and wen must be high before bringing rt low. when zero latency is utilized, ren does not need to be high before bringing rt low. if idt standard mode is selected, the fifo will mark the beginning of the retransmit setup by setting ef low. the change in level will only be noticeable if ef was high before setup. during this period, the internal read pointer is initialized to the first location of the ram array. when ef goes high, retransmit setup is complete and read operations may begin starting with the first location in memory. since idt standard mode is selected, every word read including the first word following retransmit setup requires a low on ren to enable the rising edge of rclk. see figure 16, retransmit timing (idt standard mode) , for the relevant timing diagram. if fwft mode is selected, the fifo will mark the beginning of the retransmit setup by setting or high. during this period, the internal read pointer is set to the first location of the ram array. when or goes low, retransmit setup is complete; at the same time, the contents of the first location appear on the outputs. since fwft mode is selected, the first word appears on the outputs, no low on ren is necessary. reading all subsequent words requires a low on ren to enable the rising edge of rclk. see figure 17, retransmit timing (fwft mode) , for the relevant timing diagram. in retransmit operation, zero latency mode can be selected using the retransmit mode (rm) pin during a master reset. this can be applied to both idt standard mode and fwft mode. note, the read chip select ( rcs ) input must be low during retransmit. the rcs input enables/disables the ren input. first word fall through/serial in ( fwft/si ) this is a dual purpose pin. during master reset, the state of the fwft/ si input determines whether the device will operate in idt standard mode or first word fall through (fwft) mode. if, at the time of master reset, fwft/si is low, then idt standard mode will be selected. this mode uses the empty flag ( ef ) to indicate whether or not there are any words present in the fifo memory. it also uses the full flag function ( ff ) to indicate whether or not the fifo memory has any free space for writing. in idt standard mode, every word read from the fifo, including the first, must be requested using the read enable ( ren ) and rclk. if, at the time of master reset, fwft/si is high, then fwft mode will be selected. this mode uses output ready ( or ) to indicate whether or not there is valid data at the data outputs (q n) . it also uses input ready ( ir ) to indicate whether or not the fifo memory has any free space for writing. in the fwft mode, the first word written to an empty fifo goes directly to q n after three rclk rising edges, ren = low is not necessary. subsequent words must be accessed using the read enable ( ren ) and rclk. after master reset, fwft/si acts as a serial input for loading pae and paf offsets into the programmable registers. the serial input function can only be used when the serial loading method has been selected during master reset. serial programming using the fwft/si pin functions the same way in both idt standard and fwft modes. write clock (wclk ) a write cycle is initiated on the rising edge of the wclk input. data setup and hold times must be met with respect to the low-to-high transition of the wclk. it is permissible to stop the wclk. note that while wclk is idle, the ff / ir , paf and hf flags will not be updated. (note that wclk is only capable of updating hf flag to low.) the write and read clocks can either be independent or coincident. write enable ( wen ) when the wen input is low, data may be loaded into the fifo ram array on the rising edge of every wclk cycle if the device is not full. data is stored in the ram array sequentially and independently of any ongoing read operation. when wen is high, no new data is written in the ram array on each wclk cycle. to prevent data overflow in the idt standard mode, ff will go low, inhibiting further write operations. upon the completion of a valid read cycle,
17 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 ff will go high allowing a write to occur. the ff is updated by two wclk cycles + t skew after the rclk cycle. to prevent data overflow in the fwft mode, ir will go high, inhibiting further write operations. upon the completion of a valid read cycle, ir will go low allowing a write to occur. the ir flag is updated by two wclk cycles + t skew after the valid rclk cycle. wen is ignored when the fifo is full in either fwft or idt standard mode. read clock (rclk) a read cycle is initiated on the rising edge of the rclk input. data can be read on the outputs, on the rising edge of the rclk input. it is permissible to stop the rclk. note that while rclk is idle, the ef / or , pae and hf flags will not be updated. (note that rclk is only capable of updating the hf flag to high.) the write and read clocks can be independent or coincident. read enable ( ren ) when read enable is low, data is loaded from the ram array into the output register on the rising edge of every rclk cycle if the device is not empty. when the ren input is high, the output register holds the previous data and no new data is loaded into the output register. the data outputs q 0 -q n maintain the previous data value. in the idt standard mode, every word accessed at q n , including the first word written to an empty fifo, must be requested using ren provided that rcs is low. when the last word has been read from the fifo, the empty flag ( ef ) will go low, inhibiting further read operations. ren is ignored when the fifo is empty. once a write is performed, ef will go high allowing a read to occur. the ef flag is updated by two rclk cycles + t skew after the valid wclk cycle. in the fwft mode, the first word written to an empty fifo automatically goes to the outputs q n , on the third valid low-to-high transition of rclk + t skew after the first write. ren and rcs do not need to be asserted low. in order to access all other words, a read must be executed using ren and rcs must be enabled low. the rclk low-to-high transition after the last word has been read from the fifo, output ready ( or ) will go high with a true read (rclk with ren = low; rcs = low), inhibiting further read operations. ren is ignored when the fifo is empty. serial clock ( sclk ) during serial loading of the programmable flag offset registers, a rising edge on the sclk input is used to load serial data present on the si input provided that the sen input is low. serial enable ( sen ) the sen input is an enable used only for serial programming of the offset registers. the serial programming method must be selected during master reset. sen is always used in conjunction with ld . when these lines are both low, data at the si input can be loaded into the program register one bit for each low-to-high transition of sclk. when sen is high, the programmable registers retains the previous settings and no offsets are loaded. sen functions the same way in both idt standard and fwft modes. output enable ( oe ) when output enable is enabled (low), the parallel output buffers receive data from the output register. when oe is high, the output data bus (q n ) goes into a high impedance state. note, during a master or partial reset rcs can be high or low, oe is the only input that can place the output bus into high- impedance. read chip select ( rcs ) the read chip select input provides synchronous control of the read output port. when rcs goes low, the next rising edge of rclk causes the qn outputs to go to the low z state. when rcs goes high, the next rclk rising edge causes the qn outputs to return to high z. during a master or partial reset the rcs input can be high or low. oe provides high-impedance control of the data outputs. if oe is low the data outputs will be low-impedance regardless of rcs until the first rising edge of rclk after reset is complete. then if rcs is high the data outputs will go to high-impedance. during the time while rcs is high (disabled) all read operations are ignored. that is, the ren input is disabled and data is not clocked from the ram array to the output register. the rcs input does not effect the operation of the flags. for example, when the first word is written to an empty fifo, the ef will still go from low to high based on a rising edge of rclk , regardless of the state of the rcs input. also, when operating the fifo in fwft mode the first word written to an empty fifo will still be clocked through to the output register based on rclk, regardless of the state of rcs . the rcs pin must also be active (low) in order to perform a retransmit. see figure 12 for read cycle and read chip select timing (idt standard mode). see figure 15 for read cycle and read chip select timing (first word fall through mode). load ( ld ) this is a dual purpose pin. during master reset, the state of the ld input, along with fsel0 and fsel1, determines one of eight default offset values for the pae and paf flags, along with the method by which these offset registers can be programmed, parallel or serial (see table 2). after master reset, ld enables write operations to and read operations from the offset registers. only the offset loading method currently selected can be used to write to the registers. offset registers can be read only in parallel. after master reset, the ld pin is used to activate the programming process of the flag offset values pae and paf . pulling ld low will begin a serial loading or parallel load or read of these offset values. bus-matching (bm, iw, ow) the pins bm, iw and ow are used to define the input and output bus widths. during master reset, the state of these pins is used to configure the device bus sizes. see table 1 for control settings. all flags will operate on the word/byte size boundary as defined by the selection of bus width. see figure 4 for bus- matching byte arrangement . big-endian/little-endian ( be ) during master reset, a low on be will select big-endian operation. a high on be during master reset will select little-endian format. this function is useful when the following input to output bus widths are implemented: x72 to x36, x72 to x18, x36 to x72 and x18 to x72. if big-endian mode is selected, then the most significant byte (word) of the long word written into the fifo will be read out of the fifo first, followed by the least significant long word. if little- endian format is selected, then the least significant word of the long word written into the fifo will be read out first, followed by the most significant word. the mode desired is configured during master reset by the state of the big-endian ( be ) pin. see figure 4 for bus-matching byte arrangement . programmable flag mode (pfm) during master reset, a low on pfm will select asynchronous program- mable flag timing mode. a high on pfm will select synchronous programmable
18 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 flag timing mode. if asynchronous paf / pae configuration is selected (pfm, low during mrs ), the pae is asserted low on the low-to-high transition of rclk. pae is reset to high on the low-to-high transition of wclk. similarly, the paf is asserted low on the low-to-high transition of wclk and paf is reset to high on the low-to-high transition of rclk. if synchronous pae / paf configuration is selected (pfm, high during mrs) , the pae is asserted and updated on the rising edge of rclk only and not wclk. similarly, paf is asserted and updated on the rising edge of wclk only and not rclk. the mode desired is configured during master reset by the state of the programmable flag mode (pfm) pin. interspersed parity (ip) during master reset, a low on ip will select non-interspersed parity mode. a high will select interspersed parity mode. the ip bit function allows the user to select the parity bit in the long word loaded into the parallel port (d 0 -dn) when programming the flag offsets. if interspersed parity mode is selected, then the fifo will assume that the parity bits are located in bit position d 8 , d 17 , d 26 , d 35, d 44 , d 53 , d 62 and d 71 during the parallel programming of the flag offsets. if non-interspersed parity mode is selected, then d 8 , d 17 and d 28 are is assumed to be valid bits and d 64 , d 65 , d 66, d 67 , d 68 , d 69 , d 70 and d 71 are ignored. ip mode is selected during master reset by the state of the ip input pin. outputs: full flag ( ff / ir ) this is a dual purpose pin. in idt standard mode, the full flag ( ff ) function is selected. when the fifo is full, ff will go low, inhibiting further write operations. when ff is high, the fifo is not full. if no reads are performed after a reset (either mrs or prs ), ff will go low after d writes to the fifo (d = 512 for the idt72v7230, 1,024 for the idt72v7240, 2,048 for the idt72v7250, 4,096 for the idt72v7260, 8,192 for the idt72v7270, 16,384 for the idt72v7280, 32,768 for the idt72v7290 and 65,536 for the idt72v72100). see figure10, write cycle and full flag timing (idt standard mode) , for the relevant timing information. in fwft mode, the input ready ( ir ) function is selected. ir goes low when memory space is available for writing in data. when there is no longer any free space left, ir goes high, inhibiting further write operations. if no reads are performed after a reset (either mrs or prs ), ir will go high after d writes to the fifo (d = 513 for the idt72v7230, 1,025 for the idt72v7240, 2,049 for the idt72v7250, 4,097 for the idt72v7260, 8,193 for the idt72v7270, 16,385 for the idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100). see figure 13, write timing (fwft mode) , for the relevant timing information. the ir status not only measures the contents of the fifo memory, but also counts the presence of a word in the output register. thus, in fwft mode, the total number of writes necessary to deassert ir is one greater than needed to assert ff in idt standard mode. ff / ir is synchronous and updated on the rising edge of wclk. ff / ir are double register-buffered outputs. empty flag ( ef / or ) this is a dual purpose pin. in the idt standard mode, the empty flag ( ef ) function is selected. when the fifo is empty, ef will go low, inhibiting further read operations. when ef is high, the fifo is not empty. see figure 11, read cycle, output enable, empty flag and first word latency timing (idt standard mode) , for the relevant timing information. in fwft mode, the output ready ( or ) function is selected. or goes low at the same time that the first word written to an empty fifo appears valid on the outputs. or stays low after the rclk low to high transition that shifts the last word from the fifo memory to the outputs. or goes high only with a true read (rclk with ren = low). the previous data stays at the outputs, indicating the last word was read. further data reads are inhibited until or goes low again. see figure 10, read timing (fwft mode) , for the relevant timing information. ef / or is synchronous and updated on the rising edge of rclk. in idt standard mode, ef is a double register-buffered output. in fwft mode, or is a triple register-buffered output. programmable almost-full flag ( paf ) the programmable almost-full flag ( paf ) will go low when the fifo reaches the almost-full condition. in idt standard mode, if no reads are performed after reset ( mrs ), paf will go low after (d - m) words are written to the fifo. the paf will go low after (512-m) writes for the idt72v7230, (1,024-m) writes for the idt72v7240, (2,048-m) writes for the idt72v7250, (4,096-m) writes for the idt72v7260, (8,192-m) writes for the idt72v7270, (16,384-m) writes for the idt72v7280, (32,768-m) writes for the idt72v7290, and (65,536-m) writes for the idt72v72100. the offset ?m? is the full offset value. the default setting for this value is stated in the footnote of table 1. in fwft mode, the paf will go low after (513-m) writes for the idt72v7230, (1,025-m) writes for the idt72v7240, (2,049-m) writes for the idt72v7250, (4,097-m) writes for the idt72v7260 and (8,193-m) writes for the idt72v7270, (16,385-m) writes for the idt72v7280, (32,769-m) writes for the idt72v7290 and (65,537-m) writes for the idt72v72100, where ?m? is the full offset value. the default setting for this value is stated in table 2. see figure 23, synchronous programmable almost-full flag timing (idt standard and fwft modes) , for the relevant timing information. if asynchronous paf configuration is selected, the paf is asserted low on the low-to-high transition of the write clock (wclk). paf is reset to high on the low-to-high transition of the read clock (rclk). if synchronous paf configuration is selected, the paf is updated on the rising edge of wclk. see figure 25, asynchronous almost-full flag timing (idt standard and fwft modes) . programmable almost-empty flag ( pae ) the programmable almost-empty flag ( pae ) will go low when the fifo reaches the almost-empty condition. in idt standard mode, pae will go low when there are n words or less in the fifo. the offset ?n? is the empty offset value. the default setting for this value is stated in the footnote of table 1. in fwft mode, the pae will go low when there are n+1 words or less in the fifo. the default setting for this value is stated in table 2. see figure 24, synchronous programmable almost-empty flag timing (idt standard and fwft modes) , for the relevant timing information. if asynchronous pae configuration is selected, the pae is asserted low on the low-to-high transition of the read clock (rclk). pae is reset to high on the low-to-high transition of the write clock (wclk). if synchronous pae configuration is selected, the pae is updated on the rising edge of rclk. see figure 26, asynchronous programmable almost-empty flag timing (idt standard and fwft modes) . half-full flag ( hf ) this output indicates a half-full fifo. the rising wclk edge that fills the fifo beyond half-full sets hf low. the flag remains low until the difference between the write and read pointers becomes less than or equal to half of the total depth of the device; the rising rclk edge that accomplishes this condition sets hf high.
19 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 in idt standard mode, if no reads are performed after reset ( mrs or prs ), hf will go low after (d/2 + 1) writes to the fifo, where d = 512 for the idt72v7230, 1,024 for the idt72v7240, 2,048 for the idt72v7250, 4,096 for the idt72v7260, 8,192 for the idt72v7270, 16,384 for the idt72v7280, 32,768 for the idt72v7290 and 65,536 for the idt72v72100. in fwft mode, if no reads are performed after reset ( mrs or prs ), hf will go low after (d-1/2 + 2) writes to the fifo, where d = 513 for the idt72v7230, 1,025 for the idt72v7240, 2,049 for the idt72v7250, 4,097 for the idt72v7260, 8,193 for the idt72v7270, 16,385 for the idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100. see figure 27, half-full flag timing (idt standard and fwft modes) , for the relevant timing information. because hf is updated by both rclk and wclk, it is considered asynchronous. data outputs (q 0 -q n ) (q 0 -q 71 ) are data outputs for 72-bit wide data, (q 0 - q 35 ) are data outputs for 36-bit wide data or (q 0 -q 17 ) are data outputs for 18-bit wide data.
20 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 d71-d54 d53-d36 d35-d18 d17-d0 a a a d a c b b b c b d c c c a d d d b (a) x72 input to x72 output (b) x72 input to x36 output - big-endian (c) x72 input to x36 output - little-endian (d) x72 input to x18 output - big-endian write to fifo read from fifo 1st: read from fifo b e bm iw ow byte order on input port: 2nd: read from fifo 3rd: read from fifo 4th: read from fifo 1st: read from fifo 1st: read from fifo 2nd: read from fifo 2nd: read from fifo d c (e) x72 input to x18 output - little-endian 1st: read from fifo a b 2nd: read from fifo 3rd: read from fifo 4th: read from fifo 4680 drw08 byte order on output port: l h l l h h l l l h l h h h l h x l x x b e bm iw ow b e bm iw ow b e bm iw ow b e bm iw ow q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 figure 4. bus-matching byte arrangement
21 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 a a d a c b b c b d c d d71-d54 d53-d36 d35-d18 d17-d0 (a) x36 input to x72 output - big-endian read from fifo 1st: write to fifo byte order on input port: 2nd: write to fifo 3rd: write to fifo 4th: write to fifo 1st: write to fifo 2nd: write to fifo 4680 drw09 byte order on output port: c d a b (b) x36 input to x72 output - little-endian read from fifo b e bm iw ow h h h l byte order on input port: abcd (a) x18 input to x72 output - big-endian read from fifo b e bm iw ow l h h h byte order on output port: d c b a (b) x18 input to x72 output - little-endian read from fifo b e bm iw ow h h h h b e bm iw ow l h h l d71-d54 d53-d36 d35-d18 d17-d0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 q71-q54 q53-q36 q35-q18 q17-q0 figure 4. bus-matching byte arrangement (continued)
22 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 t tck t 4 t 2 t 3 t 1 t ds t dh tdo tdo tdi/ tms tck trst t 5 t do notes to diagram: t1 = t tcklow t2 = t tckhigh t3 = t tckfall t4 = t tckrise t5 = trst (reset pulse width) t6 = trsr (reset recovery) 4680 drw10 t 6 figure 5. standard jtag timing system interface parameters parameter symbol test conditions min. max. units jtag clock input period t tck - 100 - ns jtag clock high t tckhigh -40-ns jtag clock low t tcklow -40-ns jtag clock rise time t tckrise --5 (1) ns jtag clock fall time t tckfall --5 (1) ns jtag reset t rst -50-ns jtag reset recovery t rsr -50-ns jtag ac electrical characteristics (v cc = 3.3v 5%; tcase = 0 c to +85 c) idt72v7230 idt72v7240 idt72v7250 idt72v7260 idt72v7270 idt72v7280 idt72v7290 idt72v72100 parameter symbol test conditions min. max. units data output t do = max ? 20 ns data output hold t doh (1) 0?ns data input t ds t rise=3ns 10 ? ns t dh t fall=3ns 10 ? note: 1. 50pf loading on external output signals. jtag timing specification note: 1. guaranteed by design.
23 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 jtag interface five additional pins (tdi, tdo, tms, tck and trst ) are provided to support the jtag boundary scan interface. the idt72v7230/72v7240/ 72v7250/72v7260/72v7270/72v7280/72v7290/72v72100 incorporates the necessary tap controller and modified pad cells to implement the jtag facility. note that idt provides appropriate boundary scan description language program files for these devices. the standard jtag interface consists of four basic elements: ? ? ? ? ? test access port (tap) ? ? ? ? ? tap controller ? ? ? ? ? instruction register (ir) ? ? ? ? ? data register port (dr) the following sections provide a brief description of each element. for a complete description refer to the ieee standard test access port specification (ieee std. 1149.1-1990). the figure below shows the standard boundary-scan architecture t a p tap cont- roller mux deviceid reg. boundary scan reg. bypass reg. clkdr, shiftdr updatedr tdo tdi tms tclk trst clklr, shiftlr updatelr instruction register instruction decode control signals 4680 drw11 figure 6. boundary scan architecture test access port (tap) the tap interface is a general-purpose port that provides access to the internal of the processor. it consists of four input ports (tclk, tms, tdi, trst ) and one output port (tdo). the tap controller the tap controller is a synchronous finite state machine that responds to tms and tclk signals to generate clock and control signals to the instruction and data registers for capture and update of data.
24 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 test-logic reset run-test/ idle 1 0 0 select- dr-scan select- ir-scan 1 1 1 capture-ir 0 capture-dr 0 0 exit1-dr 1 pause-dr 0 exit2-dr 1 update-dr 1 exit1-ir 1 exit2-ir 1 update-ir 1 1 0 1 1 1 4680 drw12 0 shift-dr 0 0 0 shift-ir 0 0 pause-ir 0 1 input = tms 0 0 1 figure 7. tap controller state diagram refer to the ieee standard test access port specification (ieee std. 1149.1) for the full state diagram all state transitions within the tap controller occur at the rising edge of the tclk pulse. the tms signal level (0 or 1) determines the state progression that occurs on each tclk rising edge. the tap controller takes precedence over the fifo memory and must be reset after power up of the device. see trst description for more details on tap controller reset. capture-dr data is loaded from the parallel input pins or core outputs into the data register. shift-dr the previously captured data is shifted in serially, lsb first at the rising edge of tclk in the tdi/tdo path and shifted out serially, lsb first at the falling edge of tclk towards the output. update-dr the shifting process has been completed. the data is latched into their parallel outputs in this state to be accessed through the internal bus. exit1-dr / exit2-dr this is a temporary controller state. if tms is held high, a rising edge applied to tck while in this state causes the controller to enter the update-dr state. this terminates the scanning process. all test data registers selected by the current instruction retain their previous state unchanged. pause-dr this controller state allows shifting of the test data register in the serial path between tdi and tdo to be temporarily halted. all test data registers selected by the current instruction retain their previous state unchanged. capture-ir, shift-ir and update-ir, exit-ir and pause-ir are similar to data registers. these instructions operate on the instruction registers. notes: 1. five consecutive tck cycles with tms = 1 will reset the tap. 2. tap controller does not automatically reset upon power-up. the user must provide a reset to the tap controller (either by trst or tms). 3. tap controller must be reset before normal fifo operations can begin.
25 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 the instruction register the instruction register allows an instruction to be shifted in serially into the processor at the rising edge of tclk. the instruction is used to select the test to be performed, or the test data register to be accessed, or both. the instruction shifted into the register is latched at the completion of the shifting process when the tap controller is at update- ir state. the instruction register must contain 4 bit instruction register-based cells which can hold instruction data. these mandatory cells are located nearest the serial outputs they are the least significant bits. test data register the test data register contains three test data registers: the bypass, the boundary scan register and device id register. these registers are connected in parallel between a common serial input and a common serial data output. the following sections provide a brief description of each element. for a complete description, refer to the ieee standard test access port specification (ieee std. 1149.1-1990). test bypass register the register is used to allow test data to flow through the device from tdi to tdo. it contains a single stage shift register for a minimum length in serial path. when the bypass register is selected by an instruction, the shift register stage is set to a logic zero on the rising edge of tclk when the tap controller is in the capture-dr state. the operation of the bypass register should not have any effect on the operation of the device in response to the bypass instruction. the boundary-scan register the boundary scan register allows serial data tdi be loaded in to or read out of the processor input/output ports. the boundary scan register is a part of the ieee 1149.1-1990 standard jtag implementation. the device identification register the device identification register is a read only 32-bit register used to specify the manufacturer, part number and version of the processor to be determined through the tap in response to the idcode instruction. idt jedec id number is 0xb3. this translates to 0x33 when the parity is dropped in the 11-bit manufacturer id field. for the idt72v7230/72v7240/72v7250/72v7260/72v7270/72v7280/ 72v7290/72v72100, the part number field contains the following values: device part# field idt72v7230 0x57 idt72v7240 0x51 idt72v7250 0x52 idt72v7260 0x53 idt72v7270 0x54 idt72v7280 0x55 idt72v7290 0x56 idt72v72100 0x50 idt72v7230/40/50/60/70/80/90/100 jtag device identification register 31(msb) 28 27 12 11 1 0(lsb) version (4 bits) part number (16-bit) manufacturer id (11-bit) 0x0 0x33 1 jtag instruction register the instruction register allows instruction to be serially input into the device when the tap controller is in the shift-ir state. the instruction is decoded to perform the following: ? ? ? ? ? select test data registers that may operate while the instruction is current. the other test data registers should not interfere with chip operation and the selected data register. ? ? ? ? ? define the serial test data register path that is used to shift data between tdi and tdo during data register scanning. the instruction register is a 4 bit field (i.e.ir3, ir2, ir1, ir0) to decode 16 different possible instructions. instructions are decoded as follows. jtag instruction register decoding hex instruction function value 0x00 extest select boundary scan register 0x02 idcode select chip identification data register 0x01 sample/preload select boundary scan register 0x03 hi-z jtag 0x0f bypass select bypass register the following sections provide a brief description of each instruction. for a complete description refer to the ieee standard test access port specification (ieee std. 1149.1-1990). extest the mandatory extest instruction is provided for external circuity and board level interconnection check. idcode this instruction is provided to select device identification register to read out manufacture?s identity, part number and version number. sample/preload the mandatory sample/preload instruction allows data values to be loaded onto the latched parallel outputs of the boundary-scan shift register prior to selection of the boundary-scan test instruction. the sample instruction allows a snapshot of data flowing from the system pins to the on-chip logic or vice versa. high z this instruction places all the output pins on the device into a high impedance state. bypass the bypass instruction contains a single shift-register stage and is set to provide a minimum-length serial path between the tdi and the tdo pins of the device when no test operation of the device is required.
26 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 t rs mrs t rsr ren t rss fwft/si 4680 drw13 t rsr t rsr wen fsel0, fsel1 rt sen t rsf t rsf oe = high oe = low pae paf , hf q 0 - q n (1) t rsf ef / or ff / ir t rsf t rsf if fwft = high, or = high if fwft = low, ef = low if fwft = low, ff = high if fwft = high, ir = low t rss t rss t rss t rss bm, ow, iw be rm pfm ip t rss ld t rsr t rss t rss t rss t rss t rss t rss figure 8. master reset timing note: 1. during master reset the high-impedance control of the qn data outputs is provided by oe only, rcs can be high or low until the first rising edge of rclk after master reset is complete.
27 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 t rs prs t rsr ren t rss 4680 drw 14 t rsr wen rt sen t rsf t rsf oe = high oe = low pae paf , hf q 0 - q n (1) t rsf ef / or ff / ir t rsf t rsf if fwft = high, or = high if fwft = low, ef = low if fwft = low, ff = high if fwft = high, ir = low t rss t rss t rss figure 9. partial reset timing note: 1. during partial reset the high-impedance control of the qn data outputs is provided by oe only, rcs can be high or low until the first rising edge of rclk after partial reset is complete.
28 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 d 0 - d n wen rclk ren t enh t enh q 0 - q n data read next data read t skew1 (1) 4680 drw15 wclk no write 1 2 1 2 no write t wff t a t ens t ens (1) t ds t a d x t dh t clk t clkh ff rcs t rcss t rcslz t wff t skew1 t clkl d x+1 t wff t wff t ds t dh no operation rclk ren 4680 drw16 ef t clk t clkh t clkl t enh t ref t a t olz t oe q0 - qn oe wclk (1) t skew1 wen d0 - dn t ens t ens t enh t ds t dh d 0 1 2 t olz no operation last word d 0 d 1 d 1 t ens t enh t ds t dh t ohz last word t ref t enh t ens t a t a t ref t ens t enh figure 11. read cycle, output enable, empty flag and first data word latency timing (idt standard mode) notes: 1. t skew1 is the minimum time between a rising wclk edge and a rising rclk edge to guarantee that ef will go high (after one rclk cycle plus t ref ). if the time between the rising edge of wclk and the rising edge of rclk is less than t skew1 , then ef deassertion may be delayed one extra rclk cycle. 2. ld = high. 3. first data word latency = t skew1 + 1*t rclk + t ref. 4. rcs is low. notes: 1. t skew1 is the minimum time between a rising rclk edge and a rising wclk edge to guarantee that ff will go high (after one wclk cycle pus t wff ). if the time between the rising edge of the rclk and the rising edge of the wclk is less than t skew1 , then the ff deassertion may be delayed one extra wclk cycle. 2. ld = high, oe = low, ef = high figure 10. write cycle and full flag timing (idt standard mode)
29 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 rclk ren 1 2 4680 drw 17 rcs q0 - qn wclk wen dn t ens last data d x t rcsh t rcss t rcss t rcss ef t a t ref t ref t rcslz last data-1 t rcshz t rcslz t a t rcshz t skew1 (1) t enh t ens t dh t ds figure 12. read cycle and read chip select timing (idt standard mode) notes: 1. t skew1 is the minimum time between a rising wclk edge and a rising rclk edge to guarantee that ef will go high (after one rclk cycle plus t ref ). if the time between the rising edge of wclk and the rising edge of rclk is less than t skew1 , then ef deassertion may be delayed one extra rclk cycle. 2. ld = high. 3. first data word latency = t skew1 + 1*t rclk + t ref. 4. oe is low.
30 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 w 1 w 2 w 4 w [n +2] w [d-m-1] w [d-m-2] w [d-1] w d w [n+3] w [n+4] w [d-m] w [d-m+1] wclk wen d 0 - d n rclk t dh t ds t skew1 (1) ren q 0 - q n paf hf pae ir t ds t ds t ds t skew2 t a t ref or t paes t hf t pafs t wff w [d-m+2] w 1 t enh 4680 drw 18 previous data in output register (2) w 3 1 2 3 1 d-1 ] [ w d-1 ] [ w d-1 ] [ w 1 2 t ens rcs t rcss t rcslz figure 13. write timing (first word fall through mode) notes: 1. t skew1 is the minimum time between a rising wclk edge and a rising rclk edge to guarantee that or will go low after two rclk cycles plus t ref . if the time between the rising edge of wclk and the rising edge of rclk is less than t skew1 , then or assertion may be delayed one extra rclk cycle. 2. t skew2 is the minimum time between a rising wclk edge and a rising rclk edge to guarantee that pae will go high after one rclk cycle plus t paes . if the time between the rising edge of wclk and the rising edge of rclk is less than t skew2 , then the pae deassertion may be delayed one extra rclk cycle. 3. ld = high, oe = low 4. n = pae offset, m = paf offset and d = maximum fifo depth. 5. d = 513 for idt72v7230, 1,025 for idt72v7240, 2,049 for idt72v7250, 4,097 for idt72v7260, 8,193 for idt72v7270, 16,385 for the idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100. 6. first data word latency = t skew1 + 2*t rclk + t ref.
31 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 wclk 12 wen d 0 - d n rclk t ens ren q 0 - q n paf hf pae ir or w 1 w 1 w 2 w 3 w m+2 w [m+3] t ohz t skew1 t enh t ds t dh t oe t a t a t a t pafs t wff t wff t ens oe t skew2 w d 4680 drw 19 t paes w [d-n] w [d-n-1] t a t a t hf t ref w [d-1] w d t a w [d-n+1] w [m+4] w [d-n+2] (1) (2) t ens d-1 ] [ w d-1 ] [ w 1 figure 14. read timing (first word fall through mode) notes: 1. t skew1 is the minimum time between a rising rclk edge and a rising wclk edge to guarantee that ir will go low after one wclk cycle plus t wff . if the time between the rising edge of rclk and the rising edge of wclk is less than t skew1 , then the ir assertion may be delayed one extra wclk cycle. 2. t skew2 is the minimum time between a rising rclk edge and a rising wclk edge to guarantee that paf will go high after one wclk cycle plus t pafs . if the time between the rising edge of rclk and the rising edge of wclk is less than t skew2 , then the paf deassertion may be delayed one extra wclk cycle. 3. ld = high. 4. n = pae offset, m = paf offset and d = maximum fifo depth. 5. d = 513 for idt72v7230, 1,025 for idt72v7240, 2,049 for idt72v7250, 4,097 for idt72v7260, 8,193 for idt72v7270, 16,385 for th e idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100. 6. rcs = low.
32 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 wclk 12 wen d 0 - d n rclk ren q 0 - q n paf hf pae ir or w 1 w 2 w 3 w m+2 w [m+3] t rcshz t skew1 t enh t ds t dh t a t a t pafs t wff t wff t ens rcs t skew2 w d 4680 drw 20 t paes w [d-n] w [d-n-1] t a t a w [d-1] w d t a w [d-n+1] w [m+4] w [d-n+2] (1) (2) t ens 1 t rcss t rcslz t ens t hf t ref d-1 ] [ w d-1 ] [ w t rcsh figure 15. read cycle and read chip select timing (first word fall through mode) notes: 1. t skew1 is the minimum time between a rising rclk edge and a rising wclk edge to guarantee that ir will go low after one wclk cycle plus t wff . if the time between the rising edge of rclk and the rising edge of wclk is less than t skew1 , then the ir assertion may be delayed one extra wclk cycle. 2. t skew2 is the minimum time between a rising rclk edge and a rising wclk edge to guarantee that paf will go high after one wclk cycle plus t pafs . if the time between the rising edge of rclk and the rising edge of wclk is less than t skew2 , then the paf deassertion may be delayed one extra wclk cycle. 3. ld = high. 4. n = pae offset, m = paf offset and d = maximum fifo depth. 5. d = 513 for idt72v7230, 1,025 for idt72v7240, 2,049 for idt72v7250, 4,097 for idt72v7260, 8,193 for idt72v7270, 16,385 for th e idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100. 6. oe = low.
33 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 t ref t rts t enh 4680 drw21 t a t ens w x wclk rclk ren rt ef paf hf pae q 0 - q n t skew2 12 1 w 1 t pafs t hf t paes t ref w x+1 2 w 2 t enh wen t ens t rts t ens t enh (3) t a t a (3) notes: 1. retransmit setup is complete after ef returns high, only then can a read operation begin. 2. oe = low; rcs = low. 3. w 1 = first word written to the fifo after master reset, w 2 = second word written to the fifo after master reset. 4. no more than d - 2 may be written to the fifo between reset (master or partial) and retransmit setup. therefore, ff will be high throughout the retransmit setup procedure. d = 512 for idt72v7230, 1,024 for idt72v7240, 2,048 for idt72v7250, 4,096 for idt72v7260, 8,192 for idt72v7270, 16,384 for the idt72v7280, 32,768 for the idt72v7290 and 65,536 for the idt72v72100. 5. there must be at least two words written to the fifo before a retransmit operation can be invoked. 6. rm is set high during mrs. figure 16. retransmit timing (idt standard mode)
34 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 t ref 4680 drw22 t ens w x wclk rclk ren rt or paf hf pae q 0 - q n t skew2 12 1 t pafs t hf t paes w x+1 2 w 2 t enh t rts wen w 1 t ens (4) 3 4 t enh w 3 t a w 4 (4) (4) t a t a t a t rts t ens t enh t ref notes: 1. retransmit setup is complete after or returns low. 2. no more than d - 2 words may be written to the fifo between reset (master or partial) and retransmit setup. therefore, ir will be low throughout the retransmit setup procedure. d = 513 for the idt72v7230, 1,025 for the idt72v7240, 2,049 for the idt72v7250, 4,097 for the idt72v7260, 8,193 for the idt72v7 270, 16,385 for the idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100. 3. oe = low; rcs = low. 4. w 1 , w 2 , w 3 = first, second and third words written to the fifo after master reset. 5. there must be at least two words written to the fifo before a retransmit operation can be invoked. 6. rm is set high during mrs. figure 17. retransmit timing (fwft mode)
35 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 t rts t enh 4680 drw23 t a t ens w x wclk rclk ren rt ef paf hf pae q 0 - q n t skew2 12 1 w 2 (3) t pafs t hf t paes w x+1 2 w 3 wen t ens t enh t a t a 3 t a t a w 0 (3) w 1 (3) notes: 1. if the part is empty at the point of retransmit, the empty flag ( ef ) will be updated based on rclk (retransmit clock cycle), valid data will also appear on the output. 2. oe = low; rsc = low. 3. w 0 = first word written to the fifo after master reset, w 1 = second word written to the fifo after master reset. 4. no more than d - 2 may be written to the fifo between reset (master or partial) and retransmit setup. therefore, ff will be high throughout the retransmit setup procedure. d = 512 for idt72v7230, 1,024 for idt72v7240, 2,048 for idt72v7250, 4,096 for idt72v7260, 8,192 for idt72v7270, 16,384 for the idt72v7280, 32,768 for the idt72v7290 and 65,536 for the idt72v72100. 5. there must be at least two words written to the fifo before a retransmit operation can be invoked. 6. rm is set low during mrs. figure 18. zero latency retransmit timing (idt standard mode)
36 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 t rts t enh 4680 drw24 t ens w x wclk rclk ren rt or paf hf pae q 0 - q n t skew2 12 1 t pafs t hf t paes w x+1 2 w 3 wen t ens w 2 (4) 4 5 t enh w 4 t a t a t a w 5 t a (4) (4) 3 t a w1 sclk sen si 4680 drw25 t enh t ens t lds ld t ds bit 0 empty offset bit x bit 0 full offset (1) t enh bit x (1) t ldh t dh t ldh figure 20. serial loading of programmable flag registers (idt standard and fwft modes) note: 1. x = 9 for the idt72v7230, x= 10 for the idt72v7240, x = 11 for the idt72v7250, x = 12 for the idt72v7260, x = 13 for the idt7 2v7270, x = 14 for the idt72v7280, x = 15 for the idt72v7290 and x = 16 for the idt72v72100. notes: 1. if the part is empty at the point of retransmit, the output ready flag ( or ) will be updated based on rclk (retransmit clock cycle), valid data will also appear on the output. 2. no more than d - 2 words may be written to the fifo between reset (master or partial) and retransmit setup. therefore, ir will be low throughout the retransmit setup procedure. d = 513 for the idt72v7230, 1,025 for the idt72v7240, 2,049 for the idt72v7250, 4,097 for the idt72v7260, 8,193 for the idt72v7 270, 16,385 for the idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100. 3. oe = low; rcs = low. 4. w 1 , w 2 , w 3 = first, second and third words written to the fifo after master reset. 5. there must be at least two words written to the fifo before a retransmit operation can be invoked. 6. rm is set low during mrs. figure 19. zero latency retransmit timing (fwft mode)
37 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 wclk ld wen d 0 - d n 4680 drw26 t lds t ens pae offset paf offset t ds t dh t ldh t enh t clk t ldh t enh t dh t clkh t clkl rclk ld ren q 0 - q 16 t ldh t lds t ens data in output register pae offset paf offset t enh t enh t ldh 4680 drw27 t clk t a t a t clkh t clkl wclk wen paf rclk (3) t pafs ren 4680 drw 28 d - (m+1) words in fifo (2) d - m words in fifo (2) 1 2 12 d-(m+1) words in fifo (2) t pafs t enh t ens t skew2 t enh t ens t clkl t clkl notes: 1. m = paf offset. 2. d = maximum fifo depth. in idt standard mode: d = 512 for the idt72v7230, 1,024 for the idt72v7240, 2,048 for the idt72v7250, 4,096 for the idt72v7260 and 8,192 for the idt72v7270, 16,384 for the idt72v7280, 32,768 for the idt72v7290 and 65,536 for the idt72v72100. in fwft mode: d = 513 for the idt72v7230, 1,025 for the idt72v7240, 2,049 for the idt72v7250, 4,097 for the idt72v7260, 8,193 for the idt72v7270, 16,385 for the idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100. 3. t skew2 is the minimum time between a rising rclk edge and a rising wclk edge to guarantee that paf will go high (after one wclk cycle plus t pafs ). if the time between the rising edge of rclk and the rising edge of wclk is less than t skew2 , then the paf deassertion time may be delayed one extra wclk cycle. 4. paf is asserted and updated on the rising edge of wclk only. 5. select this mode by setting pfm high during master reset. figure 23. synchronous programmable almost-full flag timing (idt standard and fwft modes) notes: 1. oe = low; rcs = low. figure 22. parallel read of programmable flag registers (idt standard and fwft modes) figure 21. parallel loading of programmable flag registers (idt standard and fwft modes)
38 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 wclk t enh t clkh t clkl wen pae rclk t ens n words in fifo (2) , n+1 words in fifo (3) t paes t skew2 t paes 12 12 (4) ren 4680 drw29 t ens t enh n+1 words in fifo (2) , n+2 words in fifo (3) n words in fifo (2) , n+1 words in fifo (3) wclk t clkh t clkl t ens t enh wen paf t ens t pafa d - (m + 1) words in fifo rclk t pafa ren 4680 drw30 d - m words in fifo d - (m + 1) words in fifo notes: 1. n = pae offset. 2. for idt standard mode 3. for fwft mode. 4. t skew2 is the minimum time between a rising wclk edge and a rising rclk edge to guarantee that pae will go high (after one rclk cycle plus t paes ). if the time between the rising edge of wclk and the rising edge of rclk is less than t skew2 , then the pae deassertion may be delayed one extra rclk cycle. 5. pae is asserted and updated on the rising edge of wclk only. 6. select this mode by setting pfm high during master reset. 7. rcs is low. figure 24. synchronous programmable almost-empty flag timing (idt standard and fwft modes) notes: 1. m = paf offset. 2. d = maximum fifo depth. in idt standard mode: d = 512 for the idt72v7230, 1,024 for the idt72v7240, 2,048 for the idt72v7250, 4,096 for the idt72v7260, 8,192 for the idt72v7 270, 16,384 for the idt72v7280, 32,768 for the idt72v7290 and 65,536 for the idt72v72100. in fwft mode: d = 513 for the idt72v7230, 1,025 for the idt72v7240, 2,049 for the idt72v7250, 4,097 for the idt72v7260, 8,193 f or the idt72v7270, 16,385 for the idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100. 3. paf is asserted to low on wclk transition and reset to high on rclk transition. 4. select this mode by setting pfm low during master reset. figure 25. asynchronous programmable almost-full flag timing (idt standard and fwft modes)
39 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 wclk t clkh t clkl t ens t enh wen pae t ens t paea n + 1 words in fifo (2) , n + 2 words in fifo (3) n words in fifo (2) , n + 1 words in fifo (3) rclk t paea ren 4680 drw 31 n words in fifo (2) , n + 1 words in fifo (3) wclk t ens t enh wen hf t ens t hf rclk t hf ren 4680 drw32 t clkl t clkh d/2 words in fifo (1) , [ + 1 ] words in fifo (2) d-1 2 d/2 + 1 words in fifo (1) , [ + 2 ] words in fifo (2) d/2 words in fifo (1) , [ + 1 ] words in fifo (2) d-1 2 d-1 2 notes: 1. n = pae offset. 2. for idt standard mode. 3. for fwft mode. 4. pae is asserted low on rclk transition and reset to high on wclk transition. 5. select this mode by setting pfm low during master reset. notes: 1. in idt standard mode: d = maximum fifo depth. d = 512 for the idt72v7230, 1,024 for the idt72v7240, 2,048 for the idt72v7250, 4,096 for the idt72v7260, 8,192 for the idt72v7270, 16,384 for the idt72v7280, 32,768 for the idt72v7290 and 65,536 for the idt72v72100. 2. in fwft mode: d = maximum fifo depth. d = 513 for the idt72v7230, 1,025 for the idt72v7240, 2,049 for the idt72v7250, 4,097 for the idt72v7260, 8,193 for the idt72v7270, 16,385 for the idt72v7280, 32,769 for the idt72v7290 and 65,537 for the idt72v72100. figure 27. half-full flag timing (idt standard and fwft modes) figure 26. asynchronous programmable almost-empty flag timing (idt standard and fwft modes)
40 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 write clock (wclk) m + n m n master reset ( mrs ) read clock (rclk) data out n m + n write enable ( wen ) full flag/input ready ( ff / ir ) programmable ( paf ) programmable ( pae ) empty flag/output ready ( ef / or ) #2 output enable ( oe ) read enable ( ren ) m load ( ld ) empty flag/output ready ( ef / or ) #1 partial reset ( prs ) 4680 drw 33 full flag/input ready ( ff / ir ) #2 half-full flag ( hf ) first word fall through/ serial input (fwft/si) retransmit ( rt ) #1 fifo #2 gate (1) gate (1) d 0 - dm data in dm +1 - dn q 0 - q m qm +1 - qn fifo #1 idt 72v7230 72v7240 72v7250 72v7260 72v7270 72v7280 72v7290 72v72100 idt 72v7230 72v7240 72v7250 72v7260 72v7270 72v7280 72v7290 72v72100 read ship select ( rcs ) notes: 1. use an and gate in idt standard mode, an or gate in fwft mode. 2. do not connect any output control signals directly together. 3. fifo #1 and fifo #2 must be the same depth, but may be different word widths. optional configurations width expansion configuration word width may be increased simply by connecting together the control signals of multiple devices. status flags can be detected from any one device. the exceptions are the ef and ff functions in idt standard mode and the ir and or functions in fwft mode. because of variations in skew between rclk and wclk, it is possible for ef / ff deassertion and ir / or assertion to vary by one cycle between fifos. in idt standard mode, such problems can be figure 28. block diagram of 512 x 144, 1,024 x 144, 2,048 x 144, 4,096 x 144, 8,192 x 144, 16,384 x 144, 32,768 x 144 and 65,5 36 x 144 width expansion avoided by creating composite flags, that is, anding ef of every fifo, and separately anding ff of every fifo. in fwft mode, composite flags can be created by oring or of every fifo, and separately oring ir of every fifo. figure 28 demonstrates a width expansion using two idt72v7230/ 72v7240/72v7250/72v7260/72v7270/72v7280/72v7290/72v72100 de- vices. d 0 - d 71 from each device form a 144-bit wide input bus and q 0 -q 71 from each device form a 144-bit wide output bus. any word width can be attained by adding additional idt72v7230/72v7240/72v7250/72v7260/72v7270/ 72v7280/72v7290/72v72100 devices.
41 commercial temperature range idt72v7230/7240/7250/7260/7270/7280/7290/72100 3.3v high density supersync ii tm fifo 512 x 72, 1k x 72, 2k x 72, 4k x 72, 8k x 36, 16k x 72, 32k x 72, 64k x 72 dn input ready write enable write clock wen wclk ir data in rclk read clock rclk ren oe output enable output ready qn dn ir gnd wen wclk or ren oe qn read enable or data out transfer clock 4680 drw34 n n n fwft/si fwft/si fwft/si idt 72v7230 72v7240 72v7250 72v7260 72v7270 72v7280 72v7290 72v72100 idt 72v7230 72v7240 72v7250 72v7260 72v7270 72v7280 72v7290 72v72100 read cip select rcs rcs figure 29. block diagram of 1,024 x 72, 2,048 x 72, 4,096 x 72, 8,192 x 72, 16,384 x 72, 32,768 x 72, 65,572 x 72 and 131,072 x 72 depth expansion depth expansion configuration (fwft mode only) the idt72v7230 can easily be adapted to applications requiring depths greater than 512, 1,024 for the idt72v7240, , 2,048 for the idt72v7250, 4,096 for the idt72v7260, 8,192 for the idt72v7270, 16,384 for the idt72v7280, 32,768 for the idt72v7290 and 65,536 for the idt72v72100 with an 72-bit bus width. in fwft mode, the fifos can be connected in series (the data outputs of one fifo connected to the data inputs of the next) with no external logic necessary. the resulting configuration provides a total depth equivalent to the sum of the depths associated with each single fifo. figure 29 shows a depth expansion using two idt72v7230/72v7240/72v7250/ 72v7260/72v7270/72v7280/72v7290/72v72100 devices. care should be taken to select fwft mode during master reset for all fifos in the depth expansion configuration. the first word written to an empty configuration will pass from one fifo to the next ("ripple down") until it finally appears at the outputs of the last fifo in the chain ? no read operation is necessary but the rclk of each fifo must be free-running. each time the data word appears at the outputs of one fifo, that device's or line goes low, enabling a write to the next fifo in line. for an empty expansion configuration, the amount of time it takes for or of the last fifo in the chain to go low (i.e. valid data to appear on the last fifo's outputs) after a word has been written to the first fifo is the sum of the delays for each individual fifo: (n ? 1)*(4*transfer clock) + 3*t rclk where n is the number of fifos in the expansion and t rclk is the rclk period. note that extra cycles should be added for the possibility that the t skew1 specification is not met between wclk and transfer clock, or rclk and transfer clock, for the or flag. the "ripple down" delay is only noticeable for the first word written to an empty depth expansion configuration. there will be no delay evident for subsequent words written to the configuration. the first free location created by reading from a full depth expansion configuration will "bubble up" from the last fifo to the previous one until it finally moves into the first fifo of the chain. each time a free location is created in one fifo of the chain, that fifo's ir line goes low, enabling the preceding fifo to write a word to fill it. for a full expansion configuration, the amount of time it takes for ir of the first fifo in the chain to go low after a word has been read from the last fifo is the sum of the delays for each individual fifo: (n ? 1)*(3*transfer clock) + 2 t wclk where n is the number of fifos in the expansion and t wclk is the wclk period. note that extra cycles should be added for the possibility that the t skew1 specification is not met between rclk and transfer clock, or wclk and transfer clock, for the ir flag. the transfer clock line should be tied to either wclk or rclk, whichever is faster. both these actions result in data moving, as quickly as possible, to the end of the chain and free locations to the beginning of the chain.
42 corporate headquarters for sales: for tech support: 2975 stender way 800-345-7015 or 408-727-6116 408-330-1753 santa clara, ca 95054 fax: 408-492-8674 email: fif ohelp@idt.com www.idt.com ordering information fine pitch ball grid array (pbga, bb256 ? 1) commercial (0 c to +70 c) low power 512 x 72 ? 3.3v supersync ii fifo 1,024 x 72 ? 3.3v supersync ii fifo 2,048 x 72 ? 3.3v supersync ii fifo 4,096 x 72 ? 3.3v supersync ii fifo 8,192 x 72 ? 3.3v supersync ii fifo 16,384 x 72 ? 3.3v supersync ii fifo 32,768 x 72 ? 3.3v supersync ii fifo 65,536 x 72 ? 3.3v supersync ii fifo 4680 drw35 clock cycle time (t clk ) speed in nanoseconds commercial idt xxxxx device type x power xx speed x package x process / temperature range blank 72v7230 72v7240 72v7250 72v7260 72v7270 72v7280 72v7290 72v72100 l 10 15 bb note: 1. industrial temperature range is available by special order. datasheet document history 06/01/2000 pgs. 1, 2, 3, 7, 33, 34, 34, 35, 38, 41, and 42. 11/01/2000 pgs. 1, 2, and 42. 01/10/2001 pg. 7. 04/12/2001 pgs. 3, 4, 5, 17, 26, and 27. 05/01/2001 pg. 23. 10/04/2001 pg. 36. 12/16/2002 pgs. 1, 4, 6, 22, 24, and 41. 02/11/2003 pgs. 6, and 24. 09/29/2003 pg. 7. 12/17/2003 pg. 35.

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