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9-mbit qdr- ii? sram 2-word burst architecture cy7c1292dv18 cy7c1294dv18 cypress semiconductor corporation ? 198 champion court ? san jose , ca 95134-1709 ? 408-943-2600 document #: 001-00350 rev. *a revised july 20, 2006 features ? separate independent read and write data ports ? supports concurrent transactions ? 250-mhz clock for high bandwidth ? 2-word burst on all accesses ? double data rate (ddr) in terfaces on both read and write ports (data transferred at 500 mhz) @ 250 mhz ? two input clocks (k and k ) for precise ddr timing ? sram uses rising edges only ? two input clocks for output data (c and c ) to minimize clock-skew an d flight-time mismatches ? echo clocks (cq and cq ) simplify data capture in high-speed systems ? single multiplexed address input bus latches address inputs for both read and write ports ? separate port selects for depth expansion ? synchronous internally self-timed writes ? available in x 18 and x 36 configurations ? full data coherency, providing most current data ?core v dd = 1.8v (0.1v); i/o v ddq = 1.4v to v dd ? available in 165-ball fbga package (13 x 15 x 1.4 mm) ? offered in both lead-free and non-lead free packages ? variable drive hstl output buffers ? jtag 1149.1 compatible test access port ? delay lock loop (dll) for accurate data placement configurations cy7c1292dv18 ? 512k x 18 cy7c1294dv18 ? 256k x 36 functional description the cy7c1292dv18 and cy7c1294dv18 are 1.8v synchronous pipelined srams, equipped with qdr?-ii architecture. qdr-ii architecture consists of two separate ports to access the memory array. the read port has dedicated data outputs to support read operations and the write port has dedicated data inputs to support write opera- tions. qdr-ii architecture has separate data inputs and data outputs to completely eliminate the need to ?turn-around? the data bus required with common i/o devices. access to each port is accomplished through a common address bus. the read address is latched on the rising edge of the k clock and the write address is latched on the rising edge of the k clock. accesses to the qdr-ii read and write ports are completely independent of one another. in order to maximize data throughput, both read and write ports are equipped with double data rate (ddr) interfaces. each address location is associated with two 18-bit words (cy7c1292dv18) or 36-bit words (cy7c1294dv18) that burst sequentially into or out of the device. since data can be transferred into and out of the device on every rising edge of both input clocks (k and k and c and c ), memory bandwidth is maximized while simplifying system design by elimin ating bus ?turn-arounds.? depth expansion is accomplished with port selects for each port. port selects allow each port to operate independently. all synchronous inputs pass through input registers controlled by the k or k input clocks. all data outputs pass through output registers controlled by the c or c (or k or k in a single clock domain) input clocks. writes are conducted with on-chip synchronous self-timed write circuitry. selection guide 250 mhz 200 mhz 167 mhz unit maximum operating frequency 250 200 167 mhz maximum operating current 600 550 500 ma [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 2 of 23 logic block diagram (cy7c1292dv18) clk a (17:0) gen. k k control logic address register d [17:0] read add. decode read data reg. rps wps q [17:0] control logic address register reg. reg. reg. 18 18 18 36 18 bws [1:0] v ref write add. decode 18 a (17:0) 18 c c 18 256k x 18 array 256k x 18 array write reg write reg cq cq 18 doff logic block diagram (cy7c1294dv18) clk a (16:0) gen. k k control logic address register d [35:0] read add. decode read data reg. rps wps q [35:0] control logic address register reg. reg. reg. 36 17 36 72 36 bws [3:0] v ref write add. decode 36 a (16:0) 17 c c 36 128k x 36 array 128k x 36 array write reg write reg cq cq 36 doff [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 3 of 23 pin configurations cy7c1292dv18 (512k x 18) 234 56 7 1 a b c d e f g h j k l m n p r a cq nc nc nc nc doff nc nc/144m nc/36m bws 1 k wps nc/288m q9 d9 nc nc nc tdo nc nc d13 nc nc nc tck nc d10 a nc k bws 0 v ss aaa q10 v ss v ss v ss v ss v dd a v ss v ss v ss v dd q11 d12 v ddq d14 q14 d16 q16 q17 a v ddq v ss v ddq v dd v dd q13 v ddq v dd v ddq v dd v ddq v dd v ss v dd v ddq v ddq v ss v ss v ss v ss a a c v ss a a a d11 v ss nc v ss q12 nc v ref v ss v dd v ss v ss a v ss c nc q15 nc d17 d15 v dd a 891011 q0 nc/18m nc/72m rps cq a nc nc q8 v ss nc q7 d8 nc v ss nc q6 d5 nc nc v ref nc q3 v ddq nc v ddq nc q5 v ddq v ddq v ddq d4 v ddq nc q4 nc v ddq v ddq nc v ss nc d2 nc tdi tms v ss a nc a d7 d6 nc zq d3 q2 d1 q1 d0 nc a 165-ball fbga (13 x 15 x 1.4 mm) pinout 23 4 567 1 a b c d e f g h j k l m n p r a cq q27 d27 d28 d34 doff q33 nc/288m nc/72m bws 2 k wps bws 1 q18 d18 q30 d31 d33 tdo q28 d29 d22 d32 q34 q31 tck d35 d19 a bws 3 k bws 0 v ss a nc/18m a q19 v ss v ss v ss v ss v dd a v ss v ss v ss v dd q20 d21 v ddq d23 q23 d25 q25 q26 a v ddq v ss v ddq v dd v dd q22 v ddq v dd v ddq v dd v ddq v dd v ss v dd v ddq v ddq v ss v ss v ss v ss a a c v ss a a a d20 v ss q29 v ss q21 d30 v ref v ss v dd v ss v ss a v ss c q32 q24 q35 d26 d24 v dd a 891011 q0 nc/36m nc/144m rps cq a d17 q17 q8 v ss d16 q7 d8 q16 v ss d15 q6 d5 d9 q14 v ref q11 q3 v ddq q15 v ddq d14 q5 v ddq vddq v ddq d4 v ddq d12 q4 q12 v ddq v ddq d11 v ss d10 d2 q10 tdi tms v ss a q9 a d7 d6 d13 zq d3 q2 d1 q1 d0 q13 a cy7c1294dv18 (256k x 36) [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 4 of 23 pin definitions pin name i/o pin description d [x:0] input- synchronous data input signals, sampled on the rising edge of k and k clocks during valid write operations . cy7c1292dv18 - d [17:0] cy7c1294dv18 - d [35:0] wps input- synchronous write port select, active low . sampled on the rising edge of the k clock. when asserted active, a write operation is initiated. deassert ing will deselect the write port. deselecting the write port will cause d [x:0] to be ignored. bws 0 , bws 1 , bws 2 , bws 3 input- synchronous byte write select 0, 1, 2 and 3 ? active low . sampled on the rising edge of the k and k clocks during write operations. used to select which byte is written into the device during the current portion of the write operations. bytes not written remain unaltered. cy7c1292dv18 ? bws 0 controls d [8:0] , bws 1 controls d [17:9] . cy7c1294dv18 ? bws 0 controls d [8:0] , bws 1 controls d [17:9] ,bws 2 controls d [26:18] and bws 3 controls d [35:27]. all the byte write selects are sampled on the sa me edge as the data. deselecting a byte write select will cause the corresponding byte of data to be ignored and not written into the device. a input- synchronous address inputs. sampled on the rising edge of the k (read address) and k (write address) clocks during active read and write operations . these address inputs are multiplexed for both read and write operations. internally, the device is organized as 512k x 18 (2 arrays each of 256k x 18) for cy7c1292dv18 and 256k x 36 (2 arrays each of 128k x 36) for cy7c1294dv18. therefore 18 address inputs for cy7c1292dv18 and 17 address inputs for cy7c1294dv18. these inputs are ignored when the appropriate port is deselected. q [x:0] outputs- synchronous data output signals . these pins drive out the requested data during a read operation. valid data is driven out on the rising edge of both the c and c clocks during read operations or k and k when in single clock mode. when the read port is deselected, q [x:0] are automatically tri-stated. cy7c1292dv18 ? q [17:0] cy7c1294dv18 ? q [35:0] rps input- synchronous read port select, active low . sampled on the rising edge of positive input clock (k). when active, a read operation is initiated. deassert ing will cause the read port to be deselected. when deselected, the pending access is allo wed to complete and the output drivers are automatically tri-stated following the next rising edge of the c clock. each read access consists of a burst of two sequential transfers. c input-clock positive input clock for output data . c is used in conjunction with c to clock out the read data from the device. c and c can be used together to deskew t he flight times of various devices on the board back to the controller. see application example for further details. c input-clock negative input cloc k for output data . c is used in conjunction with c to clock out the read data from the device. c and c can be used together to deskew the flight times of various devices on the board back to the controller. see application example for further details. k input-clock positive input clock input . the rising edge of k is used to capture synchronous inputs to the device and to drive out data through q [x:0] when in single clock mode. all accesses are initiated on the rising edge of k. k input-clock negative input clock input . the rising edge of k is used to capture synchronous inputs being presented to the device and to drive out data through q [x:0] when in single clock mode. cq echo clock cq is referenced with respect to c . this is a free running clock and is synchronized to the input clock for output data (c) of the qdr-ii. in the single clock mode, cq is generated with respect to k. the timings for the echo clocks are shown in the ac timing table. cq echo clock cq is referenced wi th respect to c . this is a free running clock and is synchronized to the input clock for output data (c ) of the qdr-ii. in the single clock mode, cq is generated with respect to k . the timings for the echo clocks are shown in the ac timing table. zq input output impedance matching input . this input is used to tune the device outputs to the system data bus impedance. cq, cq , and q [x:0] output impedance are set to 0.2 x rq, where rq is a resistor connected between zq a nd ground. alternately, this pi n can be connected directly to v ddq , which enables the minimum impedance mode. this pin cannot be connected directly to gnd or left unconnected. [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 5 of 23 functional overview the cy7c1292dv18 and cy7c1294dv18 are synchronous pipelined burst srams equipped with both a read port and a write port. the read port is dedicated to read operations and the write port is dedicated to write operations. data flows into the sram through the write port and out through the read port. these devices multiplex the address inputs in order to minimize the number of address pins required. by having separate read and write ports, the qdr-ii completely elimi- nates the need to ?turn-around? the data bus and avoids any possible data contention, ther eby simplifying system design. each access consists of two 18-bit data transfers in the case of cy7c1292dv18 and two 36-bit data transfers in the case of cy7c1294dv18 in one clock cycle. accesses for both ports are initiated on the rising edge of the positive input clock (k). all synchronous input timings are referenced from the rising edge of the input clocks (k and k ) and all output timings are referenced to the rising edge of output clocks (c and c or k and k when in single clock mode). all synchronous data inputs (d [x:0] ) inputs pass through input registers controlled by th e input clocks (k and k ). all synchronous data outputs (q [x:0] ) outputs pass through output registers controlled by the ri sing edge of the output clocks (c and c or k and k when in single clock mode). all synchronous control (rps , wps , bws [x:0] ) inputs pass through input registers controlled by the rising edge of the input clocks (k and k ). cy7c1292dv18 is described in the following sections. the same basic descriptions apply to cy7c1294dv18. read operations the cy7c1292dv18 is organized internally as 2 arrays of 256k x 18. accesses are completed in a burst of two sequential 18-bit data words. read operations are initiated by asserting rps active at the rising edge of the positive input clock (k). the address is latched on the rising edge of the k clock. the address presented to address inputs is stored in the read address register. following the next k clock rise the corresponding lowest order 18-bit word of data is driven onto the q [17:0] using c as the output timing reference. on the subsequent rising edge of c, the next 18-bit data word is driven onto the q [17:0] . the requested data will be valid 0.45 ns from the rising edge of the output clock (c and c or k and k when in single clock mode). synchronous internal circuitry w ill automatically tri-state the outputs following the next rising edge of the output clocks (c/c ). this will allow for a seamless transition between devices without the insertion of wait states in a depth expanded memory. write operations write operations are initiated by asserting wps active at the rising edge of the positive input clock (k). on the same k clock rise, the data presented to d [17:0] is latched and stored into the lower 18-bit write data register provided bws [1:0] are both asserted active. on the subsequent rising edge of the negative input clock (k ), the address is latched and the infor- mation presented to d [17:0] is stored into the write data register provided bws [1:0] are both asserted active. the 36 bits of data are then written into the memory array at the specified location. when deselected, the write port will ignore all inputs after the pending write operations have been completed. doff input dll turn off, active low . connecting this pin to ground will turn off the dll inside the device. the timings in the dll turned off operation will be different from those listed in this data sheet. tdo output tdo for jtag . tck input tck pin for jtag . tdi input tdi pin for jtag . tms input tms pin for jtag . nc n/a not connected to the die . can be tied to any voltage level. nc/18m n/a not connected to the die . can be tied to any voltage level. nc/36m n/a not connected to the die . can be tied to any voltage level. nc/72m n/a not connected to the die . can be tied to any voltage level. nc/144m n/a not connected to the die . can be tied to any voltage level. nc/288m n/a not connected to the die . can be tied to any voltage level. v ref input- reference reference voltage input . static input used to set the reference level for hstl inputs and outputs as well as ac measurement points. v dd power supply power supply inputs to the core of the device . v ss ground ground for the device . v ddq power supply power supply inputs for the outputs of the device . pin definitions (continued) pin name i/o pin description [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 6 of 23 byte write operations byte write operations are supported by the cy7c1292dv18. a write operation is initiated as described in the write opera- tions section above. the bytes that are written are determined by bws 0 and bws 1 , which are sampled with each 18-bit data word. asserting the appropriate byte write select input during the data portion of a write will allow the data being presented to be latched and written into t he device. deasserting the byte write select input during the dat a portion of a write will allow the data stored in the device for that byte to remain unaltered. this feature can be used to simplify read/modify/write opera- tions to a byte write operation. single clock mode the cy7c1292dv18 can be used with a single clock that controls both the input and output registers. in this mode, the device will recognize only a singl e pair of input clocks (k and k ) that control both the input and output registers. this operation is identical to the operation if the device had zero skew between the k/k and c/c clocks. all timing parameters remain the same in this mode. to use this mode of operation, the user must tie c and c high at power on. this function is a strap option and not alterable during device operation. concurrent transactions the read and write ports on the cy7c1292dv18 operate completely independently of one another. since each port latches the address inputs on different clock edges, the user can read or write to any location, regardless of the trans- action on the other port. also, reads and writes can be started in the same clock cycle. if the ports access the same location at the same time, the sram will deliver the most recent infor- mation associated with the s pecified address location. this includes forwarding data from a write cycle that was initiated on the previous k clock rise. depth expansion the cy7c1292dv18 has a port select input for each port. this allows for easy depth expansion. both port selects are sampled on the rising edge of the positive input clock only (k). each port select input can deselect the specified port. deselecting a port will not affect the other port. all pending transactions (read and write) will be completed prior to the device being deselected. programmable impedance an external resistor, rq, must be connected between the zq pin on the sram and v ss to allow the sram to adjust its output driver impedance. the va lue of rq must be 5x the value of the intended line impedance driven by the sram. the allowable range of rq to guarantee impedance matching with a tolerance of 15% is between 175 ? and 350 ? , with v ddq = 1.5v.the output impedance is adjusted every 1024 cycles upon power-up to account for drifts in supply voltage and temperature. echo clocks echo clocks are provided on the qdr-ii to simplify data capture on high-speed system s. two echo clocks are generated by the qdr-ii. cq is referenced with respect to c and cq is referenced with respect to c . these are free-running clocks and are syn chronized to t he output clock (c/c ) of the qdr-ii. in the singl e clock mode, cq is generated with respect to k and cq is generated with respect to k . the timings for the echo clocks are shown in the ac timing table. dll these chips utilize a delay lock loop (dll) that is designed to function between 80 mhz and the specified maximum clock frequency. during power-up, when the doff is tied high, the dll gets locked after 1024 cycles of stable clock. the dll can also be reset by slowing or stopping the input clock k and k for a minimum of 30 ns. however, it is not necessary for the dll to be specifically reset in order to lock the dll to the desired frequency. the dll will automatically lock 1024 clock cycles after a stable clock is presented.the dll may be disabled by applying ground to the doff pin. for information refer to the application no te ?dll considerations in qdrii/ddrii/qdrii+/ddrii+?. [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 7 of 23 application example [1] truth table [2, 3, 4, 5, 6, 7] operation k rps wps dq dq write cycle: load address on the rising edge of k clock; input write data on k and k rising edges. l-h x l d(a + 0) at k(t) d(a + 1) at k (t) read cycle: load address on the rising edge of k clock; wait one and a half cycle; read data on c and c rising edges. l-h l x q(a + 0) at c (t + 1) q(a + 1) at c(t + 2) nop: no operation l-h h h d = x, q = high-z d = x, q = high-z standby: clock stopped stopped x x previous state previous state write cycle descriptions (cy7c1292dv18) [2, 8] bws 0 bws 1 kk comments l l l-h ? during the data portion of a write sequence : both bytes (d [17:0] ) are written into the device. l l ? l-h during the data portion of a write sequence : both bytes (d [17:0] ) are written into the device. l h l-h ? during the data porti on of a write sequence : only the lower byte (d [8:0] ) is written into the device. d [17:9] will remain unaltered. l h ? l-h during the data portion of a write sequence : only the lower byte (d [8:0] ) is written into the device. d [17:9] will remain unaltered. h l l-h ? during the data portion of a write sequence : only the upper byte (d [17:9] ) is written into the device. d [8:0] will remain unaltered. h l ? l-h during the data portion of a write sequence : only the upper byte (d [17:9] ) is written into the device. d [8:0] will remain unaltered. h h l-h ? no data is written into the devices during this portion of a write operation. h h ? l-h no data is written into the devices during this portion of a write operation. notes: 1. the above application shows four qdr-ii being used. 2. x = ?don't care,? h = logic high, l= logic low, represents rising edge. 3. device will power-up deselected and the outputs in a tri-state condition. 4. ?a? represents address location latched by the devices when transaction was initiated. a + 0, a + 1 represents the internal a ddress sequence in the burst. 5. ?t? represents the cycle at which a read/write operation is started. t + 1 and t + 2 are the first and second clock cycles re spectively succeeding the ?t? clock cycle. 6. data inputs are registered at k and k rising edges. data outputs are delivered on c and c rising edges, except when in single clock mode. 7. it is recommended that k = k and c = c = high when clock is stopped. this is not essential, but permits most rapid restart by overcoming transmission line charging symmetrically. 8. assumes a write cycle was initiated per the write port cycle description truth table. nws 0 , nws 1 , bws 0 , bws 1 , bws 2 and bws 3 can be altered on different portions of a write cycle, as long as the set-up and hold requirements are achieved. vt = vddq/2 cc# d a k cc# d a k bus master (cpu or asic) sram #1 sram #4 data in data out address rps# wps# bws# source k source k# delayed k delayed k# r = 50 ??? r = 250 ??? r = 250 ??? r p s # w p s # b w s # r p s # w p s # b w s # vt vt vt r r r zq cq/cq# q k# zq cq/cq# q k# clkin/clkin# [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 8 of 23 write cycle descriptions (cy7c1294dv18) [2, 8] bws 0 bws 1 bws 2 bws 3 kk comments l l l l l-h - during the data portion of a write sequence, all four bytes (d [35:0] ) are written into the device. l l l l - l-h during the data portion of a write sequence, all four bytes (d [35:0] ) are written into the device. l h h h l-h - during the data portion of a write sequence, only the lower byte (d [8:0] ) is written into the device. d [35:9] will remain unaltered. l h h h - l-h during the data portion of a write sequence, only the lower byte (d [8:0] ) is written into the device. d [35:9] will remain unaltered. h l h h l-h - during the data portion of a write sequence, only the byte (d [17:9] ) is written into the device. d [8:0] and d [35:18] will remain unaltered. h l h h - l-h during the data portion of a write sequence, only the byte (d [17:9] ) is written into the device. d [8:0] and d [35:18] will remain unaltered. h h l h l-h - during the data portion of a write sequence, only the byte (d [26:18] ) is written into the device. d [17:0] and d [35:27] will remain unaltered. h h l h - l-h during the data portion of a write sequence, only the byte (d [26:18] ) is written into the device. d [17:0] and d [35:27] will remain unaltered. h h h l l-h during the data portion of a write sequence, only the byte (d [35:27] ) is written into the device. d [26:0] will remain unaltered. h h h l - l-h during the data portion of a write sequence, only the byte (d [35:27] ) is written into the device. d [26:0] will remain unaltered. h h h h l-h - no data is written into the device during this portion of a write operation. h h h h - l-h no data is written into the device during this portion of a write operation. [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 9 of 23 ieee 1149.1 serial boundary scan (jtag) these srams incorporate a serial boundary scan test access port (tap) in the fbga package. this part is fully compliant with ieee standard #1149.1-1900. the tap operates using jedec standard 1.8v i/o logic levels. disabling the jtag feature it is possible to operate the sram without using the jtag feature. to disable the tap controller, tck must be tied low (v ss ) to prevent clocking of the device. tdi and tms are inter- nally pulled up and may be unconnected. they may alternately be connected to v dd through a pull-up resistor. tdo should be left unconnected. upon power-up, the device will come up in a reset state which will not interfere with the operation of the device. test access port?test clock the test clock is used only with the tap controller. all inputs are captured on the rising edge of tck. all outputs are driven from the falling edge of tck. test mode select the tms input is used to give commands to the tap controller and is sampled on the rising edge of tck. it is allowable to leave this pin unconnected if the tap is not used. the pin is pulled up internally, resulting in a logic high level. test data-in (tdi) the tdi pin is used to serially input information into the registers and can be connected to the input of any of the registers. the register between tdi and tdo is chosen by the instruction that is loaded into the tap instruction register. for information on loading the instruction register, see the tap controller state diagram. tdi is internally pulled up and can be unconnected if the tap is unused in an application. tdi is connected to the most signific ant bit (msb) on any register. test data-out (tdo) the tdo output pin is used to serially clock data-out from the registers. the output is ac tive depending upon the current state of the tap state machine (see instruction codes). the output changes on the falling edge of tck. tdo is connected to the least significant bit (lsb) of any register. performing a tap reset a reset is performed by forcing tms high (vdd) for five rising edges of tck. this rese t does not affect the operation of the sram and may be performed while the sram is operating. at power-up, the tap is reset internally to ensure that tdo comes up in a high-z state. tap registers registers are connected betw een the tdi and tdo pins and allow data to be scanned into and out of the sram test circuitry. only one register can be selected at a time through the instruction register s. data is serially loaded into the tdi pin on the rising edge of tck. data is output on the tdo pin on the falling edge of tck. instruction register three-bit instructions can be seri ally loaded into the instruction register. this register is loaded when it is placed between the tdi and tdo pins as shown in tap controller block diagram. upon power-up, the instruction register is loaded with the idcode instruction. it is also loaded with the idcode instruction if the controller is placed in a reset state as described in the previous section. when the tap controller is in the capture ir state, the two least significant bits are loaded with a binary ?01? pattern to allow for fault isolation of the board level serial test path. bypass register to save time when serially shifting data through registers, it is sometimes advantageous to skip certain chips. the bypass register is a single-bit register that can be placed between tdi and tdo pins. this allows data to be shifted through the sram with minimal delay. the bypass register is set low (v ss ) when the bypass instruction is executed. boundary scan register the boundary scan register is connected to all of the input and output pins on the sram. seve ral no connect (nc) pins are also included in the scan register to reserve pins for higher density devices. the boundary scan register is loaded with the contents of the ram input and output ring when the tap controller is in the capture-dr state and is then placed between the tdi and tdo pins when the controller is moved to the shift-dr state. the extest, sample/preload and sample z instruc- tions can be used to capture the contents of the input and output ring. the boundary scan order tables show the order in which the bits are connected. each bit corresponds to one of the bumps on the sram package. the msb of the register is connected to tdi, and the lsb is connected to tdo. identification (id) register the id register is loaded with a vendor-specific, 32-bit code during the capture-dr state when the idcode command is loaded in the instruction register. the idcode is hardwired into the sram and can be shifted out when the tap controller is in the shift-dr state. the id register has a vendor code and other information described in the identification register definitions table. tap instruction set eight different instructions are possible with the three-bit instruction register. all combinations are listed in the instruction code table. three of these instructions are listed as reserved and should not be used. the other five instruc- tions are described in detail below. instructions are loaded into the tap controller during the shift-ir state when the instruction register is placed between tdi and tdo. during this stat e, instructions are shifted through the instruction register through the tdi and tdo pins. to execute the instruction once it is shifted in, the tap controller needs to be moved into the update-ir state. [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 10 of 23 idcode the idcode instruction causes a vendor-specific, 32-bit code to be loaded into the instruction register. it also places the instruction register between the tdi and tdo pins and allows the idcode to be shifted out of the device when the tap controller enters the shift-dr st ate. the idcode instruction is loaded into the instruction register upon power-up or whenever the tap controller is given a test logic reset state. sample z the sample z instruction caus es the boundary scan register to be connected between the tdi and tdo pins when the tap controller is in a shift-dr state. the sample z command puts the output bus into a high-z state until the next command is given during the ?update ir? state. sample/preload sample/preload is a 1149.1 mandatory instruction. when the sample/preload instructi ons are loaded into the instruction register and the tap controller is in the capture-dr state, a snapshot of data on the inputs and output pins is captured in the boundary scan register. the user must be aware that th e tap controller clock can only operate at a frequency up to 20 mhz, while the sram clock operates more than an order of magnitude faster. because there is a large difference in the clock frequencies, it is possible that during the captur e-dr state, an input or output will undergo a transition. the tap may then try to capture a signal while in transition (metastable state). this will not harm the device, but there is no guar antee as to the value that will be captured. repeatable results may not be possible. to guarantee that the boundary scan register will capture the correct value of a signal, the sram signal must be stabilized long enough to meet the tap controller's capture set-up plus hold times (t cs and t ch ). the sram clock input might not be captured correctly if there is no way in a design to stop (or slow) the clock during a sampl e/preload instruction. if this is an issue, it is still possible to capture all other signals and simply ignore the value of the ck and ck captured in the boundary scan register. once the data is captured, it is possible to shift out the data by putting the tap into the shift-dr state. this places the boundary scan register between the tdi and tdo pins. preload allows an initial data pattern to be placed at the latched parallel outputs of the boundary scan register cells prior to the selection of another boundary scan test operation. the shifting of data for the sample and preload phases can occur concurrently when required?that is, while data captured is shifted out, the pr eloaded data can be shifted in. bypass when the bypass instruction is loaded in t he instruction register and the tap is placed in a shift-dr state, the bypass register is placed between the tdi and tdo pins. the advantage of the bypass instructio n is that it shortens the boundary scan path when multiple devices are connected together on a board. extest the extest instruction enables the preloaded data to be driven out through the system out put pins. this instruction also selects the boundary scan register to be connected for serial access between the tdi and tdo in the shift-dr controller state. extest output bus tri-state ieee standard 1149.1 mandates that t he tap controller be able to put the output bus into a tri-state mode. the boundary scan register has a special bit located at bit #47. when this scan cell, called the ?extest output bus tri-state,? is latched into the preload register during the ?update-dr? state in the tap controller, it will directly control the state of the output (q-bus) pins, when the extest is entered as the current instruction. when high, it will enable the output buffers to drive the output bus. when low, this bit will place the output bus into a high-z condition. this bit can be set by entering the sample/preload or extest command, and then shifting the desired bit into that cell, during the ?shift-dr? stat e. during ?update-dr?, the value loaded into that shift-register cell will latch into the preload register. when the extest instru ction is entered, this bit will directly control the output q-bu s pins. note that this bit is pre-set low to enable the output when the device is powered-up, and also when the tap controller is in the ?test-logic-reset? state. reserved these instructions are not im plemented but are reserved for future use. do not use these instructions. [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 11 of 23 note: 9. the 0/1 next to each state represents the value at tms at the rising edge of tck. tap controller state diagram [9] test-logic reset test-logic/ idle select dr-scan capture-dr shift-dr exit1-dr pause-dr exit2-dr update-dr select ir-scan capture-ir shift-ir exit1-ir pause-ir exit2-ir update-ir 1 0 1 1 0 1 0 1 0 0 0 1 1 1 0 1 0 1 0 0 0 1 0 1 1 0 1 0 0 1 1 0 [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 12 of 23 tap controller block diagram 0 0 1 2 . . 29 30 31 boundary scan register identification register 0 1 2 . . . . 106 0 1 2 instruction register bypass register selection circuitry selection circuitry tap controller tdi tdo tck tms tap electrical characteristics over the operating range [10, 11, 12] parameter description test conditions min. max. unit v oh1 output high voltage i oh = ? 2.0 ma 1.4 v v oh2 output high voltage i oh = ? 100 a1.6 v v ol1 output low voltage i ol = 2.0 ma 0.4 v v ol2 output low voltage i ol = 100 a0.2v v ih input high voltage 0.65v dd v dd + 0.3 v v il input low voltage ?0.3 0.35v dd v i x input and output load current gnd v i v dd ? 55 a notes: 10. these characteristic pertain to the tap inputs (tms, tck, tdi and tdo). parallel load levels are specified in the electrical characteristics table. 11. overshoot: v ih (ac) < v ddq +0.85v (pulse width less than t cyc /2), undershoot: v il (ac) > ?1.5v (pulse width less than t cyc /2). 12. all voltage referenced to ground. [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 13 of 23 tap ac switching characteristics over the operating range [13, 14] parameter description min. max. unit t tcyc tck clock cycle time 50 ns t tf tck clock frequency 20 mhz t th tck clock high 20 ns t tl tck clock low 20 ns set-up times t tmss tms set-up to tck clock rise 5 ns t tdis tdi set-up to tck clock rise 5 ns t cs capture set-up to tck rise 5 ns hold times t tmsh tms hold after tck clock rise 5 ns t tdih tdi hold after clock rise 5 ns t ch capture hold after clock rise 5 ns output times t tdov tck clock low to tdo valid 10 ns t tdox tck clock low to tdo invalid 0 ns tap timing and test conditions [13] notes: 13. test conditions are specified using th e load in tap ac test conditions. t r /t f = 1 ns. 14. t cs and t ch refer to the set-up and hold time requirements of latching data from the boundary scan register. (a) tdo c l = 20 pf z 0 = 50 ? gnd 0.9v 50 ? 1.8v 0v all input pulses 0.9v test clock test mode select tck tms test data-in tdi test data-out t tcyc t tmsh t tl t th t tmss t tdis t tdih t tdov t tdox tdo [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 14 of 23 identification register definitions instruction field value description cy7c1292dv18 cy7c1294dv18 revision number (31:29) 000 000 version number. cypress device id (28:12) 11010011010010110 11010011010100110 defines the type of sram. cypress jedec id (11:1) 00000110100 00000110100 unique identification of sram vendor. id register presence (0) 1 1 indicat es the presence of an id register. scan register sizes register name bit size instruction 3 bypass 1 id 32 boundary scan cells 107 instruction codes instruction code description extest 000 captures the input/output ring contents. idcode 001 loads the id register with the vendor id code and places the register between tdi and tdo. this operation does not affect sram operation. sample z 010 captures the input/output co ntents. places the boundary scan register between tdi and tdo. forces all sram output drivers to a high-z state. reserved 011 do not use: this instruct ion is reserved for future use. sample/preload 100 captures the i nput/output ring contents. plac es the boundary scan register between tdi and tdo. does not affect the sram operation. reserved 101 do not use: this instruct ion is reserved for future use. reserved 110 do not use: this instruct ion is reserved for future use. bypass 111 places the bypass register between tdi and tdo. this operation does not affect sram operation. [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 15 of 23 boundary scan order bit # bump id bit # bump id bit # bump id bit # bump id 0 6r 27 11h 54 7b 81 3g 1 6p 28 10g 55 6b 82 2g 26n 299g 566a 831j 3 7p 30 11f 57 5b 84 2j 4 7n 31 11g 58 5a 85 3k 57r 329f 594a 863j 6 8r 33 10f 60 5c 87 2k 7 8p 34 11e 61 4b 88 1k 8 9r 35 10e 62 3a 89 2l 9 11p 36 10d 63 1h 90 3l 10 10p 37 9e 64 1a 91 1m 11 10n 38 10c 65 2b 92 1l 12 9p 39 11d 66 3b 93 3n 13 10m 40 9c 67 1c 94 3m 14 11n 41 9d 68 1b 95 1n 15 9m 42 11b 69 3d 96 2m 16 9n 43 11c 70 3c 97 3p 17 11l 44 9b 71 1d 98 2n 18 11m 45 10b 72 2c 99 2p 19 9l 46 11a 73 3e 100 1p 20 10l 47 internal 74 2d 101 3r 21 11k 48 9a 75 2e 102 4r 22 10k 49 8b 76 1e 103 4p 23 9j 50 7c 77 2f 104 5p 24 9k 51 6c 78 3f 105 5n 25 10j 52 8a 79 1g 106 5r 26 11j 53 7a 80 1f [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 16 of 23 power-up sequence in qdr-ii sram [16] qdr-ii srams must be powered up and initialized in a predefined manner to prevent undefined operations. power-up sequence ? apply power with doff tied high (all other inputs can be high or low) ?apply v dd before v ddq ?apply v ddq before v ref or at the same time as v ref ? provide stable power and clock (k, k ) for 1024 cycles to lock the dll. dll constraints ? dll uses k clock as its synchronizing input. the input should have low phase jitter, which is specified as t kc var . ? the dll will function at frequencies down to 80 mhz. ? if the input clock is unstable and the dll is enabled, then the dll may lock onto an incorrect frequency, causing unstable sram behavior. to avoid this, provide 1024 cycles stable clock to relock to the desired clock frequency. notes: 15. it is recommended that the doff pin be pulled high via a pull up resistor of 1kohm. 16. during power-up, when the doff is tied high, the dll gets locked after 1024 cycles of stable clock. power-up waveforms > 1024 stable clock start normal operation doff stabl e (< +/- 0.1v dc per 50ns ) fix high (or tied to v ddq ) k k ddq dd v v / ddq dd v v / clock start ( clock starts after stable ) ddq dd v v / ~ ~ ~ ~ unstable clock [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 17 of 23 maximum ratings (above which the useful life may be impaired.) storage temperature ............. .............. ...... ?65c to +150c ambient temperature with power applied........... .............. .............. ...... ?55c to +125c supply voltage on v dd relative to gnd........ ?0.5v to +2.9v supply voltage on v ddq relative to gnd ...... ?0.5v to +v dd dc voltage applied to outputs in high-z state .................................... ?0.5v to v ddq + 0.3v dc input voltage [11] ...............................?0.5v to v dd + 0.3v current into outputs (low).... ..................................... 20 ma static discharge voltage......... ........... ............ .......... > 2001v (per mil-std-883, method 3015) latch-up current.................................................... > 200 ma operating range range ambient temperature (t a )v dd [19] v ddq [19] com?l 0c to +70c 1.8 0.1 v 1.4v to v dd ind?l ?40c to +85c electrical characteristics over the operating range [12, 19] dc electrical ch aracteristics over the operating range parameter description test conditions min. typ. max. unit v dd power supply voltage 1.7 1.8 1.9 v v ddq i/o supply voltage 1.4 1.5 v dd v v oh output high voltage note 17 v ddq /2 ? 0.12 v ddq /2 + 0.12 v v ol output low voltage note 18 v ddq /2 ? 0.12 v ddq /2 + 0.12 v v oh(low) output high voltage i oh = ? 0.1 ma, nominal impedance v ddq ? 0.2 v ddq v v ol(low) output low voltage i ol = 0.1 ma, nominal impedance v ss 0.2 v v ih input high voltage [11] v ref + 0.1 v ddq +0.3 v v il input low voltage [11] ?0.3 v ref ? 0.1 v i x input leakage current gnd v i v ddq ? 55 a i oz output leakage current gnd v i v ddq, output disabled ? 55 a v ref input reference voltage [20] typical value = 0.75v 0.68 0.75 0.95 v i dd v dd operating supply v dd = max., i out = 0 ma, f = f max = 1/t cyc 167 mhz 500 ma 200 mhz 550 ma 250 mhz 600 ma i sb1 automatic power-down current max. v dd , both ports deselected, v in v ih or v in v il f = f max = 1/t cyc, inputs static 167 mhz 240 ma 200 mhz 260 ma 250 mhz 280 ma ac input requirements over the operating range parameter description test conditions min. typ. max. unit v ih input high voltage v ref + 0.2 ? ? v v il input low voltage ? ? v ref - 0.2 v capacitance [21] parameter description test conditions max. unit c in input capacitance t a = 25 c, f = 1 mhz, v dd = 1.8v v ddq = 1.5v 5pf c clk clock input capacitance 6 pf c o output capacitance 7 pf notes: 17. output are impedance controlled. i oh = ?(v ddq /2)/(rq/5) for values of 175 ? <= rq <= 350 ? s. 18. output are impedance controlled. i ol = (v ddq /2)/(rq/5) for values of 175 ? <= rq <= 350 ? . 19. power-up: assumes a linear ramp from 0v to v dd (min.) within 200 ms. during this time v ih < v dd and v ddq < v dd . 20. v ref (min.) = 0.68v or 0.46v ddq , whichever is larger, v ref (max.) = 0.95v or 0.54v ddq , whichever is smaller. 21. tested initially and after any design or process change that may affect these parameters. [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 18 of 23 note: 22. unless otherwise noted, test conditions assume signal transiti on time of 2v/ns, timing reference levels of 0.75v, vref = 0.7 5v, rq = 250 ? , v ddq = 1.5v, input pulse levels of 0.25v to 1.25v, and output loading of the specified i ol /i oh and load capacitance shown in (a) of ac test loads. thermal resistance [21] parameter description test conditions 165 fbga unit ja thermal resistance (junction to ambient) test conditions follow standard test methods and procedures for measuring thermal impedance, per eia/jesd51. 28.51 c/w jc thermal resistance (j unction to case) 5.91 c/w ac test loads and waveforms 1.25v 0.25v r = 50 ? 5pf all input pulses device r l = 50 ? z 0 = 50 ? v ref = 0.75v v ref = 0.75v [22] 0.75v under te s t 0.75v device under te s t output 0.75v v ref v ref output zq zq (a) slew rate = 2 v/ns rq = 250 ? (b) rq = 250 ? [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 19 of 23 switching characteristics over the operating range [22, 23] cypress parameter consortium parameter description 250 mhz 200 mhz 167 mhz unit min. max. min. max. min. max. t power t khkh v dd (typical) to the first access [24] 111ms t cyc t khkl k clock and c clock cycle time 4.0 6.3 5.0 7.9 6.0 7.9 ns t kh t klkh input clock (k/k and c/c ) high 1.6 ? 2.0 ? 2.4 ? ns t kl t khk h input clock (k/k and c/c ) low 1.6 ? 2.0 ? 2.4 ? ns t khk h t khch k clock rise to k clock rise and c to c rise (rising edge to rising edge) 1.8 ? 2.2 ? 2.7 ? ns t khch t khkh k/k clock rise to c/c clock rise (rising edge to rising edge) 0.0 1.8 0.0 2.2 0.0 2.7 ns set-up times t sa t avkh address set-up to clock (k/k ) rise 0.35 ? 0.4 ? 0.5 ? ns t sc t ivkh control set-up to k clock rise (rps , wps ) 0.35 ? 0.4 ? 0.5 ? ns t scddr t ivkh double data rate control set-up to clock (k/k ) rise (bws 0 , bws 1 , bws 3 , bws 4 ) 0.35 ? 0.4 ? 0.5 ? ns t sd t dvkh d [x:0] set-up to clock (k/k ) rise 0.35 ? 0.4 ? 0.5 ? ns hold times t ha t khax address hold after clock (k/k ) rise 0.35 ? 0.4 ? 0.5 ? ns t hc t khix control hold after k clock rise (rps , wps ) 0.35 ? 0.4 ? 0.5 ? ns t hcddr t khix double data rate control hold after clock (k/k ) rise (bws 0 , bws 1 , bws 3 , bws 4 ) 0.35 ? 0.4 ? 0.5 ? ns t hd t khdx d [x:0] hold after clock (k/k ) rise 0.35 ? 0.4 ? 0.5 ? ns output times t co t chqv c/c clock rise (or k/k in single clock mode) to data valid ? 0.45 ? 0.45 ? 0.50 ns t doh t chqx data output hold after output c/c clock rise (active to active) ?0.45 ? -0.45 ? -0.50 ? ns t ccqo t chcqv c/c clock rise to echo clock valid ? 0.45 ? 0.45 ? 0.50 ns t cqoh t chcqx echo clock hold after c/c clock rise ?0.45 ? ?0.45 ? ?0.50 ? ns t cqd t cqhqv echo clock high to data valid ? 0.30 ? 0.35 ? 0.40 ns t cqdoh t cqhqx echo clock high to data invalid ?0.30 ? ?0.35 ? ?0.40 ? ns t chz t chqz clock (c/c ) rise to high-z (active to high-z) [25,26] ? 0.45 ? 0.45 ? 0.50 ns t clz t chqx1 clock (c/c ) rise to low-z [25,26] ?0.45 ? ?0.45 ? ?0.50 ? ns dll timing t kc var t kc var clock phase jitter ? 0.20 ? 0.20 ? 0.20 ns t kc lock t kc lock dll lock time (k, c) 1024 ? 1024 ? 1024 ? cycles t kc reset t kc reset k static to dll reset 30 ? 30 ? 30 ? ns notes: 23. all devices can operate at clock frequencies as low as 119 mh z. when a part with a maximum frequency above 133 mhz is operat ing at a lower clock frequency, it requires the input timings of the frequency range in which it is being operated and will output data with the output timings of that frequency range. 24. this part has a voltage regulator internally; t power is the time that the power needs to be supplied above v dd minimum initially before a read or write operation can be initiated. 25. t chz , t clz , are specified with a load capacitance of 5 pf as in (b) of ac test loads. transition is measured 100 mv from steady-state voltage. 26. at any given voltage and temperature t chz is less than t clz and t chz less than t co . [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 20 of 23 switching waveforms [27, 28, 29] read/write/deselect sequence notes: 27. q00 refers to output from address a0. q01 refers to output from the next internal burst address following a0, i.e., a0 + 1. 28. output are disabled (high-z) one clock cycle after a nop. 29. in this example, if address a2 = a1,then data q20 = d10 and q2 1 = d11. write data is forwarded immediately as read results. this note applies to the whole diagram. k 12 34 58 10 6 7 k rps wps a d read read write write write nop read write nop 9 a0 t kh t khkh t kl t cyc tt hc t sa t ha t sd t hd sc t t sa t ha t sd t hd a6 a5 a3 a4 a1 a2 d30 d50 d51 d61 d31 d11 d10 d60 q c c dont care undefined t cq cq t khch t co t khch t clz chz t kh t kl q00 q01 q20 t khkh t cyc q21 q40 q41 t cqd t doh t ccqo t cqoh t ccqo t cqoh t cqdoh [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 21 of 23 ordering information not all of the speed, package and temperature ranges are a vailable. please contact your local sales representative or visit www.cypress.com for actual pr oducts offered. speed (mhz) ordering code package diagram package type operating range 167 cy7c1292dv18-167bzc 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) commercial cy7c1294dv18-167bzc cy7c1292dv18-167bzxc 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) lead-free cy7c1294dv18-167bzxc cy7c1292dv18-167bzi 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) industrial cy7c1294dv18-167bzi cy7c1292dv18-167bzxi 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) lead-free cy7c1294dv18-167bzxi 200 cy7c1292dv18-200bzc 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) commercial cy7c1294dv18-200bzc CY7C1292DV18-200BZXC 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) lead-free cy7c1294dv18-200bzxc cy7c1292dv18-200bzi 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) industrial cy7c1294dv18-200bzi cy7c1292dv18-200bzxi 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) lead-free cy7c1294dv18-200bzxi 250 cy7c1292dv18-250bzc 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) commercial cy7c1294dv18-250bzc cy7c1292dv18-250bzxc 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) lead-free cy7c1294dv18-250bzxc cy7c1292dv18-250bzi 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) industrial cy7c1294dv18-250bzi cy7c1292dv18-250bzxi 51-85180 165-ball fine pitch ball grid array (13 x 15 x 1.4 mm) lead-free cy7c1294dv18-250bzxi [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 22 of 23 ? cypress semiconductor corporation, 2006. the information contained herein is subject to change without notice. cypress semic onductor corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a cypress product. nor does it convey or imply any license under patent or ot her rights. cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agr eement with cypress. furthermore, cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to re sult in significant injury to the user. the inclusion of cypress products in life-support systems application implies that the manu facturer assumes all risk of such use and in doing so indemni fies cypress against all charges. qdr rams and quad data rate rams comprise a new family of products developed by cypress, hitachi, idt, nec, and samsung. all product and company names mentioned in this document are the tr ademarks of their respective holders. package diagram a 1 pin 1 corner 15.000.10 13.000.10 7.00 1.00 ?0.50 (165x) ?0.25mcab ?0.05 m c b a 0.15(4x) 0.350.06 seating plane 0.530.05 0.25 c 0.15 c pin1corner top view bottom view 2 3 4 5 6 7 8 9 10 10.00 14.00 b c d e f g h j k l m n 11 11 10 9 8 67 5 4 3 2 1 p r p r k m n l j h g f e d c b a a 15.000.10 13.000.10 b c 1.00 5.00 0.36 -0.06 +0.14 1.40 max. solder pad type : non-solder mask defined (nsmd) notes : package weight : 0.475g jedec reference : mo-216 / design 4.6c package code : bb0ac 51-85180-*a 165 fbga 13 x 15 x 1.40 mm bb165d/bw165d a 1 pin 1 corner 15.000.10 13.000.10 7.00 1.00 ?0.50 (165x) ?0.25 m c a b ?0.05 m c b a 0.15(4x) 0.350.06 seating plane 0.530.05 0.25 c 0.15 c pin 1 corner top view bottom view 2 3 4 5 6 7 8 9 10 10.00 14.00 b c d e f g h j k l m n 11 11 10 9 8 67 5 4 3 2 1 p r p r k m n l j h g f e d c b a a 15.000.10 13.000.10 b c 1.00 5.00 0.36 - 0.06 +0.14 1.40 max. solder pad type : non-solder mask defined (nsmd) notes : package weight : 0.475g jedec reference : mo-216 / design 4.6c package code : bb0ac 51-85180-*a 165-ball fbga (13 x 15 x 1.4 mm) (51-85180) [+] feedback
cy7c1292dv18 cy7c1294dv18 document #: 001-00350 rev. *a page 23 of 23 document history page document title: cy7c1292dv18/cy7c1294dv18 9-mbit qdr- ii? sram 2-word burst architecture document number: 001-00350 rev. ecn no. issue date orig. of change description of change ** 380737 see ecn syt new data sheet *a 485631 see ecn nxr converted from preliminary to final removed 300mhz speed bin. changed address of cypress semiconduc tor corporation on page# 1 from ?3901 north first street? to ?198 champion court? changed c/c pin description in the features section and pin description. modified the zq definition from alternately, this pin can be connected directly to v dd to alternately, this pin can be connected directly to v ddq. changed t th and t tl from 40 ns to 20 ns, changed t tmss , t tdis , t cs , t tmsh , t tdih , t ch from 10 ns to 5 ns and changed t tdov from 20 ns to 10 ns in tap ac switching characteristics table added power-up sequence details and waveforms. added foot notes #15 and 16 on page# 18. included maximum ratings for supply voltage on v ddq relative to gnd changed the maximum rating of ambient temperature with power applied from ?10c to +85c to ?55c to +125c changed the maximum ratings for dc input voltage from v ddq to v dd. changed the description of i x from input load current to input leakage current on page# 13. modified the i dd and i sb values modified test condition in footnote #20 on page# 19 from v ddq < v dd to v ddq < v dd. changed the min. value of t sc and t hc from 0.5ns to 0.35ns for 250 mhz and 0.6ns to 0.4ns for 200 mhz speed bins. changed the description of t sa from k clock rise to clock (k/k ) rise. changed the description of t sc and t hc from clock (k and k ) rise to k clock rise. replaced package name column with package diagram in the ordering information table. updated the ordering information table. [+] feedback

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