25/0251 CY7C056V CY7C057V 3.3V 16K/32K x 36 FLEx36™ Asynchronous Dual-Port Static RAM Features • Expandable data bus to 72 bits or more using Master/Slave Chip Select when using more than one device • On-Chip arbitration logic • Semaphores included to permit software handshaking between ports • INT flag for port-to-port communication • Byte Select on Left Port • Bus Matching on Right Port • Depth Expansion via dual chip enables • Pin select for Master or Slave • Commercial and Industrial Temperature Ranges • Compact package — 144-Pin TQFP (20 x 20 x 1.4 mm) • True dual-ported memory cells which allow simultaneous access of the same memory location • 16K x 36 organization (CY7C056V) • 32K x 36 organization (CY7C057V) • 0.25-micron CMOS for optimum speed/power • High-speed access: 12/15/20 ns • Low operating power — Active: ICC = 250 mA (typical) — Standby: ISB3 = 10 µA (typical) • Fully asynchronous operation • Automatic power-down — 172-Ball BGA (1.0-mm pitch) (15 x 15 x.51 mm) Logic Block Diagram R/WL B0–B3 CE0L CE1L R/WR Left Port Control Logic CEL OEL Right Port Control Logic 9 9 9 9 I/O0L–I/O8L I/O9L–I/O17L 9 I/O Control I/O18L–I/O26L I/O Control 9 [1] A0L–A13/14L 14/15 CER OER BA WA Bus Match 9 9 I/O27L–I/O35L Address Decode True Dual-Ported RAM Array 14/15 CE0R CE1R 9/18/36 I/OR BM SIZE Address Decode 14/15 [1] A0R–A13/14R 14/15 Interrupt Semaphore Arbitration SEMR SEML [2] [2] BUSYL INTL BUSYR INTR M/S Notes: 1. A0–A13 for 16K; A0–A14 for 32K devices. 2. BUSY is an output in Master mode and an input in Slave mode. For the most recent information, visit the Cypress web site at www.cypress.com Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600 Document #: 38-06055 Rev. ** Revised September 7, 2001 CY7C056V CY7C057V Functional Description The CY7C056V and CY7C057V are low-power CMOS 16K and 32K x 36 dual-port static RAMs. Various arbitration schemes are included on the devices to handle situations when multiple processors access the same piece of data. Two ports are provided, permitting independent, asynchronous access for reads and writes to any location in memory. The devices can be utilized as standalone 36-bit dual-port static RAMs or multiple devices can be combined in order to function as a 72-bit or wider master/slave dual-port static RAM. An M/S pin is provided for implementing 72-bit or wider memory applications without the need for separate master and slave devices or additional discrete logic. Application areas include interprocessor/multiprocessor designs, communications status buffering, and dual-port video/graphics memory. Each port has independent control pins: Chip Enable (CE)[3], Read or Write Enable (R/W), and Output Enable (OE). Two flags are provided on each port (BUSY and INT). BUSY signals that the port is trying to access the same location currently being accessed by the other port. The Interrupt Flag (INT) permits communication between ports or systems by means of a mail box. The semaphores are used to pass a flag, or token, from one port to the other to indicate that a shared resource is in use. The semaphore logic is comprised of eight shared latches. Only one side can control the latch (semaphore) at any time. Control of a semaphore indicates that a shared resource is in use. An automatic Power-Down feature is controlled independently on each port by Chip Select (CE0 and CE1) pins. The CY7C056V and CY7C057V are available in 144-Pin Thin Quad Plastic Flatpack (TQFP) and 172-Ball Ball Grid Array (BGA) packages. Note: 3. CE is LOW when CE0 ≤ VIL and CE1 ≥ VIH. Document #: 38-06055 Rev. ** Page 2 of 23 CY7C056V CY7C057V Pin Configurations 144-Pin Thin Quad Flatpack (TQFP) I/O33L I/O34L I/O35L A0L A1L A2L A3L A4L A5L A6L A7L B0 B1 B2 B3 OEL R/WL VDD VSS VSS CE0L CE1L M/S SEML INTL BUSYL A8L A9L A10L A11L A12L A13L [4] NC CY7C056V (16K x 36) CY7C057V (32K x 36) 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 I/O33R I/O34R I/O35R A0R A1R A2R A3R A4R A5R A6R A7R BM SIZE WA BA OER R/WR VDD VSS VDD CE0R CE1R VDD SEMR INTR BUSYR A8R A9R A10R A11R A12R A13R [5] NC I/O26R I/O25R I/O24R I/O8R VDD I/O18R I/O19R I/O20R I/O21R VSS I/O22R I/O23R I/O5R I/O6R I/O7R I/O5L VSS I/O4L I/O3L I/O2L I/O1L I/O0L I/O0R I/O1R I/O2R I/O3R I/O4R VSS I/O21L I/O20L I/O19L I/O18L VDD I/O8L I/O7L I/O6L I/O23L I/O22L VSS 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 I/O26L I/O25L I/O24L 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 144 143 142 141 140 139 138 137 136 135 134 133 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 I/O32L I/O31L VSS I/O30L I/O29L I/O28L I/O27L VDD I/O17L I/O16L I/O15L I/O14L VSS I/O13L I/O12L I/O11L I/O10L I/O9L I/O9R I/O10R I/O11R I/O12R I/O13R VSS I/O14R I/O15R I/O16R I/O17R VDD I/O27R I/O28R I/O29R I/O30R VSS I/O31R I/O32R Top View Notes: 4. This pin is A14L for CY7C057V. 5. This pin is A14R for CY7C057V. Document #: 38-06055 Rev. ** Page 3 of 23 CY7C056V CY7C057V Pin Configurations (continued) 172-Ball Ball Grid Array (BGA) Top View 1 2 3 4 5 6 7 8 9 10 11 12 13 14 A I/O32L I/O30L NC VSS I/O13L VDD I/O11L I/O11R VDD I/O13R VSS NC I/O30R I/O32R B A0L I/O33L I/O29 I/O17L I/O14L I/O12L I/O9L I/O9R C NC A1L I/O31L I/O27L NC I/O15L I/O10L I/O10R I/O15R D A2L A3L I/O35L I/O34L I/O28L I/O16L E A4L A5L NC B0L NC NC F VDD A6L A7L B1L NC G OEL B2L B3L H VSS R/WL J A9L K I/O17R I/O29R I/O33R A0R I/O27R I/O31R A1R NC I/O34R I/O35R A3R A2R NC BM NC A5R A4R NC SIZE A7R A6R VDD CE0L CE0R BA WA OER A8L CE1L CE1R A8R R/WR VSS A10L VSS M/S NC NC VDD VDD A10R A9R A11L A12L NC SEML NC NC NC SEMR NC A12R A11R L BUSYL A13L INTL I/O26L I/O25L I/O19L VSS VSS I/O19R I/O25R I/O26R INTR A13R BUSYR M NC NC[4] I/O22L I/O18L NC I/O7L I/O2L I/O2R I/O7R NC I/O18R I/O22R NC[5] NC N I/O24L I/O20L I/O8L I/O6L I/O5L I/O3L I/O0L I/O0R I/O3R I/O5R I/O6R I/O8R I/O20R I/O24R P I/O23L I/O21L NC VSS I/O4L VDD I/O1L I/O1R VDD I/O4R VSS NC I/O21R I/O23R Document #: 38-06055 Rev. ** VSS VSS I/O12R I/O14R NC I/O16R I/O28R NC NC Page 4 of 23 CY7C056V CY7C057V Selection Guide CY7C056V CY7C057V -12 CY7C056V CY7C057V -15 CY7C056V CY7C057V -20 Maximum Access Time (ns) 12 15 20 Typical Operating Current (mA) 250 240 230 Typical Standby Current for ISB1 (mA) (Both Ports TTL Level) 55 50 45 10 µA 10 µA 10 µA Typical Standby Current for ISB3 (µA) (Both Ports CMOS Level) Pin Definitions Left Port Right Port Description A0L–A13/14L A0R–A13/14R Address (A0–A13 for 16K; A0–A14 for 32K devices) SEML SEMR Semaphore Enable CE0L, CE1L CE0R, CE1R Chip Enable (CE is LOW when CE0 ≤ VIL and CE1 ≥ VIH) INTL INTR Interrupt Flag BUSYL BUSYR Busy Flag I/O0L–I/O35L I/O0R–I/O35R Data Bus Input/Output OEL OER Output Enable R/WL R/WR Read/Write Enable B0–B3 Byte Select Inputs. Asserting these signals enables read and write operations to the corresponding bytes of the memory array. BM, SIZE See Bus Matching for details. WA, BA See Bus Matching for details. M/S Master or Slave Select VSS Ground VDD Power Maximum Ratings Output Current into Outputs (LOW)............................. 20 mA (Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature .................................–65°C to +150°C Ambient Temperature with Power Applied.............................................–55°C to +125°C Supply Voltage to Ground Potential ............... –0.5V to +4.6V DC Voltage Applied to Outputs in High Z State ...........................–0.5V to VDD+0.5V [6] DC Input Voltage...................................–0.5V to VDD+0.5V Static Discharge Voltage .......................................... >2001V Latch-Up Current.................................................... >200 mA Operating Range Range Commercial Industrial Ambient Temperature VDD 0°C to +70°C 3.3V ± 165 mV –40°C to +85°C 3.3V ± 165 mV Shaded areas contain advance information. Note: 6. Pulse width < 20 ns. Document #: 38-06055 Rev. ** Page 5 of 23 CY7C056V CY7C057V Electrical Characteristics Over the Operating Range [7, 8] VOH Output HIGH Voltage (VDD = Min., IOH = –4.0 mA) VOL Output LOW Voltage (VDD = Min., IOL = +4.0 mA) 2.4 VIH Input HIGH Voltage Input LOW Voltage IOZ Output Leakage Current ICC Operating Current (VDD = Max., IOUT = 0 mA) Outputs Disabled Commercial ISB1 Standby Current (Both Ports TTL Level and Deselected) f = fMAX Commercial Standby Current (One Port TTL Level and Deselected) f = fMAX Commercial ISB3 Standby Current (Both Ports CMOS Level and Deselected) f =0 Commercial ISB4 Standby Current (One Port CMOS Level and Deselected) f = fMAX[9] Commercial 2.0 10 Max. V 0.4 2.0 250 385 Typ. 2.4 0.4 2.0 0.8 –10 Min. Max. Typ. Min. -20 2.4 0.4 VIL ISB2 Max. Description -15 Typ. Parameter Min. -12 10 V V 0.8 –10 Unit CY7C056V CY7C057V –10 0.8 V 10 µA 240 360 265 385 50 70 65 95 mA 180 240 175 230 165 210 mA 190 255 0.01 0.01 1 Industrial 55 75 Industrial Industrial 1 Industrial 160 210 Industrial 230 340 mA mA 45 65 mA mA 0.01 1 mA 0.01 1 155 200 145 180 mA mA 170 215 mA Capacitance[10] Parameter Description CIN Input Capacitance COUT Output Capacitance Test Conditions TA = 25°C, f = 1 MHz, VDD = 3.3V Max. Unit 10 pF 10 pF Notes: 7. Cross Levels are VDD – 0.2V< VZ<0.2V. 8. Deselection for a port occurs if CE0 is HIGH or if CE1 is LOW. 9. fMAX = 1/tRC = All inputs cycling at f = 1/tRC (except Output Enable). f = 0 means no address or control lines change. This applies only to inputs at CMOS level standby ISB3. 10. Tested initially and after any design or process changes that may affect these parameters. Document #: 38-06055 Rev. ** Page 6 of 23 CY7C056V CY7C057V AC Test Load and Waveforms OUTPUT Z0 = 50Ω C 3.3V R = 50Ω R1 = 590Ω [11] OUTPUT VTH = 1.5V C = 5 pF (b) Three-State Delay (Load 2) (a) Normal Load (Load 1) 3.0V ALL INPUT PULSES R2 = 435Ω VSS 10% 90% 10% 90% ≤ 3 ns ≤ 3 ns ∆ for access time (ns) 7 6 5 4 3 2 1 20[12] 30 60 80 100 200 Capacitance (pF) (b) Load Derating Curve Notes: 11. External AC Test Load Capacitance = 10 pF. 12. (Internal I/O pad Capacitance = 10 pF) + AC Test Load. Document #: 38-06055 Rev. ** Page 7 of 23 CY7C056V CY7C057V Switching Characteristics Over the Operating Range[13] CY7C056V CY7C057V -15 -12 Parameter Description Min. Max. Min. -20 Max. Min. Max. Unit Read Cycle tRC Read Cycle Time 12 tAA Address to Data Valid tOHA Output Hold From Address Change tACE[3, 14] CE LOW to Data Valid 12 15 20 ns tDOE OE LOW to Data Valid 8 10 12 ns tLZOE[3, 15, 16, 17] tHZOE[3, 15, 16, 17] tLZCE[3, 13, 16, 17] tHZCE[3, 15, 16, 17] OE Low to Low Z tLZBE Byte Enable to Low Z tHZBE Byte Enable to High Z tPU[3, 17] tPD[3, 17] tABE[14] CE LOW to Power-Up 12 3 15 3 3 3 10 0 ns 12 10 3 0 ns ns 12 10 ns ns 0 3 3 20 10 10 ns 3 0 10 CE HIGH to High Z 20 3 0 OE HIGH to High Z CE LOW to Low Z 15 ns ns 12 0 ns ns CE HIGH to Power-Down 12 15 20 ns Byte Enable Access Time 12 15 20 ns Write Cycle tWC Write Cycle Time 12 15 20 ns tSCE[3, 14] CE LOW to Write End 10 12 15 ns tAW Address Valid to Write End 10 12 15 ns tHA Address Hold From Write End 0 0 0 ns tSA[14] Address Set-Up to Write Start 0 0 0 ns tPWE Write Pulse Width 10 12 15 ns tSD Data Set-Up to Write End 10 10 15 ns tHD Data Hold From Write End 0 0 0 ns tHZWE[16, 17] tLZWE[16, 17] tWDD[18] tDDD[18] R/W LOW to High Z R/W HIGH to Low Z 10 3 10 3 12 3 ns ns Write Pulse to Data Delay 25 30 45 ns Write Data Valid to Read Data Valid 20 25 30 ns Notes: 13. Test conditions assume signal transition time of 3 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V, and output loading of the specified IOI/IOH and 10-pF load capacitance. 14. To access RAM, CE = L and SEM = H. To access semaphore, CE = H and SEM = L. Either condition must be valid for the entire tSCE time. 15. At any given temperature and voltage condition for any given device, tHZCE is less than tLZCE and tHZOE is less than tLZOE. 16. Test conditions used are Load 2. 17. This parameter is guaranteed by design, but it is not production tested. For information on port-to-port delay through RAM cells from writing port to reading port, refer to Read Timing with Busy waveform. 18. For information on port-to-port delay through RAM cells from writing port to reading port, refer to Read Timing with Busy waveform. Document #: 38-06055 Rev. ** Page 8 of 23 CY7C056V CY7C057V Switching Characteristics Over the Operating Range[13] (continued) CY7C056V CY7C057V -15 -12 Parameter Description Min. Max. Min. -20 Max. Min. Max. Unit [19] Busy Timing tBLA BUSY LOW from Address Match 12 15 20 ns tBHA BUSY HIGH from Address Mismatch 12 15 20 ns tBLC BUSY LOW from CE LOW 12 15 20 ns Note: 19. Test conditions used are Load 1. Document #: 38-06055 Rev. ** Page 9 of 23 CY7C056V CY7C057V Switching Characteristics Over the Operating Range[13] (continued) CY7C056V CY7C057V -15 -12 Parameter Description Min. Max. Min. -20 Max. Min. Max. Unit 20 ns [19] Busy Timing tBHC BUSY HIGH from CE HIGH 12 15 tPS Port Set-Up for Priority 5 5 5 ns tWB R/W LOW after BUSY (Slave) 0 0 0 ns tWH R/W HIGH after BUSY HIGH (Slave) 11 13 15 ns tBDD[20] BUSY HIGH to Data Valid 12 15 20 ns [19] Interrupt Timing tINS INT Set Time 12 15 20 ns tINR INT Reset Time 12 15 20 ns Semaphore Timing tSOP SEM Flag Update Pulse (OE or SEM) 10 10 10 ns tSWRD SEM Flag Write to Read Time 5 5 5 ns tSPS SEM Flag Contention Window 5 5 5 ns tSAA SEM Address Access Time Data Retention Mode The CY7C056V and CY7C057V are designed with battery backup in mind. Data retention voltage and supply current are guaranteed over temperature. The following rules ensure data retention: 1. Chip Enable (CE)[3] must be held HIGH during data retention, within VDD to VDD – 0.2V. 12 15 20 ns Timing Data Retention Mode VCC 3.15V VCC > 2.0V 3.15V VCC to VCC – 0.2V CE tRC V IH 2. CE must be kept between VDD – 0.2V and 70% of VDD during the power-up and power-down transitions. 3. The RAM can begin operation >tRC after VDD reaches the minimum operating voltage (3.15 volts). Parameter ICCDR1 Test Conditions[21] @ VDDDR = 2V Max. Unit 50 µA Notes: 20. tBDD is a calculated parameter and is the greater of tWDD–tPWE (actual) or tDDD–tSD (actual). 21. CE = VDD, Vin = VSS to VDD, TA = 25°C. This parameter is guaranteed but not tested. Document #: 38-06055 Rev. ** Page 10 of 23 CY7C056V CY7C057V Switching Waveforms Read Cycle No. 1 (Either Port Address Access)[22, 23, 24] tRC ADDRESS tOHA DATA OUT tAA tOHA PREVIOUS DATA VALID DATA VALID Read Cycle No. 2 (Either Port CE/OE Access)[22, 25, 26] tACE CE0, CE1, B0, B1, SELECT VALID B2, B3, WA, BA tDOE OE tHZCE tHZOE tLZOE DATA VALID DATA OUT tLZCE tPU CURRENT tPD ICC ISB Read Cycle No. 3 (Either Port)[22, 24, 25, 26] tRC ADDRESS tAA tOHA B0, B1, B2, B3, WA, BA BYTE SELECT VALID tHZCE tLZCE tABE CE0, CE1 CHIP SELECT VALID tACE tHZCE tLZCE DATA OUT Notes: 22. R/W is HIGH for read cycles. 23. Device is continuously selected. CE0 = VIL, CE1=VIH, and B0, B1, B2, B3, WA, BA are valid. This waveform cannot be used for semaphore reads. 24. OE = VIL. 25. Address valid prior to or coinciding with CE0 transition LOW and CE1 transition HIGH. 26. To access RAM, CE0 = VIL, CE1=VIH, B0, B1, B2, B3, WA, BA are valid, and SEM = VIH. To access semaphore, CE0 = VIH, CE1=VIL and SEM = VIL or CE0 and SEM=VIL, and CE1= B0 = B1 = B2 = B3, =VIH. Document #: 38-06055 Rev. ** Page 11 of 23 CY7C056V CY7C057V Switching Waveforms (continued) Write Cycle No. 1: R/W Controlled Timing[27, 28, 29, 30] tWC ADDRESS tHZOE [33] OE tAW [31, 32] CHIP SELECT VALID CE0, CE1 tPWE[30] tSA tHA R/W tHZWE[33] DATA OUT tLZWE NOTE 34 NOTE 34 tSD tHD DATA IN Write Cycle No. 2: CE Controlled Timing[27, 28, 29, 35] tWC ADDRESS tAW [31, 32] CHIP SELECT VALID CE0, CE1 tSA tSCE tHA R/W tSD tHD DATA IN Notes: 27. R/W must be HIGH during all address transitions. 28. A write occurs during the overlap (tSCE or tPWE) of CE0=VIL and CE1=VIH or SEM=VIL and B0–3 LOW. 29. tHA is measured from the earlier of CE0/CE1 or R/W or (SEM or R/W) going HIGH at the end of Write Cycle. 30. If OE is LOW during a R/W controlled write cycle, the write pulse width must be the larger of tPWE or (tHZWE + tSD) to allow the I/O drivers to turn off and data to be placed on the bus for the required tSD. If OE is HIGH during an R/W controlled write cycle, this requirement does not apply and the write pulse can be as short as the specified tPWE. 31. To access RAM, CE0 = VIL, CE1=SEM = VIH. 32. To access byte B0, CE0 = VIL, B0 = VIL, CE1=SEM = VIH. To access byte B1, CE0 = VIL, B1 = VIL, CE1=SEM = VIH. To access byte B2, CE0 = VIL, B2 = VIL, CE1=SEM = VIH. To access byte B3, CE0 = VIL, B3 = VIL, CE1=SEM = VIH. 33. Transition is measured ±150 mV from steady state with a 5-pF load (including scope and jig). This parameter is sampled and not 100% tested. 34. During this period, the I/O pins are in the output state, and input signals must not be applied. 35. If the CE0 LOW and CE1 HIGH or SEM LOW transition occurs simultaneously with or after the R/W LOW transition, the outputs remain in the high-impedance state. Document #: 38-06055 Rev. ** Page 12 of 23 CY7C056V CY7C057V Switching Waveforms (continued) Semaphore Read After Write Timing, Either Side[36] tSAA A 0–A 2 VALID ADRESS VALID ADRESS tAW tACE tHA SEM tOHA tSCE tSOP tSD I/O 0 DATAIN VALID tSA tPWE DATAOUT VALID tHD R/W tSWRD tDOE tSOP OE WRITE CYCLE READ CYCLE Timing Diagram of Semaphore Contention[37, 38, 39] A0L –A 2L MATCH R/WL SEM L tSPS A 0R –A 2R MATCH R/WR SEMR Notes: 36. CE0 = HIGH and CE1 = LOW for the duration of the above timing (both write and read cycle). 37. I/O0R = I/O0L = LOW (request semaphore); CE0R = CE0L = HIGH and CE1R = CE1L=LOW. 38. Semaphores are reset (available to both ports) at cycle start. 39. If tSPS is violated, the semaphore will definitely be obtained by one side or the other, but which side will get the semaphore is unpredictable. Document #: 38-06055 Rev. ** Page 13 of 23 CY7C056V CY7C057V Switching Waveforms (continued) Timing Diagram of Write with BUSY (M/S=HIGH)[40] tWC ADDRESS R MATCH tPWE R/WR tHD tSD DATA INR VALID tPS ADDRESS L MATCH tBLA tBHA BUSY L tBDD tDDD DATA OUTL VALID tWDD Write Timing with Busy Input (M/S=LOW) tPWE R/W BUSY tWB tWH Note: 40. CE0L = CE0R = LOW; CE1L = CE1R = HIGH. Document #: 38-06055 Rev. ** Page 14 of 23 CY7C056V CY7C057V Switching Waveforms (continued) Busy Timing Diagram No. 1 (CE Arbitration)[41] CELValid First: ADDRESS L, R ADDRESS MATCH CE0L, CE1L CHIP SELECT VALID tPS CE0R, CE1R CHIP SELECT VALID tBLC tBHC BUSY R CER ValidFirst: ADDRESS L, R ADDRESS MATCH CE0L, CE1L CHIP SELECT VALID tPS CE0R, CE1R CHIP SELECT VALID tBLC tBHC BUSY L Busy Timing Diagram No. 2 (Address Arbitration)[41] Left Address Valid First: tRC or tWC ADDRESS L ADDRESS MATCH ADDRESS MISMATCH tPS ADDRESS R tBLA tBHA BUSY R Right Address Valid First: tRC or tWC ADDRESS R ADDRESS MATCH ADDRESS MISMATCH tPS ADDRESS L tBLA tBHA BUSY L Note: 41. If tPS is violated, the busy signal will be asserted on one side or the other, but there is no guarantee to which side BUSY will be asserted. Document #: 38-06055 Rev. ** Page 15 of 23 CY7C056V CY7C057V Switching Waveforms (continued) Interrupt Timing Diagrams Left Side Sets INTR : ADDRESS L tWC WRITE 3FFF (7FFF for CY7C057V) tHA[42] CE0L, CE1L CHIP SELECT VALID R/W L INT R tINS [43] Right Side Clears INT R : tRC READ 3FFF (7FFF for CY7C057V) ADDRESSR CHIP SELECT VALID CE0R, CE1R tINR [43] R/WR OE R INT R Right Side Sets INT L: tWC ADDRESSR WRITE 3FFE (7FFE for CY7C057V) tHA[42] CE0R, CE1R CHIP SELECT VALID R/W R INT L [43] tINS Left Side Clears INT L: tRC READ 3FFE (7FFF for CY7C057V) ADDRESS L CE0L,CE1L CHIP SELECT VALID tINR[43] R/W L OE L INT L Notes: 42. tHA depends on which enable pin (CE0L/CE1L or R/WL) is deasserted first. 43. tINS or tINR depends on which enable pin (CE0L/CE1L or R/WL) is asserted last. Document #: 38-06055 Rev. ** Page 16 of 23 CY7C056V CY7C057V Architecture The CY7C056V and CY7C057V consist of an array of 16K and 32K words of 36 bits each of dual-port RAM cells, I/O and address lines, and control signals (CE0/CE1, OE, R/W). These control pins permit independent access for reads or writes to any location in memory. To handle simultaneous writes/reads to the same location, a BUSY pin is provided on each port. Two Interrupt (INT) pins can be utilized for port-to-port communication. Two Semaphore (SEM) control pins are used for allocating shared resources. With the M/S pin, the devices can function as a master (BUSY pins are outputs) or as a slave (BUSY pins are inputs). The devices also have an automatic power-down feature controlled by CE0/CE1. Each port is provided with its own Output Enable control (OE), which allows data to be read from the device. Functional Description Write Operation Data must be set up for a duration of tSD before the rising edge of R/W in order to guarantee a valid write. A write operation is controlled by either the R/W pin (see Write Cycle No. 1 waveform) or the CE0 and CE1 pins (see Write Cycle No. 2 waveform). Required inputs for non-contention operations are summarized in Table 1. If a location is being written to by one port and the opposite port attempts to read that location, a port-to-port flowthrough delay must occur before the data is read on the output; otherwise the data read is not deterministic. Data will be valid on the port tDDD after the data is presented on the other port. Read Operation When reading the device, the user must assert both the OE and CE[3] pins. Data will be available tACE after CE or tDOE after OE is asserted. If the user wishes to access a semaphore flag, then the SEM pin must be asserted instead of the CE[3] pin, and OE must also be asserted. Interrupts The upper two memory locations may be used for message passing. The highest memory location (3FFF for the CY7C056V, 7FFF for the CY7C057V) is the mailbox for the right port and the second-highest memory location (3FFE for the CY7C056V, 7FFE for the CY7C057V) is the mailbox for the left port. When one port writes to the other port’s mailbox, an interrupt is generated to the owner. The interrupt is reset when the owner reads the contents of the mailbox. The message is user defined. Each port can read the other port’s mailbox without resetting the interrupt. The active state of the busy signal (to a port) prevents the port from setting the interrupt to the winning port. Also, an active busy to a port prevents that port from reading its own mailbox and, thus, resetting the interrupt to it. If an application does not require message passing, do not connect the interrupt pin to the processor’s interrupt request input pin. The operation of the interrupts and their interaction with Busy are summarized in Table 2. Document #: 38-06055 Rev. ** Busy The CY7C056V and CY7C057V provide on-chip arbitration to resolve simultaneous memory location access (contention). If both ports’ Chip Enables[3] are asserted and an address match occurs within tPS of each other, the busy logic will determine which port has access. If tPS is violated, one port will definitely gain permission to the location, but it is not predictable which port will get that permission. BUSY will be asserted tBLA after an address match or tBLC after CE is taken LOW. Master/Slave A M/S pin is provided in order to expand the word width by configuring the device as either a master or a slave. The BUSY output of the master is connected to the BUSY input of the slave. This will allow the device to interface to a master device with no external components. Writing to slave devices must be delayed until after the BUSY input has settled (tBLC or tBLA), otherwise, the slave chip may begin a write cycle during a contention situation. When tied HIGH, the M/S pin allows the device to be used as a master and, therefore, the BUSY line is an output. BUSY can then be used to send the arbitration outcome to a slave. Semaphore Operation The CY7C056V and CY7C057V provide eight semaphore latches, which are separate from the dual-port memory locations. Semaphores are used to reserve resources that are shared between the two ports. The state of the semaphore indicates that a resource is in use. For example, if the left port wants to request a given resource, it sets a latch by writing a zero to a semaphore location. The left port then verifies its success in setting the latch by reading it. After writing to the semaphore, SEM or OE must be deasserted for tSOP before attempting to read the semaphore. The semaphore value will be available tSWRD + tDOE after the rising edge of the semaphore write. If the left port was successful (reads a 0), it assumes control of the shared resource, otherwise (reads a 1) it assumes the right port has control and continues to poll the semaphore. When the right side has relinquished control of the semaphore (by writing a 1), the left side will succeed in gaining control of the semaphore. If the left side no longer requires the semaphore, a one is written to cancel its request. Semaphores are accessed by asserting SEM LOW. The SEM pin functions as a chip select for the semaphore latches. For normal semaphore access, CE[3] must remain HIGH during SEM LOW. A CE active semaphore access is also available. The semaphore may be accessed through the right port with CE0R/CE1R active by asserting the Bus Match Select (BM) pin LOW and asserting the Bus Size Select (SIZE) pin HIGH. The semaphore may be accessed through the left port with CE0L/CE1L active by asserting all B0–3 Byte Select pins HIGH. A0–2 represents the semaphore address. OE and R/W are used in the same manner as a normal memory access. When writing or reading a semaphore, the other address pins have no effect. When writing to the semaphore, only I/O0 is used. If a zero is written to the left port of an available semaphore, a 1 will appear at the same semaphore address on the right port. That semaphore can now only be modified by the port showing 0 (the left port in this case). If the left port now relinquishes control by writing a 1 to the semaphore, the semaphore will be set to 1 for both ports. However, if the right port had requested the semaphore (written a 0) while the left port had control, the right port would immediately own the semaphore as soon as the left port released it. Table 3 shows sample semaphore operations. Page 17 of 23 CY7C056V CY7C057V Table 1. Non-Contending Read/Write[3] Inputs Outputs CE R/W OE B0, B1, B2, B3 SEM I/O0–I/O35 H X X X H High Z Deselected: Power-Down X X X All H H High Z Deselected: Power-Down L L X H/L H Data In and High Z L L X All L H Data In L H L H/L H Data Out and High Z L H L All L H Data Out X X H X X High Z H H L X L Data Out Read Data in Semaphore Flag X H L All H L Data Out Read Data in Semaphore Flag H X X L Data In Write DIN0 into Semaphore Flag X X All H L Data In Write DIN0 into Semaphore Flag X Any L L L X Operation Write to Selected Bytes Only Write to All Bytes Read Selected Bytes Only Read All Bytes Outputs Disabled Not Allowed Table 2. Interrupt Operation Example (assumes BUSYL = BUSYR = HIGH)[3, 44] Left Port Function Right Port R/WL CEL OEL A0L–13L INTL R/WR CER OER A0R–13R INTR Set Right INTR Flag L L X 3FFF X X X X X L[46] Reset Right INTR Flag X X X X X X L L 3FFF H[45] Set Left INTL Flag X X X X L[45] L L X 3FFE X [46] X X X X X Reset Left INTL Flag X L L 3FFE H Table 3. Semaphore Operation Example Function I/O0–I/O8 Left I/O0–I/O8 Right Status No Action 1 1 Semaphore Free Left Port Writes 0 to Semaphore 0 1 Left Port Has Semaphore Token Right Port Writes 0 to Semaphore 0 1 No Change. Right Side Has No Write Access to Semaphore Left Port Writes 1 to Semaphore 1 0 Right Port Obtains Semaphore Token Left Port Writes 0 to Semaphore 1 0 No Change. Left Port Has No Write Access to Semaphore Right Port Writes 1 to Semaphore 0 1 Left Port Obtains Semaphore Token Left Port Writes 1 to Semaphore 1 1 Semaphore Free Right Port Writes 0 to Semaphore 1 0 Right Port Has Semaphore Token Right Port Writes 1 to Semaphore 1 1 Semaphore Free Left Port Writes 0 to Semaphore 0 1 Left Port Has Semaphore Token Left Port Writes 1 to Semaphore 1 1 Semaphore Free Notes: 44. A0L–14L and A0R–14R, 7FFF/7FFE for the CY7C057V. 45. If BUSYR=L, then no change. 46. If BUSYL=L, then no change. Document #: 38-06055 Rev. ** Page 18 of 23 CY7C056V CY7C057V Right Port Configuration [47, 48, 49] BM SIZE Configuration I/O Pins Used 0 0 x36 (Standard) I/O0–35 0 1 x36 (CE Active SEM Mode) I/O0–35 1 0 x18 I/O0–17 1 1 x9 I/O0–8 Right Port Operation Configuration WA BA Data Accessed[50] I/O Pins Used x36 X X DQ0–35 I/O0–35 x18 0 X DQ0–17 I/O0–17 x18 1 X DQ18–35 I/O0–17 x9 0 0 DQ0–8 I/O0–8 x9 0 1 DQ9–17 I/O0–8 x9 1 0 DQ18–26 I/O0–8 x9 1 1 DQ27–35 I/O0–8 Left Port Operation Control Pin Effect B0 I/O0–8 Byte Control B1 I/O9–17 Byte Control B2 I/O18–26 Byte Control B3 I/O27–35 Byte Control Notes: 47. BM and SIZE must be configured one clock cycle before operation is guaranteed. 48. In x36 mode WA and BA pins are “Don’t Care.” 49. In x18 mode BA pin is a “Don’t Care.” 50. DQ represents data output of the chip. When reading a semaphore, data lines 0 through 8 output the semaphore value. The read value is latched in an output register to prevent the semaphore from changing state during a write from the other port. If both ports attempt to access the semaphore within tSPS of each other, the semaphore will definitely be obtained by one side or the other, but there is no guarantee which side will control the semaphore. When reading a semaphore, data lines 0 through 8 output the semaphore value. The read value is latched in an output register to prevent the semaphore from changing state during a write from the other port. If both ports attempt to access the Document #: 38-06055 Rev. ** semaphore within tSPS of each other, the semaphore will definitely be obtained by one side or the other, but there is no guarantee which side will control the semaphore. When reading a semaphore, data lines 0 through 8 output the semaphore value. The read value is latched in an output register to prevent the semaphore from changing state during a write from the other port. If both ports attempt to access the semaphore within tSPS of each other, the semaphore will definitely be obtained by one side or the other, but there is no guarantee which side will control the semaphore. Page 19 of 23 CY7C056V CY7C057V Bus Match Operation Long-Word (36-bit) Operation The right port of the CY7C057V 32Kx36 dual-port SRAM can be configured in a 36-bit long-word, 18-bit word, or 9-bit byte format for data I/O. The data lines are divided into four lanes, each consisting of 9 bits (byte-size data lines). x36 / CY7C056V CY7C057V 16K/32Kx36 Dual Port 9 / 9 / 9 / US MODE BA WA x9, x18, x36 / 9 / BM SIZE The Bus Match Select (BM) pin works with Bus Size Select (SIZE) to select bus width (long-word, word, or byte) for the right port of the dual-port device. The data sequencing arrangement is selected using the Word Address (WA) and Byte Address (BA) input pins. A logic “0” applied to both the Bus Match Select (BM) pin and to the Bus Size Select (SIZE) pin will select long-word (36-bit) operation. A logic “1” level applied to the Bus Match Select (BM) pin will enable either byte or word bus width operation on the right port I/Os depending on the logic level applied to the SIZE pin. The level of Bus Match Select (BM) must be static throughout device operation. Normally, the Bus Size Select (SIZE) pin would have no standard-cycle application when BM = LOW and the device is in long-word (36-bit) operation. A “special” mode has been added however to disable ALL right port I/Os while the chip is active. This I/O disable mode is implemented when SIZE is forced to a logic “1” while BM is at a logic “0”. It allows the busmatched port to support a chip enable “Don’t Care” semaphore read/write access similar to that provided on the left port of the device when all Byte Select (B0–3) control inputs are deselected. The Bus Size Select (SIZE) pin selects either a byte or word data arrangement on the right port when the Bus Match Select (BM) pin is HIGH. A logic “1” on the SIZE pin when the BM pin is HIGH selects a byte bus (9-bit) data arrangement). A logic “0” on the SIZE pin when the BM pin is HIGH selects a word bus (18-bit) data arrangement. The level of the Bus Size Select (SIZE) must also be static throughout normal device operation. Bus Match Select (BM) and Bus Size Select (SIZE) set to a logic “0” will enable standard cycle long-word (36-bit) operation. In this mode, the right port’s I/O operates essentially in an identical fashion as does the left port of the dual-port SRAM. However no Byte Select control is available. All 36 bits of the long-word are shifted into and out of the right port’s I/O buffer stages. All read and write timing parameters may be identical with respect to the two data ports. When the right port is configured for a long-word size, Word Address (WA), and Byte Address (BA) pins have no application and their inputs are “Don’t Care”[51] for the external user. Word (18-bit) Operation Word (18-bit) bus sizing operation is enabled when Bus Match Select (BM) is set to a logic “1” and the Bus SIze Select (SIZE) pin is set to a logic “0.” In this mode, 18 bits of data are ported through I/O0R–17R. The level applied to the Word Address (WA) pin during word bus size operation determines whether the most-significant or least-significant data bits are ported through the I/O0R–17R pins in an Upper Word/Lower Word select fashion (note that when the right port is configured for word size operation, the Byte Address pin has no application and its input is “Don’t Care”[51]). Device operation is accomplished by treating the WA pin as an additional address input and using standard cycle address and data setup/hold times. When transferring data in word (18-bit) bus match format, the unused I/O18R–35R pins are three-stated. Byte (9-bit) Operation Byte (9-bit) bus sizing operation is enabled when Bus Match Select (BM) is set to a logic “1” and the Bus Size Select (SIZE) pin is set to a logic “1.” In this mode, data is ported through I/O0R–8R in four groups of 9-bit bytes. A particular 9-bit byte group is selected according to the levels applied to the Word Address (WA) and Byte Address (BA) input pins. I/Os Rank WA BA I/O27R–35R Upper-MSB 1 1 I/O18R–26R Lower-MSB 1 0 I/O9R–17R Upper-MSB 0 1 I/O0R–8R Lower-MSB 0 0 Device operation is accomplished by treating the Word Address (WA) pin and the Byte Address (BA) pins as additional address inputs having standard cycle address and data setup/hold times. When transferring data in byte (9-bit) bus match format, the unused I/O9R–35R pins are three-stated. Note: 51. Even though a logic level applied to a “Don’t Care” input will not change the logical operation of the dual-port, inputs that are temporarily a “Don’t Care” (along with unused inputs) must not be allowed to float. They must be forced either HIGH or LOW. Document #: 38-06055 Rev. ** Page 20 of 23 CY7C056V CY7C057V Ordering Information Speed (ns) Ordering Code 12 CY7C056V-12AC 15 CY7C056V-15AC A144 BB172 CY7C056V-12BBC A144 CY7C056V-15BBC 20 BB172 CY7C056V-20AC A144 CY7C056V-20BBC Speed (ns) CY7C057V-12AC 15 CY7C057V-15AC CY7C057V-12BBC CY7C057V-15AI 20 BB172 Ordering Code 12 Package Name Package Name A144 BB172 Package Type 144-Pin Thin Quad Flat Pack Operating Range Commercial 172-Ball Ball Grid Array (BGA) Commercial 144-Pin Thin Quad Flat Pack Commercial 172-Ball Ball Grid Array (BGA) Commercial 144-Pin Thin Quad Flat Pack Commercial 172-Ball Ball Grid Array (BGA) Commercial Package Type 144-Pin Thin Quad Flat Pack Operating Range Commercial 172-Ball Ball Grid Array (BGA) Commercial A144 144-Pin Thin Quad Flat Pack Commercial A144 144-Pin Thin Quad Flat Pack Industrial CY7C057V-15BBC BB172 172-Ball Ball Grid Array (BGA) Commercial CY7C057V-15BBI BB172 172-Ball Ball Grid Array (BGA) Industrial CY7C057V-20AC A144 144-Pin Thin Quad Flat Pack Commercial 172-Ball Ball Grid Array (BGA) Commercial CY7C057V-20BBC BB172 Package Diagrams 144-Pin Plastic Thin Quad Flat Pack (TQFP) A144 51-85047-A Document #: 38-06055 Rev. ** Page 21 of 23 CY7C056V CY7C057V Package Diagrams (continued) 172-Ball BGA BB172 Document #: 38-06055 Rev. ** Page 22 of 23 © Cypress Semiconductor Corporation, 2001. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges. CY7C056V CY7C057V Document Title: CY7C056V/CY7C057V 3.3V 16K/32K x 36 FLEx36™ Asynchronous Dual-Port Static RAM Document Number: 38-06055 REV. ECN NO. Issue Date Orig. of Change ** 110214 12/16/01 SZV Document #: 38-06055 Rev. ** Description of Change Change from Spec number: 38-00742 to 38-06055 Page 23 of 23