IDT72V211L15J

3.3 VOLT CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 IDT72V201, IDT72V211 IDT72V221, IDT72V231 IDT72V241, IDT72V251 FEATURES: • • • • • • • • • • • • • • • • • 256 x 9-bit organization IDT72V201 512 x 9-bit organization IDT72V211 1,024 x 9-bit organization IDT72V221 2,048 x 9-bit organization IDT72V231 4,096 x 9-bit organization IDT72V241 8,192 x 9-bit organization IDT72V251 10 ns read/write cycle time 5V input tolerant Read and Write clocks can be independent Dual-Ported zero fall-through time architecture Empty and Full Flags signal FIFO status Programmable Almost-Empty and Almost-Full flags can be set to any depth Programmable Almost-Empty and Almost-Full flags default to Empty+7, and Full-7, respectively Output Enable puts output data bus in high-impedance state Advanced submicron CMOS technology Available in 32-pin plastic leaded chip carrier (PLCC) and 32-pin plastic Thin Quad FlatPack (TQFP) Industrial temperature range (–40°C to +85°C) is available DESCRIPTION: The IDT72V201/72V211/72V221/72V231/72V241/72V251 SyncFIFOs™ are very high-speed, low-power First-In, First-Out (FIFO) memories with clocked read and write controls. The architecture, functional operation and pin assignments are identical to those of the IDT72201/72211/72221/72231/ 72241/72251, but operate at a power supply voltage (Vcc) between 3.0V and 3.6V. These devices have a 256, 512, 1,024, 2,048, 4,096 and 8,192 x 9-bit memory array, respectively. These FIFOs are applicable for a wide variety of data buffering needs such as graphics, local area networks and interprocessor communication. These FIFOs have 9-bit input and output ports. The input port is controlled by a free-running clock (WCLK), and two Write Enable pins (WEN1, WEN2). Data is written into the Synchronous FIFO on every rising clock edge when the Write Enable pins are asserted. The output port is controlled by another clock pin (RCLK) and two Read Enable pins ( REN1, REN2). The Read Clock can be tied to the Write Clock for single clock operation or the two clocks can run asynchronous of one another for dualclock operation. An Output Enable pin (OE) is provided on the read port for three-state control of the output. The Synchronous FIFOs have two fixed flags, Empty (EF) and Full (FF). Two programmable flags, Almost-Empty (PAE) and Almost-Full (PAF), are provided for improved system control. The programmable flags default to Empty+7 and Full-7 for PAE and PAF, respectively. The programmable flag offset loading is controlled by a simple state machine and is initiated by asserting the Load pin (LD). These FIFOs are fabricated using IDT's high-speed submicron CMOS technology. FUNCTIONAL BLOCK DIAGRAM WCLK WEN1 WEN2 INPUT REGISTER OFFSET REGISTER EF PAE PAF FF D0 - D8 LD WRITE CONTROL LOGIC RAM ARRAY 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9, 8,192 x 9 FLAG LOGIC WRITE POINTER READ POINTER READ CONTROL LOGIC OUTPUT REGISTER RESET LOGIC RCLK REN1 REN2 RS OE Q0 - Q8 4092 drw 01 IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. SyncFIFO is a trademark of Integrated Device Technology, Inc. COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES 1 ©2002 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. FEBRUARY 2002 DSC-4092/2 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES PIN CONFIGURATION RS D2 D3 D4 D5 D6 D7 D8 D2 D3 D4 D5 D6 D7 INDEX INDEX 32 31 30 29 28 27 26 25 D1 D0 PAF PAE GND REN1 RCLK REN2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 24 23 22 21 20 19 18 17 WEN1 WCLK WEN2/LD VCC Q8 Q7 Q6 Q5 4 D1 D0 PAF PAE GND REN1 RCLK REN2 OE 5 6 7 8 9 10 11 12 13 3 2 1 32 31 30 29 28 27 26 25 24 23 22 21 RS WEN1 WCLK WEN2/LD VCC Q8 Q7 Q6 Q5 14 15 16 17 18 19 20 EF FF Q0 Q1 Q2 Q3 OE EF Q0 Q1 Q2 Q3 FF Q4 Q4 4092 drw02 D8 4092 drw02a TQFP (PR32-1, order code: PF) TOP VIEW PLCC (J32-1, order code: J) TOP VIEW PIN DESCRIPTIONS Symbol D0-D8 RS WCLK WEN1 WEN2/LD Q0-Q8 RCLK REN1 REN2 OE EF PAE PAF FF VCC GND I/O Description I Data inputs for a 9-bit bus. I When RS is set LOW, internal read and write pointers are set to the first location of the RAM array, FF and PAF go HIGH, and PAE and EF go LOW. A Reset is required before an initial Write after power-up. Write Clock I Data is written into the FIFO on a LOW-to-HIGH transition of WCLK when the Write Enable(s) are asserted. Write Enable 1 I If the FIFO is configured to have programmable flags, WEN1 is the only Write Enable pin. When WEN1 is LOW, data is written into the FIFO on every LOW-to-HIGH transition WCLK. If the FIFO is configured to have two write enables, WEN1 must be LOW and WEN2 must be HIGH to write data into the FIFO. Data will not be written into the FIFO if the FF is LOW. Write Enable 2/ I The FIFO is configured at Reset to have either two write enables or programmable flags. If WEN2/ LD Load is HIGH at Reset, this pin operates as a second write enable. If WEN2/LD is LOW at Reset, this pin operates as a control to load and read the programmable flag offsets. If the FIFO is configured to have two write enables, WEN1 must be LOW and WEN2 must be HIGH to write data into the FIFO. Data will not be written into the FIFO if the FF is LOW. If the FIFO is configured to have programmable flags, WEN2/LD is held LOW to write or read the programmable flag offsets. Data Outputs O Data outputs for a 9-bit bus. Read Clock I Data is read from the FIFO on a LOW-to-HIGH transition of RCLK when REN1 and REN2 are asserted. Read Enable 1 I When REN1 and REN2 are LOW, data is read from the FIFO on every LOW-to-HIGH transition of RCLK. Data will not be read from the FIFO if the EF is LOW. Read Enable 2 I When REN1 and REN2 are LOW, data is read from the FIFO on every LOW-to-HIGH transition of RCLK. Data will not be read from the FIFO if the EF is LOW. Output Enable I When OE is LOW, the data output bus is active. If OE is HIGH, the output data bus will be in a high-impedance state. Empty Flag O When EF is LOW, the FIFO is empty and further data reads from the output are inhibited. When EF is HIGH, the FIFO is not empty. EF is synchronized to RCLK. Programmable O When PAE is LOW, the FIFO is almost-empty based on the offset programmed into the FIFO. The default Almost-Empty Flag offset at reset is Empty+7. PAE is synchronized to RCLK. Programmable O When PAF is LOW, the FIFO is almost-full based on the offset programmed into the FIFO. The default Almost-Full Flag offset at reset is Full-7. PAF is synchronized to WCLK. Full Flag O When FF is LOW, the FIFO is full and further data writes into the input are inhibited. When FF is HIGH, the FIFO is not full. FF is synchronized to WCLK. Power One 3.3V volt power supply pin. Ground One 0 volt ground pin. 2 Name Data Inputs Reset IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES ABSOLUTE MAXIMUM RATINGS(1) Symbol VTERM(2) TSTG IOUT Rating Terminal Voltage with Respect to GND Storage Temperature DC Output Current Com'l & Ind'l –0.5 to +5 –55 to +125 –50 to +50 Unit V °C mA RECOMMENDED OPERATING CONDITIONS Symbol VCC GND VIH VIL TA TA Parameter Supply Voltage Commercial/Industrial Supply Voltage Input High Voltage Commercial/Industrial Input Low Voltage Commercial/Industrial Operating Temperature Commercial Operating Temperature Industrial Min. 3.0 0 2.0 -0.5 0 -40 Typ. 3.3 0 — — — — Max. 3.6 0 5.5 0.8 70 85 Unit V V V V °C °C 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 the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. VCC terminal only. DC ELECTRICAL CHARACTERISTICS (Commercial: VCC = 3.3V ± 0.3V, TA = 0°C to +70°C;Industrial: VCC = 3.3V ± 0.3V, TA = -40°C to +85°C) IDT72V201 IDT72V211 IDT72V221 IDT72V231 IDT72V241 IDT72V251 Commercial and Industrial(1) tCLK = 10, 15, 20 ns Typ. — — — — — — Symbol ILI (2) Parameter Input Leakage Current (Any Input) Output Leakage Current Output Logic “1” Voltage, IOH = –2mA Output Logic “0” Voltage, IOL = 8mA Active Power Supply Current Standby Current Min. –1 –10 2.4 — — — Max. 1 10 — 0.4 20 5 Unit µA µA V V mA mA ILO(3) VOH VOL ICC1(4,5,6) ICC2 (4,7) NOTES: 1. Industrial temperature range product for the 15ns speed grade is available as a standard device. All other speed grades are available by special order. 2. Measurements with 0.4 ≤ VIN ≤ VCC. 3. OE ≥ VIH, 0.4 ≤ VOUT ≤ VCC. 4. Tested with outputs disabled (IOUT = 0). 5. RCLK and WCLK toggle at 20 MHz and data inputs switch at 10 MHz. 6. Typical ICC1 = 0.17 + 0.48*fS + 0.02*CL*fS (in mA) with VCC = 3.3V, TA = 25°C, fS = WCLK frequency = RCLK frequency (in MHz, using TTL levels), data switching at fS/2, CL = capacitive load (in pF). 7. All Inputs = VCC - 0.2V or GND + 0.2V, except RCLK and WCLK, which toggle at 20 MHz. CAPACITANCE (TA = +25°C, f = 1.0MHz) Symbol CIN(2) COUT(1,2) Parameter Input Capacitance Output Capacitance Conditions VIN = 0V VOUT = 0V Max. 10 10 Unit pF pF NOTES: 1. With output deselected (OE ≥ VIH). 2. Characterized values, not currently tested. 3 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES AC ELECTRICAL CHARACTERISTICS(1) (Commercial: VCC = 3.3 ±0.3V, TA = 0°C to + 70°C;Industrial: VCC = 3.3 ±0.3V, TA = -40°C to + 85°C) Commercial IDT72V201L10 IDT72V211L10 IDT72V221L10 IDT72V231L10 IDT72V241L10 IDT72V251L10 Min. Max. — 100 2 10 4.5 4.5 3 0.5 3 0.5 10 8 8 — 0 3 3 — — — — 5 14 6.5 — — — — — — — — — — 10 — — — 6.5 6.5 6.5 6.5 — — Com'l & Ind'l(2) IDT72V201L15 IDT72V211L15 IDT72V221L15 IDT72V231L15 IDT72V241L15 IDT72V251L15 Min. Max. — 66.7 2 15 6 6 4 1 4 1 15 10 10 — 0 3 3 — — — — 6 18 10 — — — — — — — — — — 15 — 8 8 10 10 10 10 — — Commercial IDT72V201L20 IDT72V211L20 IDT72V221L20 IDT72V231L20 IDT72V241L20 IDT72V251L20 Min. Max. — 50 2 20 8 8 5 1 5 1 20 12 12 — 0 3 3 — — — — 8 20 12 — — — — — — — — — — 20 — 10 10 12 12 12 12 — — Symbol fS tA tCLK tCLKH tCLKL tDS tDH tENS tENH tRS tRSS tRSR tRSF tOLZ tOE tOHZ tWFF tREF tAF tAE tSKEW1 tSKEW2 Parameter Clock Cycle Frequency Data Access Time Clock Cycle Time Clock High Time Clock Low Time Data Setup Time Data Hold Time Enable Setup Time Enable Hold Time Reset Pulse Width(1) Reset Setup Time Reset Recovery Time Reset to Flag and Output Time Output Enable to Output in Low-Z(3) Output Enable to Output Valid Output Enable to Output in High-Z(3) Write Clock to Full Flag Read Clock to Empty Flag Write Clock to Almost-Full Flag Read Clock to Almost-Empty Flag Skew time between Read Clock & Write Clock for Empty Flag &Full Flag Skew time between Read Clock & Write Clock for Almost-Empty Flag & Almost-Full Flag Unit MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns NOTES: 1. Pulse widths less than minimum values are not allowed. 2. Industrial temperature range is available by special order for speed grades faster than 15ns. 3. Values guaranteed by design, not currently tested. 3.3V 330Ω D.U.T. AC TEST CONDITIONS In Pulse Levels Input Rise/Fall Times Input Timing Reference Levels Output Reference Levels Output Load GND to 3.0V 3ns 1.5V 1.5V See Figure 1 510Ω 30pF* 4092 drw03 or equivalent circuit Figure 1. Output Load *Includes jig and scope capacitances. 4 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES SIGNAL DESCRIPTIONS INPUTS: DATA IN (D0 - D8) Data inputs for 9-bit wide data. OUTPUT ENABLE (OE) When Output Enable (OE) is enabled (LOW), the parallel output buffers receive data from the output register. When Output Enable (OE) is disabled (HIGH), the Q output data bus is in a high-impedance state. WRITE ENABLE 2/LOAD (WEN2/LD) This is a dual-purpose pin. The FIFO is configured at Reset to have programmable flags or to have two write enables, which allows depth expansion. If Write Enable 2/Load (WEN2/LD) is set high at Reset (RS = LOW), this pin operates as a second Write Enable pin. If the FIFO is configured to have two write enables, when Write Enable (WEN1) is LOW and Write Enable 2/Load (WEN2/LD) is HIGH, data can be loaded into the input register and RAM array on the LOW-to-HIGH transition of every Write Clock (WCLK). Data is stored in the RAM array sequentially and independently of any on-going read operation. In this configuration, when Write Enable (WEN1) is HIGH and/or Write Enable 2/Load (WEN2/LD) is LOW, the input register holds the previous data and no new data is allowed to be loaded into the register. To prevent data overflow, the Full Flag (FF) will go LOW, inhibiting further write operations. Upon the completion of a valid read cycle, the Full Flag (FF) will go HIGH after tWFF, allowing a valid write to begin. Write Enable 1 (WEN1) and Write Enable 2/Load (WEN2/LD) are ignored when the FIFO is full. The FIFO is configured to have programmable flags when the Write Enable 2/Load (WEN2/LD) is set LOW at Reset (RS = LOW). The IDT72V201/72V211/ 72V221/72V231/72V241/72V251 devices contain four 8-bit offset registers which can be loaded with data on the inputs, or read on the outputs. See Figure 3 for details of the size of the registers and the default values. If the FIFO is configured to have programmable flags when the Write Enable 1 (WEN1) and Write Enable 2/Load (WEN2/LD) are set low, data on the inputs D is written into the Empty (Least Significant Bit) Offset register on the first LOWto-HIGH transition of the Write Clock (WCLK). Data is written into the Empty (Most Significant Bit) Offset register on the second LOW-to-HIGH transition of the Write Clock (WCLK), into the Full (Least Significant Bit) Offset register on the third transition, and into the Full (Most Significant Bit) Offset register on the fourth transition. The fifth transition of the Write Clock (WCLK) again writes to the Empty (Least Significant Bit) Offset register. However, writing all offset registers does not have to occur at one time. One or two offset registers can be written and then by bringing the Write Enable 2/ Load (WEN2/LD) pin HIGH, the FIFO is returned to normal read/write operation. When the Write Enable 2/Load (WEN2/LD) pin is set LOW, and Write Enable 1 (WEN1) is LOW, the next offset register in sequence is written. The contents of the offset registers can be read on the output lines when the Write Enable 2/Load (WEN2/LD) pin is set low and both Read Enables (REN1, REN2) are set LOW. Data can be read on the LOW-to-HIGH transition of the Read Clock (RCLK). A read and write should not be performed simultaneously to the offset registers. LD 0 WEN1 0 WCLK Selection Empty Offset (LSB) Empty Offset (MSB) Full Offset (LSB) Full Offset (MSB) No Operation Write Into FIFO No Operation CONTROLS: RESET (RS) Reset is accomplished whenever the Reset (RS) input is taken to a LOW state. During reset, both internal read and write pointers are set to the first location. A reset is required after power-up before a write operation can take place. The Full Flag (FF) and Programmable Almost-Full Flag (PAF) will be reset to HIGH after tRSF. The Empty Flag (EF) and Programmable Almost-Empty Flag (PAE) will be reset to LOW after tRSF. During reset, the output register is initialized to all zeros and the offset registers are initialized to their default values. WRITE CLOCK (WCLK) A write cycle is initiated on the LOW-to-HIGH transition of the Write Clock (WCLK). Data setup and hold times must be met in respect to the LOW-to-HIGH transition of the Write Clock (WCLK). The Full Flag (FF) and Programmable Almost-Full Flag (PAF) are synchronized with respect to the LOW-to-HIGH transition of the Write Clock (WCLK). The Write and Read clocks can be asynchronous or coincident. WRITE ENABLE 1 (WEN1) If the FIFO is configured for programmable flags, Write Enable 1 (WEN1) is the only enable control pin. In this configuration, when Write Enable 1 (WEN1) is low, data can be loaded into the input register and RAM array on the LOWto-HIGH transition of every Write Clock (WCLK). Data is stored in the RAM array sequentially and independently of any on-going read operation. In this configuration, when Write Enable 1 (WEN1) is HIGH, the input register holds the previous data and no new data is allowed to be loaded into the register. If the FIFO is configured to have two write enables, which allows for depth expansion, there are two enable control pins. See Write Enable 2 paragraph below for operation in this configuration. To prevent data overflow, the Full Flag (FF) will go LOW, inhibiting further write operations. Upon the completion of a valid read cycle, the Full Flag (FF) will go HIGH after tWFF, allowing a valid write to begin. Write Enable 1 (WEN1) is ignored when the FIFO is full. READ CLOCK (RCLK) Data can be read on the outputs on the LOW-to-HIGH transition of the Read Clock (RCLK). The Empty Flag (EF) and Programmable Almost-Empty Flag (PAE) are synchronized with respect to the LOW-to-HIGH transition of the Read Clock (RCLK). The Write and Read clocks can be asynchronous or coincident. READ ENABLES (REN1, REN2) When both Read Enables (REN1, REN2) are LOW, data is read from the RAM array to the output register on the LOW-to-HIGH transition of the Read Clock (RCLK). When either Read Enable (REN1, REN2) is HIGH, the output register holds the previous data and no new data is allowed to be loaded into the register. When all the data has been read from the FIFO, the Empty Flag (EF) will go LOW, inhibiting further read operations. Once a valid write operation has been accomplished, the Empty Flag (EF) will go HIGH after tREF and a valid read can begin. The Read Enables (REN1, REN2) are ignored when the FIFO is empty. 5 0 1 1 1 0 1 NOTES: 1. For the purposes of this table, WEN2 = VIH. 2. The same selection sequence applies to reading from the registers. REN1 and REN2 are enabled and read is performed on the LOW-to-HIGH transition of RCLK. Figure 2. Write Offset Register IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 IDT72V201 - 256 x 9-BIT 8 7 Empty Offset (LSB) Reg. Default Value 007H 8 0 8 0 8 7 Empty Offset (LSB) Default Value 007H 1 (MSB) 0 8 7 Full Offset (LSB) Reg. Default Value 007H 8 0 8 0 8 7 Full Offset (LSB) Default Value 007H 1 (MSB) 0 0 8 0 8 7 0 8 IDT72V211 - 512 x 9-BIT 0 8 7 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT72V221 - 1,024 x 9-BIT 0 Empty Offset (LSB) Reg. Default Value 007H 1 (MSB) 00 0 Full Offset (LSB) Reg. Default Value 007H 1 (MSB) 00 0 0 IDT72V231 - 2,049 x 9-BIT 8 7 Empty Offset (LSB) Reg. Default Value 007H 8 2 (MSB) 000 8 7 Full Offset (LSB) Reg. Default Value 007H 8 2 (MSB) 000 0 8 0 8 7 0 8 0 8 7 IDT72V241 - 4,096 x 9-BIT 0 Empty Offset (LSB) Default Value 007H 3 (MSB) 0000 0 Full Offset (LSB) Default Value 007H 3 (MSB) 0000 0 8 8 7 0 8 8 7 IDT72V251 - 8,192 x 9-BIT 0 Empty Offset (LSB) Default Value 007H 4 (MSB) 00000 0 Full Offset (LSB) Default Value 007H 4 (MSB) 00000 4092 drw 05 0 0 Figure 3. Offset Register Location and Default Values 6 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES FULL FLAG (FF) The Full Flag (FF) will go LOW, inhibiting further write operation, when the device is full. If no reads are performed after Reset (RS), the Full Flag (FF) will go LOW after 256 writes for the IDT72V201, 512 writes for the IDT72V211, 1,024 writes for the IDT72V221, 2,048 writes for the IDT72V231, 4,096 writes for the IDT72V241 and 8,192 writes for the IDT72V251. The Full Flag (FF) is synchronized with respect to the LOW-to-HIGH transition of the Write Clock (WCLK). EMPTY FLAG (EF) The Empty Flag (EF) will go LOW, inhibiting further read operations, when the read pointer is equal to the write pointer, indicating the device is empty. The Empty Flag (EF) is synchronized with respect to the LOW-to-HIGH transition of the Read Clock (RCLK). PROGRAMMABLE ALMOST-FULL FLAG (PAF) The Programmable Almost-Full flag (PAF) will go LOW when the FIFO reaches the almost-full condition. If no reads are performed after Reset (RS), the Programmable Almost-Full flag (PAF) will go LOW after (256-m) writes for the IDT72V201, (512-m) writes for the IDT72V211, (1,024-m) writes for the OUTPUTS: IDT72V221, (2,048-m) writes for the IDT72V231, (4,096-m) writes for the IDT72V241 and (8,192-m) writes for the IDT72V251. The offset “m” is defined in the Full Offset registers. If there is no full offset specified, the Programmable Almost-Full flag (PAF) will go LOW at Full-7 words. The Programmable Almost-Full flag (PAF) is synchronized with respect to the LOW-to-HIGH transition of the Write Clock (WCLK). PROGRAMMABLE ALMOST-EMPTY FLAG (PAE) The Programmable Almost-Empty flag (PAE) will go LOW when the read pointer is "n+1" locations less than the write pointer. The offset "n" is defined in the Empty Offset registers. If no reads are performed after Reset the Programmable Almost-Empty flag (PAE) will go HIGH after "n+1" for the IDT72V201/72V211/72V221/72V231/72V241/72V251. If there is no empty offset specified, the Programmable Almost-Empty flag (PAE) will go LOW at Empty+7 words. The Programmable Almost-Empty flag (PAE) is synchronized with respect to the LOW-to-HIGH transition of the Read Clock (RCLK). DATA OUTPUTS (Q0 - Q8) Data outputs for a 9-bit wide data. TABLE 1 — STATUS FLAGS NUMBER OF WORDS IN FIFO IDT72V201 0 1 to n(1) (n+1) to (256-(m+1)) (256-m)(2) to 255 256 IDT72V211 0 1 to n(1) (n+1) to (512-(m+1)) (512-m)(2) to 511 512 IDT72V221 0 1 to n(1) (n+1) to (1,024-(m+1)) (1,024-m)(2) to 1,023 1,024 FF H H H H L PAF H H H L L PAE L L H H H EF L H H H H NUMBER OF WORDS IN FIFO IDT72V231 0 1 to n (1) IDT72V241 0 1 to n (1) IDT72V251 0 1 to n (1) FF H H H H L PAF H H H L L PAE L L H H H EF L H H H H (n+1) to (2,048-(m+1)) (2,048-m)(2) to 2,047 2,048 NOTES: 1. n = Empty Offset (n = 7 default value) 2. m = Full Offset (m = 7 default value) (n+1) to (4,096-(m+1)) (4,096-m)(2) to 4,095 4,096 (n+1) to (8,192-(m+1)) (8,192-m)(2) to 8,191 8,192 7 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 tRS RS tRSS REN1, REN2 tRSS WEN1 tRSS WEN2/LD (1) tRSF EF, PAE tRSF FF, PAF tRSF Q0 - Q8 tRSR tRSR tRSR COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES OE = 1 (2) OE = 0 4092 drw06 NOTES: 1. Holding WEN2/LD HIGH during reset will make the pin act as a second write enable pin. Holding WEN2/LD LOW during reset will make the pin act as a load enable for the programmable flag offset registers. 2. After reset, the outputs will be LOW if OE = 0 and high-impedance if OE = 1. 3. The clocks (RCLK, WCLK) can be free-running during reset. Figure 4. Reset Timing tCLK tCLKH WCLK tDS D0 - D8 DATA IN VALID tENS WEN1 tENS WEN2/ (If Applicable) tWFF FF tSKEW1(1) RCLK tWFF tENH NO OPERATION NO OPERATION tENH tDH tCLKL REN1, REN2 NOTE: 1. tSKEW1 is the minimum time between a rising RCLK edge and a rising WCLK edge for FF to change during the current clock cycle. If the time between the rising edge of RCLK and the rising edge of WCLK is less than tSKEW1, then FF may not change state until the next WCLK edge. 4092 drw07 Figure 5. Write Cycle Timing 8 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 tCLK tCLKH RCLK tENS REN1, REN2 tREF EF tA Q0 - Q8 tOLZ tOE OE VALID DATA tOHZ tSKEW1 (1) tENH NO OPERATION tREF tCLKL COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES WCLK WEN1 WEN2 NOTE: 1. tSKEW1 is the minimum time between a rising WCLK edge and a rising RCLK edge for EF to change during the current clock cycle. If the time between the rising edge of RCLK and the rising edge of WCLK is less than tSKEW1, then EF may not change state until the next RCLK edge. 4092 drw08 Figure 6. Read Cycle Timing WCLK tDS D0 - D8 tENS WEN1 tENS WEN2 (If Applicable) tSKEW1 RCLK tREF EF REN1, REN2 tENS (1) D1 D0 (First Valid Write) D2 D3 tFRL tA Q0 - Q8 tOLZ NOTE: 1. When tSKEW1 ≥ minimum specification, tFRL = tCLK + tSKEW1 When tSKEW1 < minimum specification, tFRL = 2tCLK + tSKEW1 or tCLK + tSKEW1 The Latency Timings apply only at the Empty Boundary (EF = LOW). tA D0 D1 tOE 4092 drw09 OE Figure 7. First Data Word Latency Timing 9 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 NO WRITE WCLK tSKEW1 D0 - D8 tWFF FF tENS WEN1 tENS WEN2 (If Applicable) tENH tENH tWFF tDS NO WRITE COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES NO WRITE tSKEW1 tWFF tENS (1) tENS (1) RCLK REN1, REN2 OE LOW Q0 - Q8 tENS tENH tENS tA tA DATA IN OUTPUT REGISTER DATA READ NEXT DATA READ 4092 drw10 tENH NOTE: 1. Only one of the two Write Enable inputs, WEN1 or WEN2, needs to go inactive to inhibit writes to the FIFO. Figure 8. Full Flag Timing WCLK tDS D0 - D8 tENS WEN1 tENS WEN2 (If Applicable) tSKEW1 RCLK tREF EF REN1, REN2 OE LOW tA Q0 - Q8 DATA IN OUTPUT REGISTER DATA READ 4092 drw11 tDS DATA WRITE 1 tENH tENS DATA WRITE 2 tENH tENH tENS tENH tFRL (1) tSKEW1 tFFL (1) tREF tREF NOTE: 1. When tSKEW1 ≥ minimum specification, tFRL maximum = tCLK + tSKEW1 When tSKEW1 < minimum specification, tFRL maximum = 2tCLK + tSKEW1 or tCLK + tSKEW1 The Latency Timings apply only at the Empty Boundary (EF = LOW). Figure 9. Empty Flag Timing 10 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 tCLKH WCLK tENS WEN1 tENS WEN2 (If Applicable) tPAF PAF Full - (m + 1) words in FIFO (1) COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES tCLKL (4) tENH tENH Full - m words in FIFO tSKEW2 (2) (3) tPAF RCLK tENS REN1, REN2 tENH 4092 drw12 NOTES: 1. m = PAF offset. 2. 256 - m words in FIFO for IDT72V201, 512 - m words for IDT72V211, 1,024 - m words for IDT72V221, 2,048 - m words for IDT72V231, 4,096 - m words for IDT72V241, 8,192 - m words for IDT72V251. 3. tSKEW2 is the minimum time between a rising RCLK edge and a rising WCLK edge for PAF to change during that clock cycle. If the time between the rising edge of RCLK and the rising edge of WCLK is less than tSKEW2, then PAF may not change state until the next WCLK rising edge. 4. If a write is performed on this rising edge of the write clock, there will be Full - (m-1) words in the FIFO when PAF goes LOW. Figure 10. Programmable Full Flag Timing tCLKH WCLK tCLKL tENS WEN1 tENS WEN2 (If Applicable) tENH tENH PAE n words in FIFO (1) tSKEW2 (2) tPAE n + 1 words in FIFO tPAE (3) RCLK tENS REN1, REN2 tENH 4092 drw13 NOTES: 1. n = PAE offset. 2. tSKEW2 is the minimum time between a rising WCLK edge and a rising RCLK edge for PAE to change during that clock cycle. If the time between the rising edge of WCLK and the rising edge of RCLK is less than tSKEW2, then PAE may not change state until the next RCLK rising edge. 3. If a read is performed on this rising edge of the read clock, there will be Empty + (n-1) words in the FIFO when PAE goes LOW. Figure 11. Programmable Empty Flag Timing 11 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES tCLK tCLKH WCLK tENS tENH tCLKL LD tENS WEN1 tDS tDH D0 - D7 PAE OFFSET (LSB) PAE OFFSET (MSB) PAF OFFSET (LSB) PAF OFFSET (MSB) 4092 drw14 Figure 12. Write Offset Registers Timing tCLK tCLKH RCLK tENS LD tENS REN1, REN2 tA Q0 - Q7 DATA IN OUTPUT REGISTER EMPTY OFFSET (LSB) EMPTY OFFSET (MSB) FULL OFFSET (LSB) FULL OFFSET (MSB) 4092 drw15 tCLKL tENH Figure 13. Read Offset Registers Timing 12 IDT72V201/72V211/72V221/72V231/72V241/72V251 3.3V CMOS SyncFIFO™ 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES OPERATING CONFIGURATIONS SINGLE DEVICE CONFIGURATION A single IDT72V201/72V211/72V221/72V231/72V241/72V251 may be used when the application requirements are for 256/512/1,024/2,048/4,096/ 8,192 words or less. When these FIFOs are in a Single Device Configuration, the Read Enable 2 (REN2) control input can be grounded (see Figure 14). In this configuration, the Write Enable 2/Load (WEN2/LD) pin is set LOW at Reset so that the pin operates as a control to load and read the programmable flag offsets. RESET (RS) WRITE CLOCK (WCLK) WRITE ENABLE 1 (WEN1) WRITE ENABLE 2/LOAD (WEN2/LD) DATA IN (D0 - D8) FULL FLAG (FF) PROGRAMMABLE ALMOST-FULL (PAF) IDT 72V201 72V211 72V221 72V231 72V241 72V251 READ CLOCK (RCLK) READ ENABLE 1 (REN1) OUTPUT ENABLE (OE) DATA OUT (Q0 - Q8) EMPTY FLAG (EF) PROGRAMMABLE ALMOST-EMPTY ( PAE) 4092 drw16 READ ENABLE 2 (REN2) Figure 14. Block Diagram of Single 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 Synchronous FIFO WIDTH EXPANSION CONFIGURATION Word width may be increased simply by connecting the corresponding input controls signals of multiple devices. A composite flag should be created for each of the end-point status flags (EF and FF). The partial status flags (AE and AF) can be detected from any one device. Figure 15 demonstrates a 18-bit word width by using two IDT72V201/72V211/72V221/72V231/72V241/72V251s. Any word width can be attained by adding additional IDT72V201/72V211/ 72V221/72V231/72V241/72V251s. When these devices are in a Width Expansion Configuration, the Read Enable 2 (REN2) control input can be grounded (see Figure 15). In this configuration, the Write Enable 2/Load (WEN2/LD) pin is set LOW at Reset so that the pin operates as a control to load and read the programmable flag offsets. DEPTH EXPANSION The IDT72V201/72V211/72V221/72V231/72V241/72V251 can be adapted to applications when the requirements are for greater than 256/512/ 1,024/2,048/4,096/8,192 words. The existence of two enable pins on the read and write port allow depth expansion. The Write Enable 2/Load pin is used as a second write enable in a depth expansion configuration thus the programmable flags are set to the default values. Depth expansion is possible by using one enable input for system control while the other enable input is controlled by expansion logic to direct the flow of data. A typical application would have the expansion logic alternate data access from one device to the next in a sequential manner. These FIFOs operate in the Depth Expansion configuration when the following conditions are met: 1. The WEN2/ LD pin is held HIGH during Reset so that this pin operates a second Write Enable. 2. External logic is used to control the flow of data. Please see the Application Note" DEPTH EXPANSION OF IDT'S SYNCHRONOUS FIFOs USING THE RING COUNTER APPROACH" for details of this configuration. RESET (RS) DATA IN (D) 18 9 9 RESET (RS) READ CLOCK (RCLK) WRITE CLOCK (WCLK) WRITE ENABLE1 (WEN1) WRITE ENABLE2/LOAD (WEN2/LD) FULL FLAG (FF) #1 FULL FLAG (FF) #2 PROGRAMMABLE (PAF) IDT 72V201 72V211 72V221 72V231 72V241 72V251 IDT 72V201 72V211 72V221 72V231 72V241 72V251 READ ENABLE (REN) OUTPUT ENABLE (OE) PROGRAMMABLE (PAE) EMPTY FLAG (EF) #1 EMPTY FLAG (EF) #2 9 DATA OUT (Q) 18 9 READ ENABLE 2 (REN2) READ ENABLE 2 (REN2) 4092 drw17 Figure 15. Block Diagram of 256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18, 4,096 x 18 and 8,192 x 18 Synchronous FIFO Used in a Width Expansion Configuration 13 ORDERING INFORMATION IDT XXXXX Device Type X Power XX Speed X Package X Process/ Temperature Range BLANK I(1) J PF 10 15 20 L 72V201 72V211 72V221 72V231 72V241 72V251 Commercial (0°C to +70°C) Industrial (-40°C to +85°C) Plastic Leaded Chip Carrier (PLCC, J32-1) Plastic Thin Quad Flatpack (TQFP, PR32-1) Commercial Only Commercial & Industrial Clock Cycle Time (tCLK) Speed in Nanoseconds Commercial Only Low Power 256 x 9 512 x 9 1,024 x 9 2,048 x 9 4,096 x 9 8,192 x 9       3.3V SyncFIFO™ 3.3V SyncFIFO™ 3.3V SyncFIFO™ 3.3V SyncFIFO™ 3.3V SyncFIFO™ 3.3V SyncFIFO™ 4092 drw 18 NOTE: 1. Industrial temperature range product for the 15ns is available as a standard device. All other speed grades are available by special order. DATASHEET DOCUMENT HISTORY 01/11/2002 02/01/2002 pg. 3. pg. 3. CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com 14 for Tech Support: 408-330-1753 email: FIFOhelp@idt.com