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3.3 VOLT DUAL CMOS SyncFIFOTM DUAL 256 X 9, DUAL 512 X 9, DUAL 1,024 X 9, DUAL 2,048 X 9, DUAL 4,096 X 9 , DUAL 8,192 X 9
IDT72V801 IDT72V811 IDT72V821 IDT72V831 IDT72V841 IDT72V851
.EATURES:
* * * * * * * * * * * * * * *
The IDT72V801 is equivalent to two IDT72V201 256 x 9 FIFOs The IDT72V811 is equivalent to two IDT72V211 512 x 9 FIFOs The IDT72V821 is equivalent to two IDT72V221 1,024 x 9 FIFOs The IDT72V831 is equivalent to two IDT72V231 2,048 x 9 FIFOs The IDT72V841 is equivalent to two IDT72V241 4,096 x 9 FIFOs The IDT72V851 is equivalent to two IDT72V251 8,192 x 9 FIFOs Offers optimal combination of large capacity, high speed, design flexibility and small footprint Ideal for prioritization, bidirectional, and width expansion applications 10 ns read/write cycle time 5V input tolerant Separate control lines and data lines for each FIFO Separate Empty, Full, programmable Almost-Empty and Almost-Full flags for each FIFO Enable puts output data lines in high-impedance state Space-saving 64-pin plastic Thin Quad Flat Pack (TQFP/ STQFP) Industrial temperature range (-40C to +85C) is available
DESCRIPTION:
The IDT72V801/72V811/72V821/72V831/72V841/72V851/72V851 are dual synchronous (clocked) FIFOs. The device is functionally equivalent to two IDT72V201/72V211/72V221/72V231/72V241/72V251 FIFOs in a single package with all associated control, data, and flag lines assigned to separate pins.
Each of the two FIFOs (designated FIFO A and FIFO B) contained in the IDT72V801/72V811/72V821/72V831/72V841/72V851 has a 9-bit input data port (DA0 - DA8, DB0 - DB8) and a 9-bit output data port (QA0 - QA8, QB0 - QB8). Each input port is controlled by a free-running clock (WCLKA, WCLKB), and two Write Enable pins (WENA1, WENA2, WENB1, WENB2). Data is written into each of the two arrays on every rising clock edge of the Write Clock (WCLKA, WCLKB) when the appropriate Write Enable pins are asserted. The output port of each FIFO bank is controlled by its associated clock pin (RCLKA, RCLKB) and two Read Enable pins (RENA1, RENA2, RENB1, RENB2). 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 dual clock operation. An Output Enable pin (OEA, OEB) is provided on the read port of each FIFO for three-state output control. Each of the two FIFOs has two fixed flags, Empty (EFA, EFB) and Full (FFA, FFB). Two programmable flags, Almost-Empty (PAEA, PAEB) and Almost-Full (PAFA, PAFB), are provided for each FIFO bank to improve memory utilization. If not programmed, the programmable flags default to Empty+7 for PAEA and PAEB, and Full-7 for PAFA and PAFB. The IDT72V801/72V811/72V821/72V831/72V841/72V851 architecture lends itself to many flexible configurations such as: * 2-level priority data buffering * Bidirectional operation * Width expansion * Depth expansion This FIFO is fabricated using IDT's high-performance submicron CMOS technology.
.UNCTIONAL BLOCK DIAGRAM
WCLKA WENA1 WENA2 WCLKB EFA PAEA WENB1 PAFA WENB2 FFA
DA0 - DA8
LDA
DB0 - DB8
LDB
INPUT REGISTER 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
OFFSET REGISTER FLAG LOGIC WRITE CONTROL LOGIC
INPUT REGISTER
OFFSET REGISTER FLAG LOGIC EFB PAEB PAFB FFB
WRITE POINTER
READ POINTER READ CONTROL LOGIC
WRITE POINTER
RAM ARRAY 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9, 8,192 x 9
READ POINTER READ CONTROL LOGIC
OUTPUT REGISTER RESET LOGIC RESET LOGIC
OUTPUT REGISTER
RSA
OEA
QA0 - QA8
RCLKA RENA1 RENA2
RSB
OEB
QB0 - QB8
RCLKB RENB1 RENB2
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The IDT logo is a registered trademark and the SyncFIFO is a trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
1
2001 Integrated Device Technology, Inc.
APRIL 2001
DSC-4093/1
IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
PIN CON.IGURATION
QA0 FFA EFA OEA RENA2 RCLKA RENA1 GND QB8 QB7 QB6 QB5 QB4 QB3 QB2 QB1
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
DA5 DA4 DA3 DA2 DA1 DA0 PAFA PAEA WENB2/LDB WCLKB WENB1 RSB DB8 DB7 DB6 DB5
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
QA1 QA2 QA3 QA4 QA5 QA6 QA7 QA8 VCC WENA2/LDA WCLKA WENA1 RSA DA8 DA7 DA6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
QB0 FFB EFB OEB RENB2 RCLKB RENB1 GND Vcc PAEB PAFB DB0 DB1 DB2 DB3 DB4
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TQFP (PN64-1, order code: PF) STQFP (PP64-1, order code: TF) TOP VIEW
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IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
PIN DESCRIPTIONS
The IDT72V801/72V811/72V821/72V831/72V841/72V851's two FIFOs, referred to as FIFO A and FIFO B, are identical in every respect. The following Symbol
DA0-DA8 DB0-DB8 RSA, RSB
description defines the input and output signals for FIFO A. The corresponding signal names for FIFO B are provided in parentheses.
Name
I/O
I I I
Description
9-bit data inputs to RAM array A. 9-bit data inputs to RAM array B. When RSA (RSB) is set LOW, the associated internal read and write pointers of array A (B) are set to the first location; FFA (FFB) and PAFA (PAFB) go HIGH, and PAEA (PAEB) and EFA (EFB) go LOW. After powerup, a reset of both FIFOs A and B is required before an initial WRITE. Data is written into the FIFO A (B) on a LOW-to-HIGH transition of WCLKA (WCLKB) when the write enable(s) are asserted. If FIFO A (B) is configured to have programmable flags, WENA1 (WENB1) is the only write enable pin that can be used. When WENA1 (WENB1) is LOW, data A (B) is written into the FIFO on every LOW-to-HIGH transition WCLKA (WCLKB). If the FIFO is configured to have two write enables, WENA1 (WENB1) must be LOW and WENA2 (WENB2) must be HIGH to write data into the FIFO. Data will not be written into the FIFO if FFA (FFB) is LOW. FIFO A (B) is configured at reset to have either two write enables or programmable flags. If LDA (LDB) is HIGH at reset, this pin operates as a second Write Enable. If WENA2/LDA (WENB2/LDB) is LOW at reset this pin operates as a control to load and read the programmable flag offsets for its respective array. If the FIFO is configured to have two write enables, WENA1 (WENB1) must be LOW and WENA2 (WENB2) must be HIGH to write data into FIFO A (B). Data will not be written into FIFO A (B) if FFA (FFB) is LOW. If the FIFO is configured to have programmable flags, LDA (LDB) is held LOW to write or read the programmable flag offsets.
A Data Inputs B Data Inputs Reset
WCLKA WCLKB WENA1 WENB1
Write Clock Write Enable 1
I I
WENA2/LDA WENB2/LDB
Write Enable 2/ Load
I
QA0-QA8 QB0-QB8 RCLKA RCLKB RENA1 RENB1 RENA2 RENB2 OEA EFA EFB PAEA PAEB PAFA PAFB FFA FFB VCC GND
A Data Outputs B Data Outputs Read Clock Read Enable 1 Read Enable 2 Output Enable Empty Flag Programmable Almost-Empty Flag Programmable Almost-Full Flag Full Flag Power Ground
O 9-bit data outputs from RAM array A. O 9-bit data outputs from RAM array B. I I I I Data is read from FIFO A (B) on a LOW-to-HIGH transition of RCLKA (RCLKB) when RENA1(RENB1) and RENA2 (RENB2) are asserted. When RENA1 (RENB1) and RENA2 (RENB2) are LOW, data is read from FIFO A (B) on every LOW-to-HIGH transition of RCLKA (RCLKB). Data will not be read from Array A (B) if EFA (EFB) is LOW. When RENA1 (RENB1) and RENA2 (RENB2) are LOW, data is read from the FIFO A (B) on every LOW-toHIGH transition of RCLKA (RCLKB). Data will not be read from array A (B) if the EFA (EFB) is LOW. When OEA (OEB) is LOW, outputs DA0-DA8 (DB0-DB8) are active. If OEA (OEB) is HIGH, the OEB outputs DA0DA8 (DB0-DB8) will be in a high-impedance state.
O When EFA (EFB) is LOW, FIFO A (B) is empty and further data reads from the output are inhibited. When EFA (EFB) is HIGH, FIFO A (B) is not empty. EFA (EFB) is synchronized to RCLKA (RCLKB). O When PAEA (PAEB) is LOW, FIFO A (B) is Almost-Empty based on the offset programmed into the appropriate offset register. The default offset at reset is Empty+7. PAEA (PAEB) is synchronized to RCLKA (RCLKB). O When PAFA (PAFB) is LOW, FIFO A (B) is Almost-Full based on the offset programmed into the appropriate offset register. The default offset at reset is Full-7. PAFA (PAFB) is synchronized to WCLKA (WCLKB). O When FFA (FFB) is LOW, FIFO A (B) is full and further data writes into the input are inhibited. When FFA (FFB) is HIGH, FIFO A (B) is not full. FFA (FFB) is synchronized to WCLKA (WCLKB). +3.3V power supply pin. 0V ground pin.
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IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS
Symbol VTERM TSTG IOUT Rating Terminal Voltage with Respect to GND Storage Temperature DC Output Current Commercial -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(Com'l & Ind'l) Supply Voltage(Com'l & Ind'l) Input High Voltage (Com'l & Ind'l) Input Low Voltage (Com'l & Ind'l) Operating Temperature Commercial Operating Temperature Industrial
Min
3.0 0 2.0 -- 0 -40
Typ.
3.3 0 -- -- --
Max
3.6 -- 5.0 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.
DC ELECTRICAL CHARACTERISTICS
(Commercial: VCC = 3.3V 0.3V, TA = 0C to +70C; Industrial :VCC = 3.3V 0.3V, TA = -40C to +85C)
IDT72V801 IDT72V811 IDT72V821 IDT72V831 IDT72V841 IDT72V851 Commercial and Industrial (1) tCLK = 10, 15, 20 ns Typ. -- -- -- -- -- --
Symbol ILI
(2) (3)
Parameter Input Leakage Current (Any Input) Output Leakage Current Output Logic "1" Voltage, IOH = -2 mA Output Logic "0" Voltage, IOL = 8 mA Active Power Supply Current (both FIFOs) Standby Current
Min. -1 -10 2.4 -- -- --
Max. -1 10 -- 0.4 40 10
Unit A A V V mA mA
ILO
VOH VOL ICC1(4,5,6) ICC2
(3,7)
NOTES: 1. Industrial temperature range product for the 15ns speed grade is available as a standard device. 2. Measurements with 0.4 VIN VCC. 3. OEA, OEB 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 = 2[0.17 + 0.48*fS + 0.02*CL*fS] (in mA). These equations are valid under the following conditions: VCC = 3.3V, TA = 25C, 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 = +25C, f = 1.0MHz)
Symbol CIN
(2) (1,2)
Parameter Input Capacitance Output Capacitance
Conditions VIN = 0V VOUT = 0V
Max. 10 10
Unit pF pF
COUT
NOTE: 1. With output deselected (OEA, OEB VIH). 2. Characterized values, not currently tested.
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IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
AC ELECTRICAL CHARACTERISTICS(1)
(Commercial: VCC = 3.3V 0.3V, TA = 0C to +70C; Industrial: VCC = 3.3V 0.3V, TA = -40C to +85C)
Commercial IDT72V801L10 IDT72V811L10 IDT72V821L10 IDT72V831L10 IDT72V841L10 IDT72V851L10 Symbol fS tA tCLK tCLKH tCLKL tDS tDH tENS tENH tRS tRSS tRSR tRSF tOLZ tOE tOHZ tWFF tREF tPAF tPAE tSKEW1 tSKEW2 Clock Cycle Frequency Data Access Time Clock Cycle Time Clock High Time Clock Low Time Data Set-up Time Data Hold Time Enable Set-up Time Enable Hold Time Reset Pulse Width(2) Reset Set-up Time Reset Recovery Time Reset to Flag Time 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 Programmable Almost-Full Flag Read Clock to Programmable Almost-Empty Flag Skew Time Between Read Clock and Write Clock for Empty Flag and Full Flag Skew Time Between Read Clock and Write Clock for Programmable Almost-Empty Flag and Programmable Almost-Full Flag Parameter Min. -- 2 10 4.5 4.5 3 0.5 3 0.5 10 8 8 -- 0 3 3 -- -- -- -- 5 14 Max. 100 6.5 -- -- -- -- -- -- -- -- -- -- 10 -- 6 6 6.5 6.5 6.5 6.5 -- -- Com'l & Ind'l IDT72V801L15 IDT72V811L15 IDT72V821L15 IDT72V831L15 IDT72V841L15 IDT72V851L15 Min. -- 2 15(1) 6 6 4 1 4 1 15 10 10 -- 0 3 3 -- -- -- -- 6 18 Max. 66.7 10 -- -- -- -- -- -- -- -- -- -- 15 -- 8 8 10 10 10 10 -- -- Commercial IDT72V801L20 IDT72V811L20 IDT72V821L20 IDT72V831L20 IDT72V841L20 IDT72V851L20 Min. -- 2 20 8 8 5 1 5 1 20 12 12 -- 0 3 3 -- -- -- -- 8 20 Max. 50 12 -- -- -- -- -- -- -- -- -- -- 20 -- 10 10 12 12 12 12 -- -- 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. Industrial temperature range product for the 15ns speed grade is available as a standard device. 2. Pulse widths less than minimum values are not allowed. 3. Values guaranteed by design, not currently tested.
3.3V 330 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
510
30pF*
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or equivalent circuit
Figure 1. Output Load
*Includes jig and scope capacitances. 5
IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
SIGNAL DESCRIPTIONS
FIFO A and FIFO B are identical in every respect. The following description explains the interaction of input and output signals for FIFO A. The corresponding signal names for FIFO B are provided in parentheses.
INPUTS:
Data In (DA0 - DA8, DB0 - DB8) -- DA0 - DA8 are the nine data inputs for memory array A. DB0 - DB8 are the nine data inputs for memory array B.
When either of the two Read Enable, RENA1, RENA2 (RENB1, RENB2) associated with FIFO A (B) 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 FIFO A (B), the Empty Flag, EFA (EFB) will go LOW, inhibiting further read operations. Once a valid write operation has been accomplished, EFA (EFB) will go HIGH after tREF and a valid read can begin. The Read Enables, RENA1, RENA2 (RENB1, RENB2) are ignored when FIFO A (B) is empty. Output Enable (OEA, OEB) -- When Output Enable, OEA (OEB) is enabled (LOW), the parallel output buffers of FIFO A (B) receive data from their respective output register. When Output Enable, OEA (OEB) is disabled (HIGH), the QA (QB) output data bus is in a high-impedance state. Write Enable 2/Load (WENA2/LDA, WENB2/LDB) -- This is a dualpurpose pin. FIFO A (B) is configured at Reset to have programmable flags or to have two write enables, which allows depth expansion. If WENA2/LDA (WENB2/LDB) is set HIGH at Reset, RSA = LOW (RSB = LOW), this pin operates as a second Write Enable pin. If FIFO A (B) is configured to have two write enables, when Write Enable 1, WENA1 (WENB1) is LOW and WENA2/LDA (WENB2/LDB) is HIGH, data can be loaded into the input register and RAM array on the LOW-to-HIGH transition of every Write Clock, WCLKA (WCLKB). Data is stored in the array sequentially and independently of any on-going read operation. In this configuration, when WENA1 (WENB1) is HIGH and/or WENA2/LDA (WENB2/LDB) is LOW, the input register of Array A holds the previous data and no new data is allowed to be loaded into the register. To prevent data overflow, the Full Flag, FFA (FFB) will go LOW, inhibiting further write operations. Upon the completion of a valid read cycle, FFA (FFB) will go HIGH after tWFF, allowing a valid write to begin. WENA1, (WENB1) and WENA2/LDA (WENB2/LDB) are ignored when the FIFO is full. FIFO A (B) is configured to have programmable flags when the WENA2/ LDA (WENB2/LDB) is set LOW at Reset, RSA = LOW (RSB = LOW). Each FIFO
Reset (RSA, RSB) -- Reset of FIFO A (B) is accomplished whenever RSA (RSB) input is taken to a LOW state. During reset, the internal read and write pointers associated with the FIFO are set to the first location. A reset is required after power-up before a write operation can take place. The Full Flag, FFA (FFB) and Programmable Almost-Full Flag, PAFA (PAFB) will be reset to HIGH after tRSF. The Empty Flag, EFA (EFB) and Programmable Almost-Empty Flag, PAEA (PAEB) 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 (WCLKA, WCLKB) -- A write cycle to Array A (B) is initiated on the LOW-to-HIGH transition of WCLKA (WCLKB). Data set-up and hold times must be met with respect to the LOW-to-HIGH transition of WCLKA (WCLKB). The Full Flag, FFA (FFB) and Programmable Almost-Full Flag, PAFA (PAFB) are synchronized with respect to the LOW-to-HIGH transition of the Write Clock, WCLKA (WCLKB). The Write and Read clock can be asynchronous or coincident. Write Enable 1 (WENA1, WENB1) -- If FIFO A (B) is configured for programmable flags, WENA1 (WENB1) is the only enable control pin. In this configuration, when WENA1 (WENB1) is LOW, data can be loaded into the input register of RAM Array A (B) on the LOW-to-HIGH transition of every Write Clock, WCLKA (WCLKB). Data is stored in Array A (B) sequentially and independently of any on-going read operation. In this configuration, when WENA1 (WENB1) 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. See Write Enable 2 paragraph below for operation in this configuration. To prevent data overflow, FFA (FFB) will go LOW, inhibiting further write operations. Upon the completion of a valid read cycle, the FFA (FFB) will go HIGH after tWFF, allowing a valid write to begin. WENA1 (WENB1) is ignored when FIFO A (B) is full. Read Clock (RCLKA, RCLKB) -- Data can be read from Array A (B) on the LOW-to-HIGH transition of RCLKA (RCLKB). The Empty Flag, EFA (EFB) and Programmable Almost-Empty Flag, PAEA (PAEB) are synchronized with respect to the LOW-to-HIGH transition of RCLKA (RCLKB). The Write and Read Clock can be asynchronous or coincident. Read Enables (RENA1, RENA2, RENB1, RENB2) -- When both Read Enables, RENA1, RENA2 (RENB1, RENB2) are LOW, data is read from Array A (B) to the output register on the LOW-to-HIGH transition of the Read Clock, RCLKA (RCLKB).
CONTROLS:
LDA LDB 0
WENA1 WENB1 0
WCLKA WCLKB
OPERATION ON FIFO A OPERATION ON FIFO B Empty Offset (LSB) Empty Offset (MSB) Full Offset (LSB) Full Offset (MSB)
0 1 1
1 0 1
No Operation Write Into FIFO No Operation
NOTE: 4093 tbl 08 1. For the purposes of this table, WENA2 and WENB2 = VIH. 2. The same selection sequence applies to reading from the registers. RENA1 and RENA2 (RENB1 and RENB2) are enabled and read is performed on the LOW-to-HIGH transition of RCLKA (RCLKB).
Figure 2. Writing to Offset Registers for FIFOs A and B
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IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
contains 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 FIFO A (B) is configured to have programmable flags, when the WENA1 (WENB1) and WENA2/LDA (WENB2/LDB) are set LOW, data on the DA (DB) inputs are written into the Empty (Least Significant Bit) Offset register on the first LOW-to-HIGH transition of the WCLKA (WCLKB). Data are written into the Empty (Most Significant Bit) Offset register on the second LOW-to-HIGH transition of WCLKA (WCLKB), 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 WCLKA (WCLKB) 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 LDA (LDB) HIGH, FIFO A (B) is returned to normal read/write operation. When LDA (LDB) is set LOW, and WENA1 (WENB1) is LOW, the next offset register in sequence is written. The contents of the offset registers can be read on the QA (QB) outputs when WENA2/LDA (WENB2/LDB) is set LOW and both Read Enables RENA1, RENA2 (RENB1, RENB2) are set LOW. Data can be read on the LOW-to-HIGH transition of the Read Clock RCLKA (RCLKB). A read and write should not be performed simultaneously to the offset registers.
72V801 - 256 x 9 x 2 8 7 Empty Offset (LSB) Reg. Default Value 007H 8 0 8 0 8 7
72V811 - 512 x 9 x 2 0 Empty Offset (LSB) Default Value 007H 1 (MSB) 0 0 8 8 7
72V821 - 1,024 x 9 x 2 0 Empty Offset (LSB) Reg. Default Value 007H 1 (MSB) 00 0 8 7 Full Offset (LSB) Reg. Default Value 007H 0 0 (MSB) 0 8 1 (MSB) 00 0 0 0
8
7 Full Offset (LSB) Reg. Default Value 007H
0
8
7 Full Offset (LSB) Default Value 007H
8
0
8
1
72V831 - 2,048 x 9 x 2 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
72V841 - 4,096 x 9 x 2 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
72V851 - 8,192 x 9 x 2 0 Empty Offset (LSB) Default Value 007H 4 (MSB) 00000 0 Full Offset (LSB) Default Value 007H 4 (MSB) 00000
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0
0
Figure 3. Offset Register Formats and Default Values for the A and B FIFOs
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IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
OUTPUTS:
Full Flag (FFA, FFB) -- FFA (FFB) will go LOW, inhibiting further write operations, when Array A (B) is full. If no reads are performed after reset, FFA (FFB) will go LOW after 256 writes to the IDT72V801's FIFO A (B), 512 writes to the IDT72V811's FIFO A (B), 1,024 writes to the IDT72V821's FIFO A (B), 2,048 writes to the IDT72V831's FIFO A (B), 4,096 writes to the IDT72V841's FIFO A (B), or 8,192 writes to the IDT72V851's FIFO A (B). FFA (FFB) is synchronized with respect to the LOW-to-HIGH transition of the Write Clock WCLKA (WCLKB). Empty Flag (EFA, EFB) -- EFA (EFB) will go LOW, inhibiting further read operations, when the read pointer is equal to the write pointer, indicating that Array A (B) is empty. EFA (EFB) is synchronized with respect to the LOW-to-HIGH transition of the Read Clock RCLKA (RCLKB).
the IDT72V831's FIFO A (B), (4,096-m) writes to the IDT72V841's FIFO A (B), or (8,1912-m) writes to the IDT72V851's FIFO A (B). FFA (FFB) is synchronized with respect to the LOW-to-HIGH transition of the Write Clock WCLKA (WCLKB). The offset "m" is defined in the Full Offset Registers. If there is no Full offset specified, PAFA (PAFB) will go LOW at Full-7 words. PAFA (PAFB) is synchronized with respect to the LOW-to-HIGH transition of the Write Clock WCLKA (WCLKB). Programmable Almost-Empty Flag (PAEA, PAEB) -- PAEA (PAEB) 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, PAEA (PAEB) will go HIGH after "n+1" writes to FIFO A (B). If there is no Empty offset specified, PAEA (PAEB) will go LOW at Empty+7 words. PAEA (PAEB) is synchronized with respect to the LOW-to-HIGH transition of the Read Clock RCLKA (RCLKB). Data Outputs (QA0 - QA8, QB0 - QB8 ) -- QA0 - QA8 are the nine data outputs for memory array A, QB0 - QB8 are the nine data outputs for memory array B.
Programmable Almost-Full Flag (PAFA, PAFB) -- PAFA (PAFB) will go LOW when the amount of data in Array A (B) reaches the Almost-Full condition. If no reads are performed after reset, PAFA (PAFB) will go LOW after (256-m) writes to the IDT72V801's FIFO A (B), (512-m) writes to the IDT72V811's FIFO A (B), (1,024-m) writes to the IDT72V821's FIFO A (B), (2,048-m) writes to
TABLE 1: STATUS .LAGS .OR A AND B .I.OS
NUMBER OF WORDS IN ARRAY A NUMBER OF WORDS IN ARRAY B IDT72V801 0 1 to n(1) (n+1) to (256-(m+1)) (256-m)(2) to 255 256 IDT72V811 0 1 to n(1) (n+1) to (512-(m+1)) (512-m)(2) to 511 512 IDT72V821 0 1 to n(1) (n+1) to (1,024-(m+1)) (1,024-m)(2) to 1,023 1,024 H H H H L H H H L L L L H H H L H H H H FFA FFB PAFA PAFB PAEA PAEB EFA EFB
NUMBER OF WORDS IN ARRAY A NUMBER OF WORDS IN ARRAY B IDT72V831 0 1 to n(1) (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)
FFA FFB IDT72V851 0 1 to n(1) (n+1) to (8,192-(m+1)) (8,192-m)(2) to 8,191 8,192 H H H H L
PAFA PAFB H H H L L
PAEA PAEB L L H H H
EFA EFB L H H H H
IDT72V841 0 1 to n(1) (n+1) to (4,096-(m+1)) (4,096-m)(2) to 4,095 4,096
8
IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
tRS RSA (RSB) tRSS RENA1, RENA2 (RENB1, RENB2) tRSS WENA1 (WENB1) tRSS WENA2/LDA (1) (WENB2/LDB) tRSF EFA, PAEA (EFB, PAEB) tRSF FFA, PAFA (FFA, PAFA) tRSF QA0 - QA8 (QB0 - QB8) OEA (OEB) = 1 OEA (OEB) = 0
(2)
tRSR
tRSR
tRSR
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NOTES: 1. Holding WENA2/LDA (WENB2/LDB) HIGH during reset will make the pin act as a second Write Enable pin. Holding WENA2/LDA (WENB2/LDB) LOW during reset will make the pin act as a load enable for the programmable flag offset registers. 2. After reset, QA0 - QA8 (QB0 - QB8) will be LOW if OEA (OEB) = 0 and tri-state if OEA (OEB) = 1. 3. The clocks RCLKA, WCLKA (RCLKB, WCLKB) can be free-running during reset.
Figure 4. Reset Timing
tCLK tCLKH WCLKA (WCLKB) tDH tDS (DA0 - DA8 DB0 - DB8) DATA IN VALID WENA1 (WENB1) tENS tENH NO OPERATION tENS WENA2 (WENB2) (If Applicable) tWFF FFA (FFB) tSKEW1(1) RCLKA (RCLKB) tWFF tENH NO OPERATION tCLKL
RENA1, RENA2 (RENB1, RENB2)
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NOTE: 1. tSKEW1 is the minimum time between a rising RCLKA (RCLKB) edge and a rising WCLKA (WCLKB) edge for FFA (FFB) to change during the current clock cycle. If the time between the rising edge of RCLKA (RCLKB) and the rising edge of WCLKA (WCLKB) is less than tSKEW1, then FFA (FFB) may not change state until the next WCLKA (WCLKB) edge.
Figure 5. Write Cycle Timing
9
IDT72V801/72V811/72V821/72V831/72V841/72V851
tCLKH RCLKA (RCLKB) tENS RENA1, RENA2 (RENB1, RENB2) tREF EFA (EFB) tA QA0 - QA8 (QB0 - QB8) OEA (OEB) tOLZ tOE tSKEW1 WCLKA, WCLKB
(1)
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
tCLK tCLKL
tENH NO OPERATION tREF
VALID DATA tOHZ
WENA1 (WENB1) WENA2 (WENB2)
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NOTE: 1. tSKEW1 is the minimum time between a rising WCLKA (WCLKB) edge and a rising RCLKA (RCLKB) edge for EFA (EFB) to change during the current clock cycle. If the time between the rising edge of RCLKA (RCLKB) and the rising edge of WCLKA (WCLKB) is less than tSKEW1, then EFA (EFB) may not change state until the next RCLKA (RCLKB) edge.
Figure 6. Read Cycle Timing
WCLKA (WCLKB) tDS DA0 - DA8 (DB0 - DB8) tENS WENA1 (WENB1) tENS WENA2 (WENB2) (If Applicable) tSKEW1 RCLKA (RCLKB) tREF EFA (EFB) RENA1, RENA2 (RENB1, RENB2) QA0 - QA8 (QB0 - QB8) OEA (OEB)
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D1 D0 (First Valid
D2
D3
tFRL(1)
tENS
tA D0 tOLZ tOE
tA D1
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 (EFA, EFB = LOW).
Figure 7. First Data Word Latency Timing
10
IDT72V801/72V811/72V821/72V831/72V841/72V851
NO WRITE WCLKA (WCLKB) DA0 - DA8 (DB0 - DB8) tWFF FFA (FFB) tENS WENA1 (WENB1) tENS WENA2 (WENB2) (If Applicable) RCLKA (RCLKB) tENS RENA1 (RENB2) OEA LOW (OEB) QA0 - QA8 (QB0 - QB8) tA tENH tENH tWFF tSKEW1 tDS
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
NO WRITE tSKEW1 NO WRITE
tDH
tWFF tENS
(1)
tENS
(1)
tENH tENS
tENH
tA DATA IN OUTPUT REGISTER DATA READ NEXT DATA READ
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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
WCLKA (WCLKB) tDS DA0 - DA8 (DB0 - DB8) tENS WENA1, (WENB1) tENS WENA2 (WENB2) (If Applicable) tSKEW1 RCLKA (RLCKB) tREF EFA (EFB) tREF tREF tFRL
(1)
tDS DATA WRITE 1 tENH tENS DATA WRITE 2 tENH
tENH
tENS
tENH
tSKEW1
tFRL
(1)
RENA1, RENA2 (RENB1, RENB2) OEA (OEB) QA0 - QA8 (QB0 - QB8) LOW tA DATA IN OUTPUT REGISTER DATA READ
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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 (EFA, EFB = LOW).
Figure 9. Empty Flag Timing
11
IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
tCLKH WCLKA (WCLKB)
tCLKL
(4)
tENS WENA1 (WENB1 tENS WENA2 (WENB2) (If Applicable)
tENH
tENH
tPAF PAFA (PAFB) Full - (m+1) words in FIFO
(1)
Full - m words in FIFO tSKEW2
(2)
(3)
tPAF
RCLKA (RCLKB) tENS RENA1, RENA2 (RENB1, RENB2) tENH
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NOTES: 1. m = PAF offset. 2. (256-m) words for the IDT72V801, (512-m) words the IDT72V811, (1,024-m) words for the IDT72V821, (2,048-m) words for the IDT72V831, (4,096-m) words for the IDT72V841, or (8,192-m) words for the IDT72V851. 3. tSKEW2 is the minimum time between a rising RCLKA (RCLKB) edge and a rising WCLKA (WCLKB) edge for PAFA (PAFB) to change during that clock cycle. If the time between the rising edge of RCLKA (RCLKB) and the rising edge of WCLKA (WCLKB) is less than tSKEW2, then PAFA (PAFB) may not change state until the next WCLKA (WCLKB) rising edge. 4. If a write is performed on this rising edge of the Write Clock, there will be Full - (m-1) words in FIFO A (B) when PAFA (PAFB) goes LOW.
Figure 10. Programmable Full Flag Timing
tCLKH WCLKA (WCLKB) tENS WENA1 (WENB1) tENS WENA2 (WENB2) (If Applicable) PAEA, PAEB n words in FIFO
(1)
tCLKL
tENH
tENH
n+1 words in FIFO tPAE
(3)
tSKEW2 (2) RCLKA (RCLKB)
tPAE
tENS RENA1, RENA2 (RENB1, RENB2)
tENH
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NOTES: 1. n = PAE offset. 2. tSKEW2 is the minimum time between a rising WCLKA (WCLKB) edge and a rising RCLKA (RCLKB) edge for PAEA (PAEB) to change during that clock cycle. If the time between the rising edge of WCLKA (WCLKB) and the rising edge of RCLKA (RCLKB) is less than tSKEW2, then PAEA (PAEB) may not change state until the next RCLKA (RCLKB) rising edge. 3. If a read is performed on this rising edge of the Read Clock, there will be Empty + (n-1) words in FIFO A (B) when PAEA (PAEB) goes LOW.
Figure 11. Programmable Empty Flag Timing
12
IDT72V801/72V811/72V821/72V831/72V841/72V851
tCLK tCLKH WCLKA (WCLKB) tENS tENH tCLKL
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
LDA (LDB) tENS
WENA1 (WENB1) tDS DA0 - DA7 (DB0 - DB7) PAE OFFSET (LSB) PAE OFFSET (MSB) PAF OFFSET (LSB) PAF OFFSET (MSB)
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tDH
Figure 12. Write Offset Register Timing
tCLK tCLKH RCLKA (RCLKB) tENS LDA (LDB) tENS RENA1, RENA2 (RENB1, RENB2) tA QA0 - QA7 (QB0 - QB7) DATA IN OUTPUT REGISTER EMPTY OFFSET (LSB) EMPTY OFFSET (MSB) FULL OFFSET (LSB) FULL OFFSET (MSB)
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tCLKL
tENH
Figure 13. Read Offset Register Timing
13
IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
OPERATING CON.IGURATIONS
SINGLE DEVICE CONFIGURATION -- When FIFO A (B) is in a Single Device Configuration, the Read Enable 2 RENA2 (RENB2) control input can
be grounded (see Figure 14). In this configuration, the Write Enable 2/Load WENA2/LDA (WENB2/LDB) pin is set LOW at Reset so that the pin operates as a control to load and read the programmable flag offsets.
RSA (RSB) WCLKA (WCLKB) WENA1 (WENB1) WENA2/LDA (WENB2/LDB) DA0 - DA8 (DB0 - DB8) FFA (FFB) PAFA (PAFB) IDT 72V801 72V811 72V821 72V831 72V841 72V851 FIFO A (B) RCLKA (RCLKB) RENA1 (RENB1) OEA (OEB) QA0 - QA8 (QB0 - QB8) EFA (EFB) PAEA (PAEB)
RENA2 (RENB2)
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Figure 14. Block Diagram of One of the IDT72V801/72V811/72V821/72V831/72V841/72V851's two FIFOs configured as a single device WIDTH EXPANSION CONFIGURATION -- Word width may be increased simply by connecting the corresponding input control signals of FIFOs A and B. A composite flag should be created for each of the endpoint status flags EFA and EFB, also FFAand FFB). The partial status flags PAEA, PAFB, PAEA and PAFB can be detected from any one device. Figure 15 demonstrates an 18-bit word width using the two FIFOs contained in one IDT72V801/72V811/72V821/72V831/72V841/72V851. Any word width can
9 RESET RSA DATA IN WRITE CLOCK WRITE ENABLE WRITE ENABLE/LOAD FULL FLAG 18 9 DA0 - DA8 WCLKA WENA1 WENA2/LDA FFA FFB RSB EFA EFB RCLKB RENB1 OEB EMPTY FLAG READ CLOCK READ ENABLE OUTPUT ENABLE
be attained by adding additional IDT72V801/72V811/72V821/72V831/ 72V841/72V851s. When these devices are in a Width Expansion Configuration, the Read Enable 2 (RENA2 and RENB2) control inputs can be grounded (see Figure 15). In this configuration, the Write Enable 2/Load (WENA2/LDA, WENB2/LDB) pins are set LOW at Reset so that the pin operates as a control to load and read the programmable flag offsets.
DB0 - DB8
RAM ARRAY RCLKA WCLKB A 256x9 RENA1 WENB1 512x9 1,024x9 OEA1 2,048x9 2WENB2/LDB 4,096x9 8,192x9
RAM ARRAY B 256x9 512x9 1,024x9 2,048x9 4,096x9 8,192x9
QB0 - QB8
9
18
DATA OUT
RENA2
QA0 - QA8 RENB2
9
4093 drw 17
Figure 15. Block diagram of the two FIFOs contained in one IDT72V801/72V811/72V821/72V831/72V841/72V851 configured for an 18-bit width-expansion
14
IDT72V801/72V811/72V821/72V831/72V841/72V851
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
TWO PRIORITY DATA BU..ER CON.IGURATION
The two FIFOs contained in the IDT72V801/72V811/72V821/72V831/ 72V841/72V851 can be used to prioritize two different types of data shared on a system bus. When writing from the bus to the FIFO, control logic sorts
the intermixed data according to type, sending one kind to FIFO A and the other kind to FIFO B. Then, at the outputs, each data type is transferred to its appropriate destination. Additional IDT72V801/72V811/72V821/72V831/ 72V841/72V851s permit more than two priority levels. Priority buffering is particularly useful in network applications.
Image Processing Card Clock
Control Logic
9
RAM ARRAY A RCLKA WCLKA OEA WENA1 RENA DA0-DA8 QA0-QA8 WENA2 RENA2 IDT 72V801 72V811 72V821 72V831 72V841 72V851 RAM ARRAY B WCLKB RCLKB WENB1
9
Address Control I/O Data
Processor Clock Address Control Data
9
VCC
Data
Control Logic
9-bit bus
Voice Processing Card Clock
9
Control Logic
RAM
OEB2 RENB1
Address Control I/O Data
DB0-DB8
9
QB0-QB8 WENB2 RENB2
9
Data
VCC
4093 drw 18
Figure 16. Block Diagram of Two Priority Configuration
BIDIRECTIONAL CON.IGURATION
The two FIFOs of the IDT72V801/72V811/72V821/72V831/72V841/ 72V851 can be used to buffer data flow in two directions. In the example that
follows, a processor can write data to a peripheral controller via FIFO A, and, in turn, the peripheral controller can write the processor via FIFO B.
VCC
RAM ARRAY A WENA2 RENA2 WCLKA WENA1 RCLKA OEA Peripheral Controller
9
Processor Clock Address Control Data
9
9
RENA1 DA0-DA8 QA0-QA8 IDT 72V801 72V811 72V821 72V831 72V841 72V851 RAM ARRAY B RCLKB WENB1 RENB1 WCLKB OEB QB0-QB8 DB0-DB8 RENB2 WENB2
DMA Clock
Control Logic
Control Logic
Address Control I/O Data Data
9-bit bus
9-bit bus
9
RAM
9
9
9
4093 drw 19
VCC
Figure 17. Block Diagram of Bidirectional Configuration
15
DEPTH EXPANSION -- These FIFOs can be adapted to applications that require greater than 256/512/1,024/2,048/4,096/8,192 words. The existence of double enable pins on the read and write ports allow depth expansion. The Write Enable 2/Load (WENA2, WENB2) pins are used as a second write enables 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.
The IDT72V801/72V811/72V821/72V831/72V841/72V851 operates in the Depth Expansion configuration when the following conditions are met: 1. WENA2/LDA and WENB2/LDB pins are held HIGH during Reset so that these pins operate as second Write Enables. 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.
ORDERING IN.ORMATION
IDT XXXXX Device Type L Power XX Speed PF Package Process/ Temperature Range BLANK I(1) PF TF 10 15 20 L 72V801 72V811 72V821 72V831 72V841 72V851 Commercial (0C to +70C) Industrial (-40C to +85C) Thin Quad Flatpack (TQFP, PN64-1) Slim Thin Plastic Quad Flatpack (STQFP, PP64-1) Commercial Only Commercial And Industrial Commercial Only Low Power 256 x 9 3.3 Volt DUAL SyncFIFO 512 x 9 3.3 Volt DUAL SyncFIFO 1,024 x 9 3.3 Volt DUAL SyncFIFO 2,048 x 9 3.3 Volt DUAL SyncFIFO 4,096 x 9 3.3 Volt DUAL SyncFIFO 8,192 x 9 3.3 Volt DUAL SyncFIFO
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Clock Cycle Time (tCLK), speed in Nanoseconds
NOTE: 1. Industrial temperature range product for the 15ns speed grade is available as a standard device.
DATASHEET DOCUMENT HISTORY
04/24/2001 pgs. 4, 5 and 16 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 for TECH SUPPORT: (408) 330-1753 FIFOhelp@idt.com PF Pkg: www.idt.com/docs/PSC4036.pdf TF Pkg: www.idt.com/docs/PSC4046.pdf
The SyncFIFO is a trademark and the IDT logo is a registered trademark of Integrated Device Technology, Inc.
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