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CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
IDT7200L IDT7201LA IDT7202LA
FEATURES:
* * * * *
DESCRIPTION:
The IDT7200/7201/7202 are dual-port memories that load and empty data on a first-in/first-out basis. The devices use Full and Empty flags to prevent data overflow and underflow and expansion logic to allow for unlimited expansion capability in both word size and depth. The reads and writes are internally sequential through the use of ring pointers, with no address information required to load and unload data. Data is toggled in and out of the devices through the use of the Write (W) and Read (R) pins. The devices utilize a 9-bit wide data array to allow for control and parity bits at the user's option. This feature is especially useful in data communications applications where it is necessary to use a parity bit for transmission/reception error checking. It also features a Retransmit (RT) capability that allows for reset of the read pointer to its initial position when RT is pulsed LOW to allow for retransmission from the beginning of data. A Half-Full Flag is available in the single device mode and width expansion modes. These FIFOs are fabricated using IDT's high-speed CMOS technology. They are designed for those applications requiring asynchronous and simultaneous read/writes in multiprocessing and rate buffer applications. Military grade product is manufactured in compliance with the latest revision of MIL-STD-883, Class B.
* * * * * * * * * *
*
First-In/First-Out dual-port memory 256 x 9 organization (IDT7200) 512 x 9 organization (IDT7201) 1,024 x 9 organization (IDT7202) Low power consumption -- Active: 440mW (max.) --Power-down: 28mW (max.) Ultra high speed--12ns access time Asynchronous and simultaneous read and write Fully expandable by both word depth and/or bit width Pin and functionally compatible with 720X family Status Flags: Empty, Half-Full, Full Auto-retransmit capability High-performance CEMOSTM technology Military product compliant to MIL-STD-883, Class B Standard Military Drawing #5962-87531, 5962-89666, 5962-89863 and 5962-89536 are listed on this function Dual versions available in the TSSOP package. For more information, see IDT7280/7281/7282 data sheet IDT7280 = 2 x IDT7200 IDT7281 = 2 x IDT7201 IDT7282 = 2 x IDT7202 Industrial temperature range (-40oC to +85oC) is available (plastic packages only)
FUNCTIONAL BLOCK DIAGRAM
DATA INPUTS (D0-D8) W WRITE CONTROL WRITE POINTER RAM ARRAY 256 x 9 512 x 9 1,024 x 9
READ POINTER
R
READ CONTROL
THREESTATE BUFFERS DATA OUTPUTS (Q0-Q8)
RS RESET LOGIC FL/RT
FLAG LOGIC EXPANSION LOGIC
EF FF
XI
XO/HF
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IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc.
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES 1
2002 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
SEPTEMBER 2002
DSC-2679/9
IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
D3
D8
W D8 D3 D2 D1 D0 XI FF Q0 Q1 Q2 Q3 Q8 GND
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
VCC D4 D5 D6 D7 FL/RT RS EF XO/HF Q7 Q6 Q5 Q4 R
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4 3 2 1 32 31 30 D2 D1 D0 XI FF Q0 Q1 NC Q2 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Q8 GND NC R
D5
INDEX
W NC
VCC D4
PIN CONFIGURATIONS
29 28 27 26 25 24 23 22 21
D6 D7 NC FL/RT RS EF XO/HF Q7 Q6
Q3
Q4
Q5
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Package Type PLASTIC DIP(1) PLASTIC THIN DIP CERDIP(1) THIN CERDIP SOIC
Reference Identifier P28-1 P28-2 D28-1 D28-3 SO28-3 TOP VIEW
Order Code P TP D TD SO
Package Type LCC(1) PLCC
Reference Identifier L32- 1 J32-1 TOP VIEW
Order Code L J
NOTE: 1. The 600-mil-wide DIP (P28-1 and D28-1) and LCC are not available for the IDT7200.
RECOMMENDED DC OPERATING CONDITIONS ABSOLUTE MAXIMUM RATINGS
Symbol VTERM Rating Terminal Voltage with Respect to GND Storage Temperature DC Output Current Com'l & Ind'l -0.5 to +7.0 Mil. -0.5 to +7.0 Unit V Symbol VCC GND VIH(1) VIH(1) VIL(2) TA TA TA Parameter Supply Voltage Commercial/Industrial/Military Supply Voltage Input High Voltage Com'l/Ind'l Input High Voltage Military Input Low Voltage Commercial/Industrial/Military Operating Temperature Commercial Operating Temperature Industrial Operating Temperature Military Min. 4.5 0 2.0 2.2 -- 0 -40 -55 Typ. 5.0 0 -- -- -- -- -- -- Max. Unit 5.5 V 0 -- -- 0.8 70 85 125 V V V V C C C
TSTG IOUT
-55 to +125 -50 to +50
-65 to +155 -50 to +50
C mA
NOTE: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
NOTES: 1. For RT/RS/XI input, VIH = 2.6V (commercial). For RT/RS/XI input, VIH = 2.8V (military). 2. 1.5V undershoots are allowed for 10ns once per cycle.
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IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS
(Commercial: VCC = 5V 10%, TA = 0oC to +70oC; Industrial: VCC = 5V 10%, TA = -40oC to +85oC; Military: VCC = 5V 10%, TA = -55oC to +125oC)
IDT7200L IDT7201LA IDT7202LA Com'l & Ind'l(1) tA = 12, 15, 20, 25, 35, 50 ns Min. Max. -1 -10 2.4 -- -- -- 1 10 -- 0.4 80 5 IDT7200L IDT7201LA IDT7202LA Military(2) tA = 20, 30, 50, 80 ns Min. Max. -10 -10 2.4 -- -- -- 10 10 -- 0.4 100 15
Symbol ILI(3) ILO(4) VOH VOL ICC1(5,6,7) ICC2(5,8)
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 (R=W=RS=FL/RT=VIH)
Unit A A V V mA mA
NOTES: 1. Industrial temperature range product for the 15ns and 25 ns speed grades are available as a standard device. 2. Military speed grades of 50ns and 80ns are only available for the IDT7201LA. 3. Measurements with 0.4 VIN VCC. 4. R VIH, 0.4 VOUT VCC. 5. Tested with outputs open (IOUT = 0). 6. Tested at f = 20 MHz. 7. Typical ICC1 = 15 + 2*fS + 0.02*CL*fS (in mA) with VCC = 5V, TA = 25C, fS = WCLK frequency = RCLK frequency (in MHz, using TTL levels), data switching at fS/2, CL = capacitive load (in pF). 8. All Inputs = VCC - 0.2V or GND + 0.2V.
CAPACITANCE (TA = +25C, f = 1.0 MHz)
Symbol CIN COUT Parameter Input Capacitance Output Capacitance Condition VIN = 0V VOUT = 0V Max. 8 8 Unit pF pF
NOTE: 1. Characterized values, not currently tested.
5V
1.1K TO OUTPUT PIN 680
GND to 3.0V 5ns 1.5V 1.5V See Figure 1
AC TEST CONDITIONS
Input Pulse Levels Input Rise/Fall Times Input Timing Reference Levels Output Reference Levels Output Load
30pF*
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or equivalent circuit
Figure 1. Output Load
* Includes scope and jig capacitances.
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IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
AC ELECTRICAL CHARACTERISTICS(1)
(Commercial: VCC = 5V 10%, TA = 0C to +70C; Industrial: VCC = 5V 10%, TA = -40C to +85C; Military: VCC = 5V 10%, TA = -55C to +125C)
Commercial IDT7200L12 IDT7201LA12 IDT7202LA12 Min. Max. -- 20 -- 8 12 3 5 5
(4) (4,5) (3)
Symbol tS tRC tA tRR tRPW tRLZ tWLZ tDV tRHZ tWC tWPW tWR tDS tDH tRSC tRS tRSS tRSR tRTC tRT tRTS tRTR tEFL tHFH,FFH tRTF tREF tRFF tRPE tWEF tWFF tWHF tRHF tWPF tXOL tXOH tXI tXIR tXIS
Parameter Shift Frequency Read Cycle Time Access Time Read Recovery Time Read Pulse Width Read Pulse Low to Data Bus at Low Z(4) Write Pulse High to Data Bus at Low Z Data Valid from Read Pulse High Read Pulse High to Data Bus at High Z Write Cycle Time Write Pulse Width(3) Write Recovery Time Data Set-up Time Data Hold Time Reset Cycle Time Reset Pulse Width(3) Reset Set-up Time(4) Reset Recovery Time Retransmit Cycle Time Retransmit Pulse Width(3) Retransmit Set-up Time(4) Retransmit Recovery Time Reset to Empty Flag Low Reset to Half-Full and Full Flag High Retransmit Low to Flags Valid Read Low to Empty Flag Low Read High to Full Flag High Read Pulse Width after EF High Write High to Empty Flag High Write Low to Full Flag Low Write Low to Half-Full Flag Low Read High to Half-Full Flag High Write Pulse Width after FF High Read/Write to XO Low Read/Write to XO High XI Pulse Width(3) XI Recovery Time XI Set-up Time
Com'l & Ind'l(2) IDT7200L15 IDT7201LA15 IDT7202LA15 Min. Max. -- 25 -- 10 15 3 5 5 -- 25 15 10 11 0 25 15 15 10 25 15 15 10 -- -- -- -- -- 15 -- -- -- -- 15 -- -- 15 10 10 40 -- 15 -- -- -- -- -- 15 -- -- -- -- -- -- -- -- -- -- -- -- -- 25 25 25 15 15 -- 15 15 25 25 -- 15 15 -- -- --
Com'l & Mil. IDT7200L20 IDT7201LA20 IDT7202LA20 Min. Max. -- 30 -- 10 20 3 5 5 -- 30 20 10 12 0 30 20 20 10 30 20 20 10 -- -- -- -- -- 20 -- -- -- -- 20 -- -- 20 10 10 33.3 -- 20 -- -- -- -- -- 15 -- -- -- -- -- -- -- -- -- -- -- -- -- 30 30 30 20 20 -- 20 20 30 30 -- 20 20 -- -- --
Com'l & Ind'l(2) IDT7200L25 IDT7201LA25 IDT7202LA25 Min. Max. -- 35 -- 10 25 3 5 5 -- 35 25 10 15 0 35 25 25 10 35 25 25 10 -- -- -- -- -- 25 -- -- -- -- 25 -- -- 25 10 10 28.5 -- 25 -- -- -- -- -- 18 -- -- -- -- -- -- -- -- -- -- -- -- -- 35 35 35 25 25 -- 25 25 35 35 -- 25 25 -- -- --
Unit MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
50 -- 12 -- -- -- -- -- 12 -- -- -- -- -- -- -- -- -- -- -- -- -- 12 17 20 12 14 -- 12 14 17 17 -- 12 12 -- -- --
-- 20 12 8 9 0 20 12 12 8 20 12 12 8 -- -- -- -- -- 12 -- -- -- -- 12 -- -- 12 8 8
NOTES: 1. Timings referenced as in AC Test Conditions. 2. Industrial temperature range product for 15ns and 25ns speed grades are available as a standard device. 3. Pulse widths less than minimum value are not allowed. 4. Values guaranteed by design, not currently tested. 5. Only applies to read data flow-through mode
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IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
AC ELECTRICAL CHARACTERISTICS(1) (Continued)
(Commercial: VCC = 5V 10%, TA = 0C to +70C; Industrial: VCC = 5V 10%, TA = -40C to +85C; Military: VCC = 5V 10%, TA = -55C to +125C)
Military IDT7200L30 IDT7201LA30 IDT7202LA30 Min. Max. -- 40 -- 10 30 3 5 5 -- 40 30 10 18 0 40 30 30 10 40 30 30 10 -- -- -- -- -- 30 -- -- -- -- 30 -- -- 30 10 10 25 -- 30 -- -- -- -- -- 20 -- -- -- -- -- -- -- -- -- -- -- -- -- 40 40 40 30 30 -- 30 30 40 40 -- 30 30 -- -- -- Commercial IDT7200L35 IDT7201LA35 IDT7202LA35 Min. Max. -- 45 -- 10 35 3 5 5 -- 45 35 10 18 0 45 35 35 10 45 35 35 10 -- -- -- -- -- 35 -- -- -- -- 35 -- -- 35 10 10 22.2 -- 35 -- -- -- -- -- 20 -- -- -- -- -- -- -- -- -- -- -- -- -- 45 45 45 30 30 -- 30 30 45 45 -- 35 35 -- -- -- Com'l & Mil.(2) IDT7200L50 IDT7201LA50 IDT7202LA50 Min. Max. -- 65 -- 15 50 3 5 5 -- 65 50 15 30 5 65 50 50 15 65 50 50 15 -- -- -- -- -- 50 -- -- -- -- 50 -- -- 50 10 15 15 -- 50 -- -- -- -- -- 30 -- -- -- -- -- -- -- -- -- -- -- -- -- 65 65 65 45 45 -- 45 45 65 65 -- 50 50 -- -- -- Military(2)
Symbol tS tRC tA tRR tRPW tRLZ tWLZ tDV tRHZ tWC tWPW tWR tDS tDH tRSC tRS tRSS tRSR tRTC tRT tRTS tRTR tEFL tHFH,FFH tRTF tREF tRFF tRPE tWEF tWFF tWHF tRHF tWPF tXOL tXOH tXI tXIR tXIS Shift Frequency
Parameter Read Cycle Time Access Time Read Recovery Time Read Pulse Width(3) Read Pulse Low to Data Bus at Low Z(4) Write Pulse High to Data Bus at Low Z(4, 5) Data Valid from Read Pulse High Read Pulse High to Data Bus at High Z(4) Write Cycle Time Write Pulse Width(3) Write Recovery Time Data Set-up Time Data Hold Time Reset Cycle Time Reset Pulse Width(3) Reset Set-up Time(4) Reset Recovery Time Retransmit Cycle Time Retransmit Pulse Width(3) Retransmit Set-up Time(4) Retransmit Recovery Time Reset to Empty Flag Low Reset to Half-Full and Full Flag High Retransmit Low to Flags Valid Read Low to Empty Flag Low Read High to Full Flag High Read Pulse Width after EF High Write High to Empty Flag High Write Low to Full Flag Low Write Low to Half-Full Flag Low Read High to Half-Full Flag High Write Pulse Width after FF High Read/Write to XO Low Read/Write to XO High XI Pulse Width(3) XI Recovery Time XI Set-up Time
IDT7201LA80 Min. Max. -- 100 -- 20 80 3 5 5 -- 100 80 20 40 10 100 80 80 20 100 80 80 20 -- -- -- -- -- 80 -- -- -- -- 80 -- -- 80 10 15 10 -- 80 -- -- -- -- -- 30 -- -- -- -- -- -- -- -- -- -- -- -- -- 100 100 100 60 60 -- 60 60 100 100 -- 80 80 -- -- --
Unit MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
NOTES: 1. Timings referenced as in AC Test Conditions 2. Military speed grades of 50ns and 80ns are only available for IDT7201LA. 3. Pulse widths less than minimum value are not allowed. 4. Values guaranteed by design, not currently tested. 5. Only applies to read data flow-through mode.
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IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
SIGNAL DESCRIPTIONS INPUTS:
DATA IN (D0 - D8) Data inputs for 9-bit wide data.
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. Both the Read Enable (R) and Write Enable (W) inputs must be in the HIGH state during the window shown in Figure 2, (i.e., tRSS before the rising edge of RS) and should not change until tRSR after the rising edge of RS. Half-Full Flag (HF) will be reset to HIGH after Reset (RS). WRITE ENABLE (W) A write cycle is initiated on the falling edge of this input if the Full Flag (FF) is not set. Data set-up and hold times must be adhered to with respect to the rising edge of the Write Enable (W). Data is stored in the RAM array sequentially and independently of any on-going read operation. After half of the memory is filled and at the falling edge of the next write operation, the Half-Full Flag (HF) will be set to LOW and will remain set until the difference between the write pointer and read pointer is less than or equal to one half of the total memory of the device. The Half-Full Flag (HF) is then reset by the rising edge of the read operation. To prevent data overflow, the Full Flag (FF) will go LOW, inhibiting further write operations. Upon the completion of a valid read operation, the Full Flag (FF) will go HIGH after tRFF, allowing a valid write to begin. When the FIFO is full, the internal write pointer is blocked from W, so external changes in W will not affect the FIFO when it is full. READ ENABLE (R) A read cycle is initiated on the falling edge of the Read Enable (R) provided the Empty Flag (EF) is not set. The data is accessed on a First-In/First-Out basis, independent of any ongoing write operations. After Read Enable (R) goes HIGH, the Data Outputs (Q0 - Q8) will return to a high impedance condition until the next Read operation. When all data has been read from the FIFO, the Empty Flag (EF) will go LOW, allowing the "final" read cycle but inhibiting further read operations with the data outputs remaining in a high impedance state. Once a valid write operation has been accomplished, the Empty Flag (EF) will go HIGH after tWEF and a valid Read can then begin. When the FIFO is empty, the internal read pointer is blocked from R so external changes in R will not affect the FIFO when it is empty. FIRST LOAD/RETRANSMIT (FL/RT) This is a dual-purpose input. In the Depth Expansion Mode, this pin is grounded to indicate that it is the first loaded (see Operating Modes). In the Single
Device Mode, this pin acts as the retransmit input. The Single Device Mode is initiated by grounding the Expansion In (XI). The IDT7200/7201A/7202A can be made to retransmit data when the Retransmit Enable control (RT) input is pulsed LOW. A retransmit operation will set the internal read pointer to the first location and will not affect the write pointer. Read Enable (R) and Write Enable (W) must be in the HIGH state during retransmit. This feature is useful when less than 256/512/1,024 writes are performed between resets. The retransmit feature is not compatible with the Depth Expansion Mode and will affect the Half-Full Flag (HF), depending on the relative locations of the read and write pointers. EXPANSION IN (XI) This input is a dual-purpose pin. Expansion In (XI) is grounded to indicate an operation in the single device mode. Expansion In (XI) is connected to Expansion Out (XO) of the previous device in the Depth Expansion or Daisy Chain Mode.
OUTPUTS:
FULL FLAG (FF) The Full Flag (FF) will go LOW, inhibiting further write operation, when the write pointer is one location less than the read pointer, indicating that the device is full. If the read pointer is not moved after Reset (RS), the Full-Flag (FF) will go LOW after 256 writes for IDT7200, 512 writes for the IDT7201A and 1,024 writes for the IDT7202A. 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 that the device is empty. EXPANSION OUT/HALF-FULL FLAG (XO/HF) This is a dual-purpose output. In the single device mode, when Expansion In (XI) is grounded, this output acts as an indication of a half-full memory. After half of the memory is filled and at the falling edge of the next write operation, the Half-Full Flag (HF) will be set LOW and will remain set until the difference between the write pointer and read pointer is less than or equal to one half of the total memory of the device. The Half-Full Flag (HF) is then reset by using rising edge of the read operation. In the Depth Expansion Mode, Expansion In (XI) is connected to Expansion Out (XO) of the previous device. This output acts as a signal to the next device in the Daisy Chain by providing a pulse to the next device when the previous device reaches the last location of memory. DATA OUTPUTS (Q0 - Q8) Data outputs for 9-bit wide data. This data is in a high impedance condition whenever Read (R) is in a HIGH state.
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IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
tRSC RS W tRSS R tEFL EF tHFH , tFFH HF, FF
NOTES: 1. EF, FF, HF may change status during Reset, but flags will be valid at tRSC. 2. W and R = VIH around the rising edge of RS.
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tRS tRSS tRSR
Figure 2. Reset
tRC tA R tRLZ Q0-Q8 tWPW W tDS D0-D8
tRR
tA
tRPW
tDV DATA OUT VALID tWC tWR
tRHZ DATA OUT VALID
tDH DATA IN VALID
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DATA IN VALID
Figure 3. Asynchronous Write and Read Operation
LAST WRITE R
IGNORED WRITE
FIRST READ
ADDITIONAL READS
FIRST WRITE
W tWFF FF tRFF
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Figure 4. Full Flag From Last Write to First Read
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IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
LAST READ W IGNORED READ FIRST WRITE ADDITIONAL WRITES
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
FIRST READ
R tREF EF tA DATA OUT VALID VALID
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tWEF
Figure 5. Empty Flag From Last Read to First Write
tRTC tRT RT tRTS W,R tRTF HF, EF, FF FLAG VALID
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tRTR
Figure 6. Retransmit
W
tWEF
EF tRPE R
Figure 7. Minimum Timing for an Empty Flag Coincident Read Pulse
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R
tRFF
FF tWPF W
Figure 8. Minimum Timing for a Full Flag Coincident Write Pulse
8
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IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
W R tWHF HF
HALF-FULL OR LESS MORE THAN HALF-FULL
tRHF
HALF-FULL OR LESS
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Figure 9. Half-Full Flag Timing
WRITE TO LAST PHYSICAL LOCATION
W R tXOL XO tXOH
READ FROM LAST PHYSICAL LOCATION
tXOL
tXOH
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Figure 10. Expansion Out
tXI XI tXIS W R
WRITE TO FIRST PHYSICAL LOCATION
tXIR
tXIS
READ FROM FIRST PHYSICAL LOCATION
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Figure 11. Expansion In
OPERATING MODES:
Care must be taken to assure that the appropriate flag is monitored by each system (i.e. FF is monitored on the device where W is used; EF is monitored on the device where R is used). For additional information, refer to Tech Note 8: Operating FIFOs on Full and Empty Boundary Conditions and Tech Note 6: Designing with FIFOs. SINGLE DEVICE MODE A single IDT7200/7201A/7202A may be used when the application requirements are for 256/512/1,024 words or less. These devices are in a Single Device Configuration when the Expansion In (XI) control input is grounded (see Figure 12). DEPTH EXPANSION The IDT7200/7201A/7202A can easily be adapted to applications when the requirements are for greater than 256/512/1,024 words. Figure 14 demonstrates Depth Expansion using three IDT7200/7201A/7202As. Any
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depth can be attained by adding additional IDT7200/7201A/7202As. These FIFOs operate in the Depth Expansion mode when the following conditions are met: 1. The first device must be designated by grounding the First Load (FL) control input. 2. All other devices must have FL in the HIGH state. 3. The Expansion Out (XO) pin of each device must be tied to the Expansion In (XI) pin of the next device. See Figure 14. 4. External logic is needed to generate a composite Full Flag (FF) and Empty Flag (EF). This requires the ORing of all EFs and ORing of all FFs (i.e. all must be set to generate the correct composite FF or EF). See Figure 14. 5. The Retransmit (RT) function and Half-Full Flag (HF) are not available in the Depth Expansion Mode. For additional information, refer to Tech Note 9: Cascading FIFOs or FIFO Modules.
IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
USAGE MODES:
WIDTH EXPANSION Word width may be increased simply by connecting the corresponding input control signals of multiple devices. Status flags (EF, FF and HF) can be detected from any one device. Figure 13 demonstrates an 18-bit word width by using two IDT7200/7201A/7202As. Any word width can be attained by adding additional IDT7200/7201A/7202As (Figure 13). BIDIRECTIONAL OPERATION Applications which require data buffering between two systems (each system capable of Read and Write operations) can be achieved by pairing IDT7200/7201A/7202As as shown in Figure 16. Both Depth Expansion and Width Expansion may be used in this mode. DATA FLOW-THROUGH Two types of flow-through modes are permitted, a read flow-through and write flow-through mode. For the read flow-through mode (Figure 17),
the FIFO permits a reading of a single word after writing one word of data into an empty FIFO. The data is enabled on the bus in (tWEF + tA) ns after the rising edge of W, called the first write edge, and it remains on the bus until the R line is raised from LOW-to-HIGH, after which the bus would go into a three-state mode after tRHZ ns. The EF line would have a pulse showing temporary deassertion and then would be asserted. In the write flow-through mode (Figure 18), the FIFO permits the writing of a single word of data immediately after reading one word of data from a full FIFO. The R line causes the FF to be deasserted but the W line being LOW causes it to be asserted again in anticipation of a new data word. On the rising edge of W, the new word is loaded in the FIFO. The W line must be toggled when FF is not asserted to write new data in the FIFO and to increment the write pointer. COMPOUND EXPANSION The two expansion techniques described above can be applied together in a straightforward manner to achieve large FIFO arrays (see Figure 15).
(HALF-FULL FLAG) WRITE (W) 9 DATA IN (D) FULL FLAG (FF) RESET (RS)
(HF) READ (R) IDT 7200/ 7201A/ 7202A 9 DATA OUT (Q) EMPTY FLAG (EF) RETRANSMIT (RT)
EXPANSION IN (XI)
Figure 12. Block Diagram of Single 256 x 9, 512 x 9, 1,024 x 9 FIFO
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HF 18 DATA IN (D) WRITE (W) FULL FLAG (FF) RESET (RS) IDT 7200/ 7201A/ 7202A 9 XI 9 9
HF
IDT 7200/ 7201A/ 7202A 9 XI 18
READ (R) EMPTY FLAG (EF) RETRANSMIT (RT)
DATA OUT (Q)
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Figure 13. Block Diagram of 256 x 18, 512 x 18, 1,024 x 18 FIFO Memory Used in Width Expansion Mode
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IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
TABLE 1 -- RESET AND RETRANSMIT
Single Device Configuration/Width Expansion Mode
Mode Reset Retransmit Read/Write
NOTE: 1. Pointer will increment if flag is HIGH.
RS 0 1 1
Inputs RT X 0 1
XI 0 0 0
Read Pointer Location Zero Location Zero Increment(1)
Internal Status Write Pointer Location Zero Unchanged Increment(1)
EF 0 X X
Outputs FF 1 X X
HF 1 X X
TABLE 2 -- RESET AND FIRST LOAD TRUTH TABLE
Depth Expansion/Compound Expansion Mode
Mode Reset First Device Reset All Other Devices Read/Write RS 0 0 1 Inputs FL 0 1 X XI (1) (1) (1) Read Pointer Location Zero Location Zero X Internal Status Write Pointer Location Zero Location Zero X Outputs EF 0 0 X FF 1 1 X
NOTE: 1. XI is connected to XO of previous device. See Figure 14. RS = Reset Input, FL/RT = First Load/Retransmit, EF = Empty Flag Output, FF = Full Flag Output, XI = Expansion Input, HF = Half-Full Flag Output
XO W D 9 FF 9 IDT 7200/ 7201A/ 7202A XI XO FULL 9 FF IDT 7200/ 7201A/ 7202A XI XO FF 9 RS IDT 7200/ 7201A/ 7202A XI EF EF EMPTY EF 9 FL R Q VCC
FL
FL
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Figure 14. Block Diagram of 768 x 9, 1,536 x 9, 3,072 x 9 FIFO Memory (Depth Expansion)
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IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
Q0-Q8 Q0-Q8 IDT7200/ IDT7201A/ IDT7202A DEPTH EXPANSION BLOCK D0-D8 D0-DN D9-DN
NOTES: 1. For depth expansion block see section on Depth Expansion and Figure 14. 2. For Flag detection see section on Width Expansion and Figure 13.
Q9-Q17 Q9-Q17 IDT7200/ IDT7201A/ IDT7202A DEPTH EXPANSION BLOCK D9-D17 D18-DN D(N-8)-DN
Q(N-8)-Qn Q(N-8)-Qn IDT7200/ IDT7201A/ IDT7202A DEPTH EXPANSION BLOCK D(N-8)-DN
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R, W, RS
Figure 15. Compound FIFO Expansion
WA FFA DA 0-8
IDT IDT 7200/ 7201A 7201A/ 7202A
RB EFB HFB QB 0-8
SYSTEM A
SYSTEM B
QA 0-8 RA HFA EFA
IDT 7200/ 7201A/ 7202A
DB 0-8 WB FFB
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Figure 16. Bidirectional FIFO Mode
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IDT7201L/7201LA/7202LA CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
DATA IN W tRPE R EF tWLZ DATA OUT tWEF tREF tA DATA
OUT VALID
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Figure 17. Read Data Flow-Through Mode
R W FF tRFF tWFF DATA IN tA DATA OUT DATA
OUT
tWPF
tDH
IN
DATA
VALID
tDS VALID
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Figure 18. Write Data Flow-Through Mode
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ORDERING INFORMATION
IDT XXXX Device Type X Power XXX Speed X Package X Process/ Temperature Range Blank I (1) B P TP D TD J SO L 12 15 20 25 30 35 50 80
(2)
Commercial (0oC to +70oC) Industrial (-40oC to +85oC) Military (-55oC to +125oC) Compliant to MIL-STD-883, Class B Plastic DIP Plastic Thin DIP CERDIP Thin CERDIP Plastic Leaded Chip Carrier SOIC Leadless Chip Carrier (7201 & 7202 Only) P28-1 P28-2 (7201 & 7202 Only) D28-1 D28-3 J32-1 SO28-3 L32-1 (7201 & 7202 Only)
PLCC LCC
Commercial Only Commercial and Industrial Commercial and Military Commercial and Industrial Military Only Commercial Only Commercial and (Military only for 7201) Military only for 7201
Access Time (tA) Speed in Nanoseconds
LA
Low Power
7200 7201 7202 7280 7281 7282
256 x 9-Bit FIFO 512 x 9-Bit FIFO 1,024 x 9-Bit FIFO 256 x 9-Bit DUAL FIFO 512 x 9-Bit DUAL FIFO 1,024 x 9-Bit DUAL FIFO
See 7280/7281/7282 data sheet for details
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NOTES: 1. Industrial temperature range product is available for the 15ns and 25ns as a standard product. 2. "A" to be included for IDT7201 and IDT7202 ordering part number.
DATASHEET DOCUMENT HISTORY
05/02/2001 pgs. 1, 2, 3, 4, 5 and 14. 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
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for TECH SUPPORT: 408-330-1753 e-mail: FIFOhelp@idt.com

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