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IDT7284L12 Datasheet(PDF) 7 Page - Integrated Device Technology |
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IDT7284L12 Datasheet(HTML) 7 Page - Integrated Device Technology |
7 / 12 page 7 COMMERCIALTEMPERATURERANGE IDT7280/7281/7282/7283/7284/7285 5V ASYNCHRONOUS FIFO DUAL 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 Figure 9. Half-Full Flag Timing Figure 10. Expansion Out Figure 11. Expansion In OPERATING MODES: Care must be taken to assure that the appropriate flag is monitored by eachsystem(i.e. FFismonitoredonthedevicewhereWisused;EFismonitored on the device where R is used). SINGLE DEVICE MODE A single IDT7280/7281/7282/7283/7284/7285 may be used when the application requirements are for 256/512/1,024/2,048/4,096/8,192 words or less. These FIFOs are in a Single Device Configuration when the Expansion In ( XI) control input is grounded (see Figure 12). DEPTH EXPANSION These devices can easily be adapted to applications when the require- ments are for greater than 256/512/1,024/2,048/4,096/8,192 words. Figure 14 demonstrates a four-FIFO Depth Expansion using two IDT7280/7281/ 7282/7283/7284/7285s. Any depth can be attained by adding additional IDT7280/7281/7282/7283/7284/7285s. These FIFOs operate in the Depth Expansion mode when the following conditions are met: 1. ThefirstFIFOmustbedesignatedbygroundingtheFirstLoad( FL)control input. 2. All other FIFOs must have FLin the HIGH state. 3. The Expansion Out ( XO)pinofeachdevicemustbetiedtotheExpansion In ( XI) pin of the next device. See Figure 14. 4. ExternallogicisneededtogenerateacompositeFullFlag( FF)andEmpty 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 FFor EF). See Figure 14. 5. The Retransmit ( RT)functionandHalf-FullFlag(HF)arenotavailablein the Depth Expansion Mode. R W HF tRHF 3208 drw 11 HALF-FULL OR LESS MORE THAN HALF-FULL HALF-FULL OR LESS tWHF R W XO 3208 drw 12 WRITE TO LAST PHYSICAL LOCATION tXOL tXOH READ FROM LAST PHYSICAL LOCATION tXOL tXOH W XI R 3208 drw 13 WRITE TO FIRST PHYSICAL LOCATION READ FROM FIRST PHYSICAL LOCATION tXIS tXIR tXI tXIS |
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