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7284L12PAIGI Datasheet(PDF) 7 Page - Integrated Device Technology |
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7284L12PAIGI 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 JUNE 29, 2012 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 applicationrequirementsarefor256/512/1,024/2,048/4,096/8,192wordsor less. TheseFIFOsareinaSingleDeviceConfigurationwhentheExpansion 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 Expansionmodewhenthefollowingconditionsaremet: 1. ThefirstFIFOmustbedesignatedbygroundingtheFirstLoad(FL)control input. 2. All other FIFOs must have FLin the HIGH state. 3. TheExpansionOut(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. TheRetransmit(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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