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72V81L15PAGI8 Datasheet(PDF) 7 Page - Integrated Device Technology |
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72V81L15PAGI8 Datasheet(HTML) 7 Page - Integrated Device Technology |
7 / 12 page 7 IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO 512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9 COMMERCIAL ANDINDUSTRIAL TEMPERATURERANGES Figure 9. Half-Full Flag Timing Figure 10. Expansion Out Figure 11. Expansion In OPERATINGMODES: Caremustbetakentoassurethattheappropriateflagismonitoredbyeach system(i.e.FFismonitoredonthedevicewhere Wisused;EFismonitoredon the device where R is used). Single Device Mode A single IDT72V81/72V82/72V83/72V84/72V85 may be used when the applicationrequirementsarefor512/1,024/2,048/4,096/8,192wordsorless. TheseFIFOsareinaSingleDeviceConfigurationwhentheExpansionIn(XI) control input is grounded (see Figure 12). Depth Expansion Thesedevicescaneasilybeadaptedtoapplicationswhentherequirements are for greater than 512/1,024/2,048/4,096/8,192 words. Figure 14 demon- strates a four-FIFO Depth Expansion using two IDT72V81/72V82/72V83/ 72V84/72V85s. Any depth can be attained by adding additional IDT72V81/ 72V82/72V83/72V84/72V85s.TheseFIFOsoperateintheDepthExpansion mode when the following conditions are met: 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. W XI R WRITE TO FIRST PHYSICAL LOCATION READ FROM FIRST PHYSICAL LOCATION tXIS tXIR tXI tXIS 3966 drw 13 R W XO 3966 drw 12 WRITE TO LAST PHYSICAL LOCATION tXOL tXOH READ FROM LAST PHYSICAL LOCATION tXOL tXOH R W HF tRHF 3966 drw 11 HALF-FULL OR LESS MORE THAN HALF-FULL HALF-FULL OR LESS tWHF |
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