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IDT7207L40SOG Datasheet(PDF) 9 Page - Integrated Device Technology |
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IDT7207L40SOG Datasheet(HTML) 9 Page - Integrated Device Technology |
9 / 14 page 9 COMMERCIAL,INDUSTRIALANDMILITARY TEMPERATURERANGES IDT7203/7204/7205/7206/7207/7208 CMOS ASYNCHRONOUS FIFO 2,048 x 9, 4,096 x 9, 8,192 x 9, 16,384 x 9, 32,768 x 9 and 65,536 x 9 APRIL 3, 2006 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 onthedevicewhere Risused).ForadditionalinformationontheIDT7203/7204/ 7205/7206/7207, 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 IDT7203/7204/7205/7206/7207/7208 may be used when the applicationrequirementsarefor2,048/4,096/8,192/16,384/32,768/65,536words 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 FIFOs can easily be adapted to applications when the require- ments are for greater than 2,048/4,096/8,192/16,384/32,768/65,536 words. Figure 14 demonstrates Depth Expansion using three IDT7203/7204/7205/ 7206/7207/7208s. Any depth can be attained by adding additional IDT7203/ 7204/7205/7206/7207/7208s. ThesedevicesoperateintheDepthExpansion mode when the following conditions are met: 1. ThefirstdevicemustbedesignatedbygroundingtheFirstLoad( FL)control input. 2. All other devices must have FLin the HIGH state. 3. The Expansion Out ( XO)pinofeachdevicemustbetiedtotheExpansion In ( XI) pin of the next device. See Figure 14. 4. External logic is needed to generate a composite Full Flag ( 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) function and Half-Full Flag (HF) are not available in the Depth Expansion Mode. For additional information on the IDT7203/7204/7205/7206/7207, refer to Tech Note 9: Cascading FIFOs or FIFO Modules. W R HF HALF-FULL OR LESS MORE THAN HALF-FULL HALF-FULL OR LESS tRHF tWHF 2661 drw11 W R XO WRITE TO LAST PHYSICAL LOCATION tXOL tXOH READ FROM LAST PHYSICAL LOCATION 2661 drw12 tXOH tXOL W R XI WRITE TO FIRST PHYSICAL LOCATION READ FROM FIRST PHYSICAL LOCATION tXI tXIR 2661 drw13 tXIS tXIS |
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