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IDT72V205 Datasheet(PDF) 20 Page - Integrated Device Technology |
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IDT72V205 Datasheet(HTML) 20 Page - Integrated Device Technology |
20 / 25 page 20 IDT72V205/72V215/72V225/72V235/72V245 3.3V CMOS SyncFIFOTM 256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18 and 4,096 x 18 COMMERCIALANDINDUSTRIAL TEMPERATURERANGES Figure 25. Write Cycle Timing with Double Register-Buffered FF (IDT Standard Mode) NOTES: 1. tSKEW1 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that FF will go HIGH after one WCLK cycle plus tWFF. If the time between the rising edge of RCLK and the rising edge of WCLK is less than tSKEW1, then the FF deassertion time may be delayed an extra WCLK cycle. 2. LD = HIGH. 3. Select this mode by setting ( FL, RXI, WXI) = (0,1,0) or (1,1,0) during Reset. Figure 24. Double Register-Buffered Full Flag Timing (IDT Standard Mode) NOTES: 1. tSKEW1 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that FF will go HIGH after one WCLK cycle plus tRFF. If the time between the rising edge of RCLK and the rising edge of WCLK is less than tSKEW1. then the FF deassertion may be delayed an extra WCLK cycle. 2. LD = HIGH. 3. Select this mode by setting ( FL, RXI, WXI) = (0,1,0) or (1,1,0) during Reset. WCLK D0 - D17 WEN FF RCLK REN tDS tWFF tWFF DATA IN VALID NO OPERATION (1) tSKEW1 4294 drw 25 tENS tDH tENH 1 2 tCLKH tCLKL tCLK D0 - D17 WEN RCLK FF REN tENH tENH Q0 - Q17 DATA READ NEXT DATA READ DATA IN OUTPUT REGISTER LOW OE tSKEW1 DATA WRITE 4294 drw 24 WCLK NO WRITE 1 2 1 2 tDS NO WRITE tWFF tWFF tWFF tA tENS tENS tSKEW1 tDS tA Wd (1) (1) |
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