CY7C421-20JXI 查看數據表（PDF） - Cypress Semiconductor

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CY7C421-20JXI

512 × 9 Asynchronous FIFO

Cypress Semiconductor 

Switching Waveforms (continued)

Figure 8. Last Write to First Read Full Flag

ADDITIONAL

LAST WRITE

FIRST READ

READS

FIRST WRITE

R

W

tWFF

FF

tRFF

W

R

EF

Q0–Q8

FL/RT

R,W

Figure 9. Last Read to First Write Empty Flag

LAST READ

FIRST WRITE

ADDITIONAL

WRITES

FIRST READ

tREF

tA

VALID

tWEF

Figure 10. Retransmit [11]

tRTC[12]

tPRT

VALID

tRTR

CY7C421

Notes

11. EF, HF and FF may change state during retransmit as a result of the offset of the read and write pointers, but flags are valid at tRTC.

12. tRTC = tPRT + tRTR.

Document Number: 38-06001 Rev. *H

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