CY7C421(2002) 查看數據表（PDF） - Cypress Semiconductor

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CY7C421
(Rev.:2002)

256/512/1K/2K/4K x 9 Asynchronous FIFO

Cypress Semiconductor 

Switching Waveforms (continued)

Last Write to First Read Full Flag

LAST WRITE

R

CY7C419/21/25/29/33

FIRST READ

ADDITIONAL

READS

FIRST WRITE

W

tWFF

FF

tRFF

Last Read to First Write Empty Flag

LAST READ

W

R

EF

DATA OUT

tREF

tA

VALID

FIRST WRITE

ADDITIONAL

WRITES

FIRST READ

tWEF

VALID

Retransmit[13]

FL/RT

tRTC[14]

tPRT

C420–12

C420–13

R,W

tRTR

C420–14

Notes:

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

14. tRTC = tPRT + tRTR.

Document #: 38-06001 Rev. *A

Page 9 of 22

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