CY7C419/21/25/29/33
Switching Waveforms (continued)
Last Write to First Read Full Flag
ADDITIONAL
READS
LAST WRITE
R
FIRST READ
FIRST WRITE
W
t
t
RFF
WFF
FF
C420–12
Last Read to First Write Empty Flag
ADDITIONAL
WRITES
LAST READ
W
FIRST WRITE
FIRST READ
R
t
t
WEF
REF
EF
t
A
VALID
VALID
DATA OUT
C420–13
Retransmit[13]
[14]
RTC
t
t
PRT
FL/RT
R,W
t
RTR
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
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