CY7C421 CYPRESS [Cypress Semiconductor], CY7C421 Datasheet - Page 10

• Manufacturer Part Number: CY7C421
• Manufacturer: CYPRESS [Cypress Semiconductor]

Switching Waveforms (continued)
Document Number: 38-06001 Rev. *H
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 t
12. t
RTC
= t
FL/RT
Q0–Q8
R,W
PRT
EF
FF
W
W
R
R
+ t
RTR
.
t
t
REF
WFF
LAST WRITE
t
LAST READ
A
VALID
Figure 9. Last Read to First Write Empty Flag
t
Figure 8. Last Write to First Read Full Flag
PRT
t
RTC
[12]
FIRST WRITE
Figure 10. Retransmit
FIRST READ
t
t
WEF
RFF
t
RTR
ADDITIONAL
ADDITIONAL
WRITES
READS
[11]
FIRST WRITE
FIRST READ
VALID
RTC
.
CY7C421
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