
Switching Waveforms (continued)
Full Flag Timing
NO Write
WCLK
D0 –D8
tSKEW1 [15]
FF
tWFF
NO Write
tDS
CY7C4421/4201/4211/4221
CY7C4231/4241/4251
NO Write
tSKEW1 [15]
DATA Write
tWFF
tWFF
DATA Write
WEN1
WEN2
(if applicable)
RCLK
REN1,
REN2
tENS
tENH
OE
Q0 –Q8
LOW
tA
DATA IN OUTPUT REGISTER
Programmable Almost Empty Flag Timing
tCLKH
tCLKL
WCLK
WEN1
tENS tENH
WEN2
(if applicable)
PAE
RCLK
tENS tENH
tSKEW2 [22]
Note
23
tPAE
REN1,
REN2
tENS
tENH
DATA Read
tA
NEXT DATA Read
N + 1 WORDS
INFIFO
tENS
tENS tENH
Note
24
tPAE
Document #: 38-06016 Rev. *B
Page 11 of 18