CY7C4421/4201/4211/4221
CY7C4231/4241/4251
Switching Waveforms (continued)
Full Flag Timing
NO Write
NO Write
NO Write
WCLK
[14]
[14]
t
t
DS
DATA Write
t
t
SKEW1
SKEW1
DATA Write
D –D
0
8
t
t
WFF
WFF
WFF
FF
WEN1
WEN2
(if applicable)
RCLK
t
t
ENH
ENH
t
t
ENS
ENS
REN1,
REN2
LOW
OE
t
A
t
A
DATA Read
NEXT DATA Read
DATA IN OUTPUT REGISTER
Q –Q
0
8
Programmable Almost Empty Flag Timing
t
t
CLKL
CLKH
WCLK
WEN1
t
t
ENS
ENH
WEN2
(if applicable)
t
t
ENS
[21]
ENH
Note
22
PAE
N + 1 WORDS
INFIFO
Note
23
t
PAE
t
t
PAE
SKEW2
RCLK
t
ENS
t
t
ENH
ENS
REN1,
REN2
Document #: 38-06016 Rev. *A
Page 11 of 18