CY7C1471V25
CY7C1473V25
CY7C1475V25
Document #: 38-05287 Rev. *I
Page 12 of 32
Truth Table for Read/Write
The read-write truth table for CY7C1471V25 follows.
[2, 3, 9]
Function
WE
BW
A
BW
B
BW
C
BW
D
Read
H
X
X
X
X
Write No bytes written
L
H
H
H
H
Write Byte A – (DQ
A
and DQP
A
)
L
L
H
H
H
Write Byte B – (DQ
B
and DQP
B
)
L
H
L
H
H
Write Byte C – (DQ
C
and DQP
C
)
L
H
H
L
H
Write Byte D – (DQ
D
and DQP
D
)
L
H
H
H
L
Write All Bytes
L
L
L
L
L
Truth Table for Read/Write
The read-write truth table for CY7C1473V25 follows.
[2, 3, 9]
Function
WE
BW
b
BW
a
Read
H
X
X
Write – No Bytes Written
L
H
H
Write Byte a – (DQ
a
and
DQP
a
)
L
H
L
Write Byte b – (DQ
b
and
DQP
b
)
L
L
H
Write Both Bytes
L
L
L
Truth Table for Read/Write
The read-write truth table for CY7C1475V25 follows.
[2, 3, 9]
Function
WE
BW
x
Read
H
X
Write – No Bytes Written
L
H
Write Byte X
−
(DQ
x
and
DQP
x)
L
L
Write All Bytes
L
All BW = L
Note
9. Table lists only a partial listing of the byte write combinations. Any combination of BW
X
is valid. Appropriate write is based on which byte write is active.
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