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CY7C1484V33
CY7C1485V33
Document #: 38-05285 Rev. *G
Page 9 of 26
Truth Table for Read/Write
The following is the Truth Table for Read/Write for the CY7C1484V33/CY7C1485V33/.[5, 8]
Function (CY7C1484V33)
GW
BWE
BWD
BWC
BWB
BWA
Read
H
H
XXXX
Read
H
L
HHHH
Write Byte A – (DQA and DQPA)
H
L
HHH
L
Write Byte B – (DQB and DQPB)H
L
H
H
L
H
Write Bytes B, A
H
L
H
H
L
L
Write Byte C – (DQC and DQPC)
H
LH
LH
H
Write Bytes C, A
H
L
H
L
H
L
Write Bytes C, B
H
L
H
L
L
H
Write Bytes C, B, A
H
L
H
L
L
L
Write Byte D – (DQD and DQPD)
H
L
L
HHH
Write Bytes D, A
H
L
L
H
H
L
Write Bytes D, B
H
L
L
H
L
H
Write Bytes D, B, A
H
L
L
H
L
L
Write Bytes D, C
H
L
L
L
H
H
Write Bytes D, C, A
H
L
L
L
H
L
Write Bytes D, C, B
H
LLLL
H
Write All Bytes
H
LLLLL
Write All Bytes
L
XXXXX
Function (CY7C1485V33)
GW
BWE
BWB
BWA
Read
HH
X
X
Read
HL
H
H
Write Byte A – (DQA and DQPA)H
L
H
L
Write Byte B – (DQB and DQPB)H
L
L
H
Write All Bytes
H
L
L
L
Write All Bytes
L
X
X
X
Note
8. Table lists only a partial listing of the byte write combinations. Any combination of BWX is valid. Appropriate write will be done based on which byte write is active.
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