CY7C1381DV25, CY7C1381FV25
CY7C1383DV25, CY7C1383FV25
Document #: 38-05547 Rev. *E
Page 10 of 28
Truth Table for Read/Write [4, 9]
Function (CY7C1381DV25/CY7C1381FV25)
GW
BWE
BWD
BWC
BWB
BWA
Read
H
H
X
X
X
X
Read
H
L
H
H
H
H
Write Byte A (DQA, DQPA)H
L
H
H
H
L
Write Byte B (DQB, DQPB)H
L
H
H
L
H
Write Bytes A, B (DQA, DQB, DQPA, DQPB)H
L
H
H
L
L
Write Byte C (DQC, DQPC)
H
LHLH
H
Write Bytes C, A (DQC, DQA, DQPC, DQPA)
H
LHLH
L
Write Bytes C, B (DQC, DQB, DQPC, DQPB)H
L
H
L
L
H
Write Bytes C, B, A (DQC, DQB, DQA, DQPC,
DQPB, DQPA)
HL
H
L
L
L
Write Byte D (DQD, DQPD)H
L
L
H
H
H
Write Bytes D, A (DQD, DQA, DQPD, DQPA)H
L
L
H
H
L
Write Bytes D, B (DQD, DQA, DQPD, DQPA)H
L
L
H
L
H
Write Bytes D, B, A (DQD, DQB, DQA, DQPD,
DQPB, DQPA)
HL
L
H
L
L
Write Bytes D, B (DQD, DQB, DQPD, DQPB)H
L
L
L
H
H
Write Bytes D, B, A (DQD, DQC, DQA, DQPD,
DQPC, DQPA)
HL
L
L
H
L
Write Bytes D, C, A (DQD, DQB, DQA, DQPD,
DQPB, DQPA)
HL
L
L
L
H
Write All Bytes
H
L
L
L
L
L
Write All Bytes
L
X
X
X
X
X
Truth Table for Read/Write [4, 9]
Function (CY7C1383DV25/CY7C1383FV25)
GW
BWE
BWB
BWA
Read
H
H
X
X
Read
H
L
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
9. Table only lists 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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