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CY7C1480V25
CY7C1482V25
CY7C1486V25
Document #: 38-05282 Rev. *H
Page 11 of 32
Truth Table for Read/Write
The read/write truth table for the CY7C1480V25 follows.[5]
Function
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
Truth Table for Read/Write
The read/write truth table for the CY7C1482V25 follows.[5]
Function
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 Bytes B, A
H
L
L
L
Write All Bytes
H
L
L
L
Write All Bytes
L
X
X
X
Truth Table for Read/Write
The read/write truth table for the CY7C1486V25 follows.[8]
Function
GW
BWE
BWX
Read
HH
X
Read
H
L
All BW = H
Write Byte x – (DQx and DQPx)H
L
L
Write All Bytes
H
L
All BW = L
Write All Bytes
L
X
X
Note
8. BWx represents any byte write signal BW[0..7]. To enable any byte write BWx, a Logic LOW signal must be applied at clock rise. Any number of byte writes can
be enabled at the same time for any given write.
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