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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 BW
D
BW
C
BW
B
BW
A
Read HHXXXX
Read HLHHHH
Write Byte A – (DQ
A
and DQP
A
) HLHHHL
Write Byte B – (DQ
B
and DQP
B
)HLHHLH
Write Bytes B, A H L H H L L
Write Byte C – (DQ
C
and DQP
C
) HLHLHH
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 – (DQ
D
and DQP
D
) HL LHHH
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 HLLLLH
Write All Bytes HLLLLL
Write All Bytes LXXXXX
Truth Table for Read/Write
The read/write truth table for the CY7C1482V25 follows.
[5]
Function
GW
BWE BW
B
BW
A
Read H H X X
Read H L H H
Write Byte A – (DQ
A
and DQP
A
)HLHL
Write Byte B – (DQ
B
and DQP
B
)HLLH
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 BW
X
Read HHX
Read H L All BW
= H
Write Byte x – (DQ
x and DQPx)HLL
Write All Bytes H L All BW
= L
Write All Bytes L X X
Note
8. BW
x 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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