CY7C1440AV33
CY7C1442AV33
CY7C1446AV33
Document #: 38-05383 Rev. *E
Page 10 of 31
READ Cycle, Suspend Burst
Current
X
X
X
L
H
H
H
H
H
L-H
Tri-State
READ Cycle, Suspend Burst
Current
H
X
X
L
X
H
H
H
L
L-H
Q
READ Cycle, Suspend Burst
Current
H
X
X
L
X
H
H
H
H
L-H
Tri-State
WRITE Cycle, Suspend Burst
Current
X
X
X
L
H
H
H
L
X
L-H
D
WRITE Cycle, Suspend Burst
Current
H
X
X
L
X
H
H
L
X
L-H
D
Truth Table (continued)[2, 3, 4, 5, 6, 7]
Operation
Add. Used
CE1 CE2 CE3 ZZ ADSP ADSC ADV WRITE OE CLK
DQ
Truth Table for Read/Write[4,8,9]
Function (CY7C1440AV33)
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[4, 8, 9]
Function (CY7C1442AV33)
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
Notes:
8. BWx represents any byte write signal. To enable any byte write BWx, a Logic LOW signal should be applied at clock rise.Any number of bye writes can be enabled
at the same time for any given write.
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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