Cypress CY7C1446AV33 User Manual
Page 10
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
CE
1
CE
2
CE
3
ZZ
ADSP
ADSC
ADV
WRITE
OE CLK
DQ
Truth Table for Read/Write
[4,8,9]
Function (CY7C1440AV33)
GW
BWE
BW
D
BW
C
BW
B
BW
A
Read
H
H
X
X
X
X
Read
H
L
H
H
H
H
Write Byte A – (DQ
A
and DQP
A
)
H
L
H
H
H
L
Write Byte B – (DQ
B
and DQP
B
)
H
L
H
H
L
H
Write Bytes B, A
H
L
H
H
L
L
Write Byte C – (DQ
C
and DQP
C
)
H
L
H
L
H
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 – (DQ
D
and DQP
D
)
H
L
L
H
H
H
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
L
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, 8, 9]
Function (CY7C1442AV33)
GW
BWE
BW
B
BW
A
Read
H
H
X
X
Read
H
L
H
H
Write Byte A – (DQ
A
and DQP
A
)
H
L
H
L
Write Byte B – (DQ
B
and DQP
B
)
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. BW
x
represents any byte write signal. To enable any byte write BW
x
, 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 BW
X
is valid. Appropriate write will be done based on which byte write is active.