Cypress CY7C1440AV33 manual Truth Table for Read/Write4,8,9, Truth Table for Read/Write4, 8

CY7C1440AV33

CY7C1442AV33

CY7C1446AV33

Truth Table (continued)[2, 3, 4, 5, 6, 7]

Operation

Add. Used

CE1

CE2

CE3

ZZ

ADSP

ADSC

ADV

WRITE

OE

CLK

DQ

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 for Read/Write[4,8,9]

Function (CY7C1440AV33)	GW	BWE	BWD	BWC	BWB	BWA
Read	H	H	X	X	X	X
Read	H	L	H	H	H	H
Write Byte A – (DQA and DQPA)	H	L	H	H	H	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	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 – (DQD and DQPD)	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	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.

Document #: 38-05383 Rev. *E Page 10 of 31

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