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Cypress CY7C1338G User Manual

Page 7

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CY7C1338G

Document #: 38-05521 Rev. *D

Page 7 of 17

Partial Truth Table for Read/Write

[2, 7]

Function

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

H

L

H

H

H

L

Write Byte B

H

L

H

H

L

H

Write Bytes B, A

H

L

H

H

L

L

Write Byte 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

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, B

H

L

L

L

H

H

Write Bytes D, B, A

H

L

L

L

H

L

Write Bytes D, C, A

H

L

L

L

L

H

Write All Bytes

H

L

L

L

L

L

Write All Bytes

L

X

X

X

X

X

Note:

7. 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.