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Cypress CY7C1380FV25 User Manual

Page 10

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CY7C1380DV25, CY7C1380FV25
CY7C1382DV25, CY7C1382FV25

Document #: 38-05546 Rev. *E

Page 10 of 29

Truth Table for Read/Write

[6, 9]

Function (CY7C1380DV25/CY7C1380FV25)

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

[6, 9]

Function (CY7C1382DV25/CY7C1382FV25)

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

Note:

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.

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