Cypress manual Partial Write Cycle Description1, 2, 3, CY7C1470V25 CY7C1472V25 CY7C1474V25

CY7C1470V25

CY7C1472V25

CY7C1474V25

Partial Write Cycle Description[1, 2, 3, 8]

Function (CY7C1470V25)

WE

BWd

BWc

BWb

BWa

Read

H

X

X

X

X

Write – No bytes written

L

H

H

H

H

Write Byte a – (DQa and DQPa)

L

H

H

H

L

Write Byte b – (DQb and DQPb)

L

H

H

L

H

Write Bytes b, a

L

H

H

L

L

Write Byte c – (DQc and DQPc)

L

H

L

H

H

Write Bytes c, a

L

H

L

H

L

Write Bytes c, b

L

H

LL

L

H

Write Bytes c, b, a

L

H

L

L

L

Write Byte d – (DQd and DQPd)

L

L

H

H

H

Write Bytes d, a

L

L

H

H

L

Write Bytes d, b

L

L

H

L

H

Write Bytes d, b, a

L

L

H

L

L

Write Bytes d, c

L

L

L

H

H

Write Bytes d, c, a

L

L

L

H

L

Write Bytes d, c, b

L

L

L

L

H

Write All Bytes

L

L

L

L

L

Function (CY7C1472V25)

WE

BW

b

BW

a

Read

H

x

x

Write – No Bytes Written

L

H

H

Write Byte a – (DQa and DQPa)

L

H

L

Write Byte b – (DQb and DQPb)

L

L

H

Write Both Bytes

L

L

L

Function (CY7C1474V25)

WE

BW

x

Read

H

x

Write – No Bytes Written

L

H

Write Byte X − (DQx and DQPx)

L

L

Write All Bytes

L

All

= L

BW

Note:

8.Table only lists a partial listing of the Byte Write combinations. Any combination of BW[a:d] is valid. Appropriate Write will be done based on which Byte Write is active.

Document #: 38-05290 Rev. *I Page 9 of 28

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