Cypress manual Partial Write Cycle Description, Function CY7C1470BV25, Function CY7C1472BV25

CY7C1470BV25

CY7C1472BV25, CY7C1474BV25

Table

5. Partial Write Cycle Description

The partial write cycle description for CY7C1470BV25, CY7C1472BV25, and CY7C1474BV25 follows.[1, 2, 3, 8]

Function (CY7C1470BV25)

WE

BW

d

BW

c

BW

b

BW

a

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 (CY7C1472BV25)

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 (CY7C1474BV25)

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

Document #: 001-15032 Rev. *D Page 11 of 29

[+] Feedback