Cypress CY7C1470V33, CY7C1472V33, CY7C1474V33 Partial Write Cycle Description

CY7C1470V33
CY7C1472V33
CY7C1474V33
Document #: 38-05289 Rev. *I Page 10 of 29
Partial Write Cycle Description[1, 2, 3, 8]
Function (CY7C1470V33) WE BWdBWcBWbBWa
Read H X X X X
Write – No bytes written L H H H H
Write Byte a – (DQa and DQPa) LHHHL
Write Byte b – (DQb and DQPb)LHHLH
Write Bytes b, a L H H L L
Write Byte c – (DQc and DQPc)LHLHH
Write Bytes c, a L H L H L
Write Bytes c, b L H L L H
Write Bytes c, b, a L H L L L
Write Byte d – (DQd and DQPd)LLHHH
Write Bytes d, a L L H H L
Write Bytes d, b LLHLH
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 (CY7C1472V33) WE BWbBWa
Read Hxx
Write – No Bytes Written L H H
Write Byte a – (DQa and DQPa)LHL
Write Byte b – (DQb and DQPb)LLH
Write Both Bytes L L L
Function (CY7C1474V33) WE BWx
Read Hx
Write – No Bytes Written L H
Write Byte X − (DQx and DQPx) LL
Write All Bytes LAll BW
= L
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.
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