Cypress CY7C1470BV25, CY7C1472BV25, CY7C1474BV25 - page 11

CY7C1470BV25
CY7C1472BV25, CY7C1474BV25
Document #: 001-15032 Rev. *D Page 11 of 29
Table 5. Partial Write Cycle Description
The partial write cycle description for CY7C1470BV25, CY7C1472BV25, and CY7C1474BV25 follows.[1, 2, 3, 8]
Function (CY7C1470BV25) 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 LL 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 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 BWbBWa
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 BWx
Read Hx
Write – No Bytes Written L H
Write Byte X − (DQx and DQPx) LL
Write All Bytes L All BW = L
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.
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