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CY7C1354CV25-166BZC Datasheet(PDF) 11 Page - Cypress Semiconductor |
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CY7C1354CV25-166BZC Datasheet(HTML) 11 Page - Cypress Semiconductor |
11 / 33 page CY7C1354CV25 CY7C1356CV25 Document Number: 38-05537 Rev. *M Page 11 of 33 Partial Truth Table for Read/Write The partial truth table for Read/Write for CY7C1354CV25 follows. [9, 10, 11, 12] Function (CY7C1354CV25) 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 L 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 LLL LL Partial Truth Table for Read/Write The partial truth table for Read/Write for CY7C1356CV25 follows. [9, 10, 11, 12] Function (CY7C1356CV25) WE BWb BWa 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 Notes 9. X = “Don’t Care”, H = Logic HIGH, L = Logic LOW, CE stands for all chip enables active. BWx = L signifies at least one byte write select is active, BWx = valid signifies that the desired byte write selects are asserted, see Write Cycle Description table for details. 10. Write is defined by WE and BWX. See Write Cycle Description table for details. 11. When a write cycle is detected, all I/Os are tri-stated, even during byte writes. 12. Table only lists a partial listing of the byte write combinations. Any combination of BWX is valid. Appropriate write will be done based on which byte write is active. |
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