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CY7C1370D-250AXC Datasheet(PDF) 11 Page - Cypress Semiconductor |
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CY7C1370D-250AXC Datasheet(HTML) 11 Page - Cypress Semiconductor |
11 / 33 page CY7C1370D, CY7C1372D Document Number: 38-05555 Rev. *L Page 11 of 33 Partial Write Cycle Description The Partial Write Cycle Description follows. [8, 9, 10, 11] Function (CY7C1370D) 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 LHLH Write Bytes d, b, a L L H L L Write Bytes d, c LLL 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 (CY7C1372D) 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 8. 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. 9. Write is defined by WE and BWX. See Write Cycle Description table for details. 10. When a write cycle is detected, all I/Os are tristated, even during byte writes. 11. 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. [+] Feedback |
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