Cypress Semiconductor CY7C1473BV33 Uživatelský manuál stáhnout pdf (Strana 11)

CY7C1471BV33

CY7C1473BV33

Document Number: 001-15029 Rev. *G Page 11 of 31

Truth Table for Read/Write

The read/write truth table for CY7C1471BV33/CY7C1473BV33 follows.

[8, 9, 10]

Function (CY7C1471BV33)

WE BW

Read H X X X X

Write – No bytes written L H H H H

Write byte A – (DQ

and DQP

)LLHHH

Write byte B – (DQ

and DQP

)LHLHH

Write byte C – (DQ

and DQP

)LHHLH

Write byte D – (DQ

and DQP

)LHHHL

Write all bytes LLLLL

Function (CY7C1473BV33)

WE BW

Read H X X

Write – No bytes written L H H

Write byte a – (DQ

and

DQP

)LLH

Write byte b – (DQ

and

DQP

)LHL

Write both bytes L L L

Notes

8. X = “Don't Care.” H = Logic HIGH, L = Logic LOW. BW

= L signifies at least one Byte Write Select is active, BW

= Valid signifies that the desired Byte Write Selects

are asserted, see section Truth Table for Read/Write on page 11 for details.

9. Write is defined by BW

, and WE. See section Truth Table for Read/Write on page 11.

10. Table only lists a partial listing of the byte write combinations. Any combination of BW

is valid. Appropriate write is based on which byte write is active.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 30 31

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