Cypress CY7C1482V25, CY7C1486V25, CY7C1480V25 manual Truth Table for Read/Write, Function

CY7C1480V25

CY7C1482V25

CY7C1486V25

Truth Table for Read/Write

The read/write truth table for the CY7C1480V25 follows.[5]

Function	GW	BWE	BWD	BWC	BWB	BWA
Read	H	H	X	X	X	X
Read	H	L	H	H	H	H
Write Byte A – (DQA and DQPA)	H	L	H	H	H	L
Write Byte B – (DQB and DQPB)	H	L	H	H	L	H
Write Bytes B, A	H	L	H	H	L	L
Write Byte C – (DQC and DQPC)	H	L	H	L	H	H
Write Bytes C, A	H	L	H	L	H	L
Write Bytes C, B	H	L	H	L	L	H
Write Bytes C, B, A	H	L	H	L	L	L
Write Byte D – (DQD and DQPD)	H	L	L	H	H	H
Write Bytes D, A	H	L	L	H	H	L
Write Bytes D, B	H	L	L	H	L	H
Write Bytes D, B, A	H	L	L	H	L	L
Write Bytes D, C	H	L	L	L	H	H
Write Bytes D, C, A	H	L	L	L	H	L
Write Bytes D, C, B	H	L	L	L	L	H
Write All Bytes	H	L	L	L	L	L
Write All Bytes	L	X	X	X	X	X

Truth Table for Read/Write

The read/write truth table for the CY7C1482V25 follows.[5]

Function	GW	BWE	BW	B	BW	A
Read	H	H	X		X
Read	H	L	H		H
Write Byte A – (DQA and DQPA)	H	L	H		L
Write Byte B – (DQB and DQPB)	H	L	L		H
Write Bytes B, A	H	L	L		L
Write All Bytes	H	L	L		L
Write All Bytes	L	X	X		X

Truth Table for Read/Write

The read/write truth table for the CY7C1486V25 follows.[8]

Function	GW	BWE	BWX
Read	H	H			X
Read	H	L	All	BW		= H
Write Byte x – (DQx and DQPx)	H	L			L
Write All Bytes	H	L	All		BW	= L
Write All Bytes	L	X			X

Note

8.BWx represents any byte write signal BW[0..7]. To enable any byte write BWx, a Logic LOW signal must be applied at clock rise. Any number of byte writes can be enabled at the same time for any given write.

Document #: 38-05282 Rev. *H Page 11 of 32

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