48SD1616 datasheet(13/42 Pages) MAXWELL

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48SD1616

All data sheets are subject to change without notice

256Mb (4-Meg X 16-Bit X 4-Banks) SDRAM

01.07.05 REV 4

Function Truth Table

The following function table shows the operations that are performed when each command is issued in each

mode of the SDRAM.

The following table assumes that CKE is High.

CURRENT STATE

RAS

CAS

ADDRESS

COMMAND

OPERATION

Precharge

DESL

Enter IDLE after t

NOP

Enter IDLE after t

BA, CA, A10

READ/READ A

ILLEGAL1

BA, CA, A10

WRIT/WRIT A

ILLEGAL1

BA, RA

ACTV

ILLEGAL1

BA, A10

PRE, PALL

NOP2

REF, SELF

ILLEGAL

MODE

MRS

ILLEGAL

Idle

DESL

NOP

BA, CA, A10

READ/READ A

ILLEGAL3

BA, CA, A10

WRIT/WRIT A

ILLEGAL3

BA, RA

ACTV

Bank and row active

BA, A10

PRE, PALL

NOP

REF, SELF

Refresh

MODE

MRS

Mode register set

Row active

DESL

NOP

BA, CA, A10

READ/READ A

Begin read

BA, CA, A10

WRIT/WRIT A

Begin write

BA, RA

ACTV

Other bank active

ILLEGAL on same bank4

BA, A10

PRE, PALL

Precharge

REF, SELF

ILLEGAL

MODE

MRS

ILLEGAL

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