IS42S16402J datasheet(9/61 Pages) ISSI

Part #	IS42S16402J

Description	Internal bank for hiding row access/precharge

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Manufacturer	ISSI [Integrated Silicon Solution, Inc]

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Integrated Silicon Solution, Inc. — www.issi.com

9

Rev. A

12/06/2011

IS42S16402J

IS45S16402J

TRUTH TABLE – COMMANDS AND DQM OPERATION(1)

FUNCTION

CS

RAS

CAS

WE

DQM

ADDR

DQs

COMMANDINHIBIT(NOP)

H

X

NOOPERATION(NOP)

L

H

X

ACTIVE(Selectbankandactivaterow)(3)

L

H

X

Bank/Row

X

READ(Selectbank/column,startREADburst)(4)

L

H

L

H

L/H(8)

Bank/Col

X

WRITE(Selectbank/column,startWRITEburst)(4) L

H

L

L/H(8)

Bank/Col

Valid

BURSTTERMINATE

L

H

L

X

Active

PRECHARGE(Deactivaterowinbankorbanks)(5) L

L

H

L

X

Code

X

AUTOREFRESHorSELFREFRESH(6,7)

L

H

X

(Enterselfrefreshmode)

LOADMODEREGISTER(2)

L

X

Op-Code

X

WriteEnable/OutputEnable(8)

—

L

—

Active

WriteInhibit/OutputHigh-Z(8)

—

H

—

High-Z

NOTES:

1. CKEisHIGHforallcommandsexceptSELFREFRESH.

2. A0-A11definetheop-codewrittentothemoderegister.

3. A0-A11providerowaddress,andBA0,BA1determinewhichbankismadeactive.

4. A0-A7(x16)providecolumnaddress;A10HIGHenablestheautoprechargefeature(nonpersistent),whileA10LOWdisables

autoprecharge;BA0,BA1determinewhichbankisbeingreadfromorwrittento.

5. A10LOW:BA0,BA1determinethebankbeingprecharged.A10HIGH:AllbanksprechargedandBA0,BA1are“Don’tCare.”

6. AUTOREFRESHifCKEisHIGH,SELFREFRESHifCKEisLOW.

7. Internalrefreshcountercontrolsrowaddressing;allinputsandI/Osare“Don’tCare”exceptforCKE.

8. ActivatesordeactivatestheDQsduringWRITEs(zero-clockdelay)andREADs(two-clockdelay).

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