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4.16MMCDataResponseRegister(MMCDRSP)
4.17MMCCommandIndexRegister(MMCCIDX)
Registers
AftertheMMCcontrollersendsadatablocktoamemorycard,thereturnbytefromthememorycardis
storedintheMMCdataresponseregister(MMCDRSP).
TheMMCdataresponseregister(MMCDRSP)isshowninFigure37anddescribedinTable23.
Figure37.MMCDataResponseRegister(MMCDRSP)
3116
Reserved
R-0
15870
ReservedDRSP
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table23.MMCDataResponseRegister(MMCDRSP)FieldDescriptions
BitFieldValueDescription
31-8Reserved0Reserved
7-0DRSP0-FFhDuringawriteoperation(seeSection2.3.1),theCRCstatustokenisstoredinDRSP.
TheMMCcommandindexregister(MMCCIDX)storesthefirstbyteofaresponsefromamemorycard.
Table21andTable22showtheformatforeachtypeofresponse.
TheMMCcommandindexregister(MMCCIDX)isshowninFigure38anddescribedinTable24.
Figure38.MMCCommandIndexRegister(MMCCIDX)
3116
Reserved
R-0
1587650
ReservedSTRTXMITCIDX
R-0R/W-0R/W-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table24.MMCCommandIndexRegister(MMCCIDX)FieldDescriptions
BitFieldValueDescription
31-8Reserved0Reserved
7STRT0-1Startbit.WhentheMMCcontrollerreceivesaresponse,thestartbitisstoredinSTRT.
6XMIT0-1Transmissionbit.WhentheMMCcontrollerreceivesaresponse,thetransmissionbitisstoredinXMIT.
5-0CIDX0-3FhCommandindex.WhentheMMCcontrollerreceivesaresponse,thecommandindexisstoredinCIDX.
SPRUE30B–September2006MultimediaCard(MMC)/SecureDigital(SD)CardController57
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