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4.15MMCResponseRegisters(MMCRSP0-MMCRSP7)
Registers
Eachcommandhasapresetresponsetype.WhentheMMCcontrollerreceivesaresponse,itisstoredin
someoralloftheeightMMCresponseregisters(MMCRSP7-MMCRSP0).Theresponseregistersare
updatedastheresponsesarrive,eveniftheCPUhasnotreadthepreviouscontents.
AsshowninFigure33,Figure34,Figure35,andFigure36eachoftheMMCresponseregistersholdsup
to16bits.Table21andTable22showtheformatforeachtypeofresponseandwhichMMCresponse
registersareusedforthebitsoftheresponse.Thefirstbyteoftheresponseisacommandindexbyteand
isstoredintheMMCcommandindexregister(MMCCIDX).
Figure33.MMCResponseRegister0and1(MMCRSP01)
3116
MMCRSP1
R/W-0
150
MMCRSP0
R/W-0
LEGEND:R/W=Read/Write;-n=valueafterreset
Figure34.MMCResponseRegister2and3(MMCRSP23)
3116
MMCRSP3
R/W-0
150
MMCRSP2
R/W-0
LEGEND:R/W=Read/Write;-n=valueafterreset
Figure35.MMCResponseRegister4and5(MMCRSP45)
3116
MMCRSP5
R/W-0
150
MMCRSP4
R/W-0
LEGEND:R/W=Read/Write;-n=valueafterreset
Figure36.MMCResponseRegister6and7(MMCRSP67)
3116
MMCRSP7
R/W-0
150
MMCRSP6
R/W-0
LEGEND:R/W=Read/Write;-n=valueafterreset
SPRUE30B–September2006MultimediaCard(MMC)/SecureDigital(SD)CardController55
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