Filter
Top Products
www.ti.com
Registers
Table18.MMCCommandRegister(MMCCMD)FieldDescriptions(continued)
BitFieldValueDescription
12STRMTPStreamenable.
0IfWDATX=1,thedatatransferisablocktransfer.Thedatatransferstopsafterthemovementofthe
programmednumberofbytes(definedbytheprogrammedblocksizeandtheprogrammednumberof
blocks).
1IfWDATX=1,thedatatransferisastreamtransfer.Oncethedatatransferisstarted,thedatatransfer
doesnotstopuntiltheMMCcontrollerissuesastopcommandtothememorycard.
11DTRWWriteenable.
0IfWDATX=1,thedatatransferisareadoperation.
1IfWDATX=1,thedatatransferisawriteoperation.
10-9RSPFMT0-3hResponseformat(expectedtypeofresponsetothecommand).
0Noresponse.
1hR1,R4,R5,orR6response.48bitswithCRC.
2hR2response.136bitswithCRC.
3hR3response.48bitswithnoCRC.
8BSYEXPBusyexpected.IfanR1b(R1withbusy)responseisexpected,setRSPFMT=1handBSYEXP=1.
0Abusysignalisnotexpected.
1Abusysignalisexpected.
7PPLENPushpullenable.
0PushpulldriverofCMDlineisdisabled(opendrain).
1PushpulldriverofCMDlineisenabled.
6Reserved0Reserved.
5-0CMD0-3FhCommandindex.Thisfieldcontainsthecommandindexforthecommandtobesenttothememory
card.
Figure31.CommandFormat
474645403924
StartTransmissionCommandindexArgument,highpart
238710
Argument,lowpartCRC7End
Table19.CommandFormat
BitPositionof
CommandRegisterDescription
47-Startbit
46-Transmissionbit
45-40MMCCMD(5-0)Commandindex(CMD)
39-24MMCARGHLArgument,highpart(ARGH)
23-8MMCARGHLArgument,lowpart(ARGL)
7-1-CRC7
0-Endbit
SPRUE30B–September2006MultimediaCard(MMC)/SecureDigital(SD)CardController53
SubmitDocumentationFeedback