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4.8MMCBlockLengthRegister(MMCBLEN)
Registers
TheMMCblocklengthregister(MMCBLEN)specifiesthedatablocklengthinbytes.Thisvaluemust
matchtheblocklengthsettinginthememorycard.
TheMMCblocklengthregister(MMCBLEN)isshowninFigure25anddescribedinTable13.
Figure25.MMCBlockLengthRegister(MMCBLEN)
3116
Reserved
R-0
1512110
ReservedBLEN
R-0R/W-200h
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table13.MMCBlockLengthRegister(MMCBLEN)FieldDescriptions
BitFieldValueDescription
31-12Reserved0Reserved
11–0BLEN1h–FFFhBlocklength.Thisfieldisusedtosettheblocklength,whichisthebytecountofadatablock.The
value0isprohibited.
Note:TheBLENbitsvaluemustbethesameastheCSDregistersettingsintheMMC/SDcard.
Tobeprecise,itshouldmatchthevalueoftheREAD_BL_LENfieldforread,or
WRITE_BL_LENfieldforwrite.
SPRUE30B–September2006MultimediaCard(MMC)/SecureDigital(SD)CardController49
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