Texas Instruments TMS320C6745 DSP - SD Card Identification Procedure

Command
GO_IDLE_STATE
APP_CMD
Command
CardstatusinR1
Response
SDcontroller
registerregistercontent
SDcontroller
Identifycardbyrequestingall
cardstosendtheirCIDandfor
thesuccessfulcardthatsends
itCID,requestitsRCA.
ContinuetheCIDrequestand
RCA untilallcardsareidentified.
Whentherearenomorecardsto
beidentified,therewillbeno
responseandatimeoutwillbe
usedtosignifytheendoftheSD
identificationprocess.
SD_APP_OP_COND
Command
Response
OCRinR3
SEND_RELATIVE_ADDR
CMD3RCA inR6
Response
Command
CMD2CIDinR2
ALL_SEND_CID
Response
Command
Procedures for Common Operations www.ti.com
1114
SPRUH91D–March 2013–Revised September 2016
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Multimedia Card (MMC)/Secure Digital (SD) Card Controller
6. Repeat Step 4 and Step 5 to identify and retrieve relative addresses from all remaining SD cards until
no card responds to the CMD2 command. No card responding within 5 memory clock cycles indicates
that all cards have been identified and the MMC card and the identification procedure terminates.
The sequence of events in this operation is shown in Figure 25-12.
Figure 25-12. SD Card Identification Procedure