SanDisk SD Card

Revision 2.2Chapter 4 – SD Card Protocol DescriptionSanDisk SD Card Product ManualCMD Index Type Argument Resp. Abbreviation DescriptionCSD.CMD17 adtc [31:0] dataaddressCMD18 adtc [31:0] dataaddressCMD19 …CMD23ReservedBlock Write Commands (Class 4)CMD16 ac [31:0] blocklengthCMD24 adtc [31:0] dataaddressCMD25 adtc [31:0] dataaddressCMD26Reserved for manufacturerCMD27 adtc [31:0] stuffbitsWrite Protection Commands (Class 6)R1 READ_SINGLE_BLOCK Reads a block of thesize selected by theSET_BLOCKLENcommand. 24R1 READ_MULTIPLE_BLOCK Sends blocks of datacontinuously untilinterrupted by a stoptransmission command.R1 SET_BLOCKLEN Sets the block length (inbytes) for all followingblock commands (read,write, lock). Defaultblock length is specifiedin the CSD. Supportedonly if Partial blockRD/WR operation areallowed in CSD.R1 WRITE_BLOCK Writes a block of thesize selected by theSET_BLOCKLENcommand 25R1 WRITE_MULTIPLE_BLOCK Writes blocks of datacontinuously until aSTOP_TRANSMISSIONcommand is received.R1 PROGRAM_CSD Programs theprogrammable bits of theCSD.CMD28 ac [31:0] dataaddressCMD29 ac [31:0] dataaddressCMD30 adtc [31:0]writeprotectdataaddressR1b SET_WRITE_PROT If card supports thisfeature, it sets the writeprotection bit of theaddressed group. Theproperties of writeprotection are coded inthe card-specific data(WP_GRP_SIZE).R1b CLR_WRITE_PROT If card supports thisfeature, it clears thewrite protection bit of theaddressed.R1 SEND_WRITE_PROT If card supports thisfeature, it asks the cardto send the status of thewrite protection.32 write-protection bits24 The data transferred must not cross a physical block boundary unless READ_BLK_MISALIGN is set in theCSD Register.25 The data transferred must not cross a physical block boundary unless WRITE_BLK_MISALIGN is set in theCSD. In case that write partial blocks is not supported then the block length=default block length (given in CSD).© 2004 SanDisk Corporation 4-34 12/08/04