SanDisk SD Card

More documents

Recommendations

Info

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
Revision 2.2Chapter 4 – SD Card Protocol DescriptionSanDisk SD Card Product ManualCMD Index Type Argument Resp. Abbreviation Description(representing 32 writeprotectgroups starting atthe specified address)followed by 16 CRC bitsare transferred in apayload format via thedata line. The last (leastsignificant) bit of theprotection bitscorresponds to the firstaddressed group. If theaddresses of the lastgroups are outside thevalid range, then thecorresponding writeprotectionbits shall beset to zero.CMD31ReservedErase Commands (Class 5)CMD32 ac [31:0] dataaddressCMD33 ac [31:0] dataaddressCMD38 ac [31:0] don’tcareCMD39ReservedR1 ERASE_WR_BLK_START Sets the address of thefirst write block to beerased.R1 ERASE_WR_BLK_END Sets the address of thelast write block of thecontinuous range to beerased.R1b ERASE Erases all previouslyselected write blocks.CMD40 --- --- --- --- Not valid in SD MemoryCard -Reserved forMultiMediaCard I/Omode.CMD41ReservedI/O Mode Commands (Class 9)CMD39CMD40CMD41MMCA Optional Command, currently not supported.ReservedLock Card Commands (Class 7)CMD16 ac [31:] blocklengthCMD42 adtc [31:0] stuffbitsR1 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 LOCK_UNLOCK Used to set/reset thepassword or lock/unlockthe card. The size of thedata block is set by theSET_BLOCK_LENcommand.© 2004 SanDisk Corporation 4-35 12/08/04
Page 4 and 5:
Revision 2.2SanDisk SD Card Product
Page 6 and 7:
Revision 2.2Chapter 1 - Introductio
Page 8 and 9:
Page 10 and 11:
Page 12 and 13:
Page 14 and 15:
Page 16 and 17:
Revision 2.2Chapter 2 - Product Spe
Page 18 and 19:
Page 20 and 21:
Page 22 and 23:
Revision 2.2Chapter 3 - SD Card Int
Page 24 and 25:
Page 26 and 27:
Page 28 and 29: Revision 2.2Chapter 3 - SD Card Int
Page 46 and 47: Revision 2.2Chapter 4 - SD Card Pro
Page 92 and 93: Revision 2.2Chapter 5 - SPI Protoco
Page 112 and 113: Revision 2.2Appendix B -SanDisk Wor
Page 114 and 115: Revision 2.2Appendix C -Limited War
Page 116 and 117: Revision 2.2Appendix D -Disclaimer
Page 118 and 119: Host Design Considerations:Applicat
show all

SanDisk SD Card

Create successful ePaper yourself

Delete template?

Save as template?