SanDisk SDSDH-1024 Product Manual - Page 100

Revision 2.2 Chapter 5 - SPI Protocol SD Card Product Manual CMD SPI Index Mode Argument CMD13 Yes None CMD14 CMD15 CMD16 Reserved. No --- Yes [31:0] block length CMD17 Yes [31:0] data address CMD18 Yes [31:0] data address CMD19 CMD20 CMD21 ... CMD23 CMD24 Reserved. No --- Reserved. Yes [31:0] data address CMD25 Yes [31:0] data address CMD26 No CMD27 Yes --None CMD28 Yes [31:0] data address Resp Abbreviation SION R2 SEND_STATUS Description stop transmission during a multiple block read operation. Asks the selected card to send its Status Register. --- --- --- R1 SET_BLOCKLEN Selects a block length (in bytes) for all following block commands (read & write).1 R1 READ_SINGLE_ Reads a block of the BLOCK size selected by the SET_BLOCKLEN command.2 R1 READ_MULTIPLE_ Continuously BLOCK transfers data blocks from card to host until interrupted by a STOP_TRANSMISSI ON command. --- --- --- R1 WRITE_BLOCK Writes a block of the size selected by the SET_BLOCKLEN command.3 R1 WRITE_MULTIPLE Continuously writes _BLOCK blocks of data until a stop transmission token is sent (instead of 'start block'). --- --- --- R1 PROGRAM_CSD Programming of the programmable bits of the CSD. R1b SET_WRITE_ PROT If the card has write protection features, this command sets the write protection bit of the addressed group. The properties of write protection are coded in the card specific data 1 The default block length is as specified in the CSD Register. 2 The data transferred must not cross a physical block boundary unless READ_BLK_MISALIGN is set in the CSD Register. 3 The data transferred must not cross a physical block boundary unless WRITE_BLK_MISALIGN is set in the CSD Register. © 2004 SanDisk Corporation 5-10 12/08/04