MultiMediaCard Protocol - USB Mass Storage: Designing and Programming Devices and Embedded Hosts - page 110

A table in ROM holds additional information about the commands. For
each command, the table below stores a command name, CRC value,
response type, and whether or not the command is followed by more data.
Firmware can identify an entry in the table by specifying a command from
the enumeration above. For example, SEND_CSD is the third enumeration
constant in the enumeration, and cmdSEND_CSD is the third entry in the
table.
#define MOREDATA !0
#define NODATA 0

const rom typSDC_CMD sdmmc_cmdtable[] =
{
// command name CRC response type more data?

{cmdGO_IDLE_STATE, 0x95, R1, NODATA},

{cmdSEND_OP_COND, 0xF9, R1, NODATA},

{cmdSEND_CSD, 0xAF, R1, MOREDATA},

{cmdSEND_CID, 0x1B, R1, MOREDATA},

{cmdSTOP_TRANSMISSION, 0xC3, R1, NODATA},

{cmdSEND_STATUS, 0xAF, R2, NODATA},

{cmdSET_BLOCKLEN, 0xFF, R1, NODATA},

{cmdREAD_SINGLE_BLOCK, 0xFF, R1, MOREDATA},

{cmdREAD_MULTI_BLOCK, 0xFF, R1, MOREDATA},

{cmdWRITE_SINGLE_BLOCK, 0xFF, R1, MOREDATA},

{cmdWRITE_MULTI_BLOCK, 0xFF, R1, MOREDATA},

{cmdTAG_SECTOR_START, 0xFF, R1, NODATA},

{cmdTAG_SECTOR_END, 0xFF, R1, NODATA},

{cmdUNTAG_SECTOR, 0xFF, R1, NODATA},

{cmdTAG_ERASE_GRP_START, 0xFF, R1, NODATA},

{cmdTAG_ERASE_GRP_END, 0xFF, R1, NODATA},

{cmdUNTAG_ERASE_GRP, 0xFF, R1, NODATA},

{cmdERASE, 0xDF, R1b, NODATA},

{cmdLOCK_UNLOCK, 0x89, R1b, NODATA},

{cmdSD_APP_OP_COND, 0xE5, R1, NODATA},

{cmdAPP_CMD, 0x73, R1, NODATA},

{cmdREAD_OCR, 0x25, R3, NODATA},

{cmdCRC_ON_OFF, 0x25, R1, NODATA}

};