- Generated on Mon Oct 20 2025 13:02:33 by
1.9.1
CSD register structure Version 2.0 and Version 3.0. More...
CSD register structure Version 2.0 and Version 3.0.
A combined format is used for CSD Version 2.0 and 3.0 to reduce the code size. The only difference is the bit length of C_SIZE.
#include <sdmmc.h>
Data Fields | |
| uint32_t | CSD_CRC:8 |
| CRC including End bit 1b [7:0]. | |
| uint32_t | reserved5:1 |
| reserved [8] | |
| uint32_t | WP_UPC:1 |
| write protection until power cycle [9] | |
| uint32_t | FILE_FORMAT:2 |
| File format [11:10]. | |
| uint32_t | TMP_WRITE_PROTECT:1 |
| temporary write protection [12] | |
| uint32_t | PERM_WRITE_PROTECT:1 |
| permanent write protection [13] | |
| uint32_t | COPY:1 |
| copy flag [14] | |
| uint32_t | FILE_FORMAT_GRP:1 |
| File format group [15]. | |
| uint32_t | reserved4:5 |
| reserved [20:16] | |
| uint32_t | WRITE_BL_PARTIAL:1 |
| partial blocks for write allowed [21] | |
| uint32_t | WRITE_BL_LEN:4 |
| max. More... | |
| uint32_t | R2W_FACTOR:3 |
| write speed factor [28:26] | |
| uint32_t | reserved3:2 |
| reserved [30:29] | |
| uint32_t | WP_GRP_ENABLE:1 |
| write protect group enable [31] | |
| uint32_t | WP_GRP_SIZE:7 |
| write protect group size [38:32] | |
| uint32_t | SECTOR_SIZE:7 |
| erase sector size [45:39] | |
| uint32_t | ERASE_BLK_EN:1 |
| erase single block enable [46] | |
| uint32_t | reserved2:1 |
| reserved [47] | |
| uint32_t | C_SIZE:28 |
| device size v2.0 [69:48], v3.0 [75:48] | |
| uint32_t | DSR_IMP:1 |
| DSR implemented [76]. | |
| uint32_t | READ_BLK_MISALIGN:1 |
| read block misalignment [77] | |
| uint32_t | WRITE_BLK_MISALIGN:1 |
| write block misalignment [78] | |
| uint32_t | READ_BL_PARTIAL:1 |
| partial blocks for read allowed [79] | |
| uint32_t | READ_BL_LEN:4 |
| max. More... | |
| uint32_t | CCC:12 |
| card command classes [95:84] | |
| uint32_t | TRAN_SPEED:8 |
| max. More... | |
| uint32_t | NSAC:8 |
| data read access-time-2 in CLK cycles [111:104] | |
| uint32_t | TAAC:8 |
| data read access-time-1 [119:112] | |
| uint32_t | reserved1:6 |
| reserved [125:120] | |
| uint32_t | CSD_STRUCTURE:2 |
| CSD structure [127:126]. | |
| uint32_t sdmmc_csd_v2_t::READ_BL_LEN |
| uint32_t sdmmc_csd_v2_t::TRAN_SPEED |
| uint32_t sdmmc_csd_v2_t::WRITE_BL_LEN |
1.9.1