Field Value Comments
CSD_STRUCTURE 1.0 CSD structure
Reserved Reserved
TAAC 1.5ms Data read access time – 1
NSAC 0
Data read access time – 2 in CLK cycles
(NSAC*100)
TRANS_SPEED 25MHz Maximum data transfer rate
CCC 0x5F5 Card Command Classes
READ_BL_LEN 512 bytes Maximum read data block length
READ_BL_PARTIAL Yes Partial blocks for read allowed
WRITE_BLK_MISALIGN No Write block misalignment
READ_BLK_MISALIGN No Read block misalignment
DSR_IMP No DSR implemented
Reserved Reserved
C_SIZE depends on card
size Device Size
VDD_R_CURR_MIN 100mA Maximum read current @VDD minimum
VDD_R_CURR_MAX 80mA Maximum read current @VDD maximum
VDD_W_CURR_MIN 100mA Maximum write current @VDD minimum
VDD_W_CURR_MAX 80mA Maximum write current @VDD maximum
C_SIZE_MULT depends on card
size Device size multiplier
ERASE_BLK_EN Yes Erase single block enable
SECTOR_SIZE 32 blocks Erase sector size
WP_GRP_SIZE 128 sectors Write protect group size
WP_GRP_ENABLE Yes Write protect group enable
Reserved Reserved for MMC compatibility
R2W_FACTOR x16 Write speed factor
WRITE_BL_LEN 512 bytes Maximum write data block length
WRITE_BL_PARTIAL No Partial blocks for write allowed
FILE_FORMAT_GRP 0 File format group
COPY Has been copied Copy flag (OTP)
PERM_WRITE_PROTECT Not protected Permanent write protection
TMP_WRITE_PROTECT Not protected Temporary write protection
FILE_FORMAT HD w/partition File format
Reserved Reserved
CRC CRC7 CRC
Not used, always “1”
3.3.3 SD Card Configuration Register