Filter
Top Products
T
T
T
S
S
S
2
2
2
G
G
G
S
S
S
D
D
D
1
1
1
5
5
5
0
0
0
2GB 150x Secure Digital Card
Transcend Information Inc.
9
4. Relative Card Address Register (RCA)
The writable 16-bit relative card address register carries the card address assigned by the host during the card
identification. This address is used for the addressed host-card communication after the card identification procedure.
The default value of the RCA register is 0x0001. The value 0x0000 is reserved to set all cards into the Stand-by State
with CMD7. In SD mode, the value of this register is generated by random number generator inside the card. Please
reference to SD specification for detail information.
5. Card Specific Data Register (CSD)
The Card-Specific Data register provides information on how to access the card contents. The CSD defines the data
format, error correction type, maximum data access time, data transfer speed, whether the DSR register can be used
etc. The programmable part of the register can be changed by CMD27.
CSD bit Width Name Field Value Note
[127:126] 2 CSD structure CSD_STRUCTURE 00 b v1.0
[125:120] 6 Reserved --- --- ---
[119:112] 8 Data read access-time 1 TAAC 7F h 80 ms
[111:104] 8 Data read access-time 2 NSAC FF h 25.5k clocks
[103:96] 8 Max. bus clock freq. TRAN_SPEED 32 h 25 MHz
[95:84] 12 Card command classes CCC 1F5 h (*1)
[83:80] 4 Max. read data block length READ_BL_LEN 9 h 512 bytes
[79] 1 Partial block read allowed READ_BL_PARTIAL 1 b Support
[78] 1 Write block misalignment WRITE_BLK_MISALIGN 1 b Support
[77] 1 Read block misalignment READ_BLK_MISALIGN 1 b Support
[76] 1 DSR implemented DSR_IMP 0 b Not support
[75:74] 2 Reserved --- --- ---
[73:62] 12 Device size C_SIZE (*2) (*2)
[61:59] 3 Max. R_curr @ VDD min VDD_R_CURR_MIN 101 b 35 mA
[58:56] 3 Max R_curr @ VDD max VDD_R_CURR_MAX 101 b 45 mA
[55:53] 3 Max W_curr @ VDD min VDD_W_CURR_MIN 101 b 35 mA
[52:50] 3 Max W_curr @ VDD max VDD_W_CURR_MAX 101 b 45 mA
[49:47] 3 Device size multiplier C_SIZE_MULT (*2) (*2)
[46] 1 Erase single block enable ERASE_BLK_EN 0 b Not allowed
[45:39] 7 Erase sector size SECTOR_SIZE (*3) (*3)
[38:32] 7 Write protect group size WP_GRP_SIZE (*4) (*4)
[31] 1 Write protect group enable WP_GRP_ENABLE 1 b Support
[30:29] 2 Reserved --- --- ---
[28:26] 3 Write speed factor R2W_FACTOR 101 b 32X
[25:22] 4 Max. write data block length WRITE_BL_LEN 9 h 512 bytes
[21] 1 Partial block write allowed WRITE_BL_PARTIAL 1 b Support
[20:16] 5 Reserved --- --- ---
[15] 1 File format group FILE_FORMAT_GRP 0 b HD like FAT