Datasheet
- 10 -
datasheet SD Card
Rev. 1.0
MMBTFxxGWBCA-xMExx
4.3.4 CSD Register (CSD Version 2.0)
The following Table shows Definition of the CSD Version 2.0 for the High Capacity SD Memory Card and Extended Capacity SD Memory Card. The fol-
lowing sections describe the CSD fields and the relevant data types for the High Capacity SD Memory Card.
CSD Version 2.0 is applied to only the High Capacity SD Memory Card. The field name in parenthesis is set to fixed value and indicates that the host is
not necessary to refer these fields. The fixed values enables host, which refers to these fields, to keep compatibility to CSD Version 1.0. The Cell Type
field is coded as follows: R = readable, W(1) = writable once, W = multiple writable.
[Table 4-7] : The CSD Register Fields (CSD Version 2.0)
4.3.5 RCA Register
The writable 16-bit relative card address register carries the card address that is published by the card 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 0x0000. The value 0x0000 is
reserved to set all cards into the Stand-by State with CMD7.
Name Field Width
Cell
Type
CSD-slice
CSD Value
4GB 8GB 16GB
CSD structure CSD_STRUCTURE 2 R [127:126] CSD Version 2.0
Reserved - 6 R [125:120] -
Data read access-time (TAAC) 8 R [119:112] 1000.00 us
Data read access-time
in CLK cycles (NSAC*100)
(NSAC) 8 R [111:104] 0 cycles
Max. Data transfer rate (TRAN_SPEED) 8 R [103:96] 25 Mbit/s or 50 Mbit/s
Card command classes CCC 12 R [95:84] class 0 2 4 5 7 8 10
Max. read data block length (READ_BL_LEN) 4 R [83:80] 512 bytes
Partial blocks for read allowed (READ_BL_PARTIAL) 1 R [79:79] 0
Write block misalignment (WRITE_BLK_MISALIGN) 1 R [78:78] 0
Read block misalignment (READ_BLK_MISALIGN) 1 R [77:77] 0
DSR implemented DSR_IMP 1 R [76:76] 0
Reserved - 6 R [75:70] -
Device size C_SIZE 22 R [69:48] 7579 15191 30531
Reserved - 1 R [47:47] -
Erase single block enable (ERASE_BLK_EN) 1 R [46:46] 1
Erase sector size (SECTOR_SIZE) 7 R [45:39] 128 blocks
Write protect group size (WP_GRP_SIZE) 7 R [38:32] 1 sectors
Write protect group enable (WP_GRP_ENABLE) 1 R [31:31] 0
Reserved - 2 R [30:29] -
Write speed factor (R2W_FACTOR) 3 R [28:26] 4
Max. write data block length (WRITE_BL_LEN) 4 R [25:22] 512 bytes
Partial blocks for write allowed (WRITE_BL_PARTIAL) 1 R [21:21] 0
Reserved - 5 R [20:16] -
File format group (FILE_FORMAT_GRP) 1 R [15:15] 0
Copy flag (OTP) COPY 1 R/W(1) [14:14] 0
Permanent write protection PERM_WRITE_PROTECT 1 R/W(1) [13:13] 0
Temporary write protection TMP_WRITE_PROTECT 1 R/W [12:12] 0
File format (FILE_FORMAT) 2 R [11:10] 0
Reserved 2 R [9:8] -
CRC CRC 7 R/W [7:1] -
Not used, always ’1’ - 1 - [0:0] -