
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
[127:126]
[125:120]
[119:112]
[111:104]
[103:96]
[95:84]
[83:80]
[79]
[78]
[77]
[76]
[75:74]
[73:62]
[61:59]
[58:56]
[55:53]
[52:50]
[49:47]
[46]
[45:39]
[38:32]
[31]
[30:29]
[28:26]
[25:22]
[21]
[20:16]
[15]
Width
2
6
8
8
8
12
4
1
1
1
1
2
12
3
3
3
3
3
1
7
7
1
2
3
4
1
5
1
Name
Field
Value
00 b
---
7F h
FF h
32 h
1F5 h
9 h
1 b
1 b
1 b
0 b
---
(*2)
101 b
101 b
101 b
101 b
(*2)
0 b
(*3)
(*4)
1 b
---
101 b
9 h
1 b
---
0 b
Note
v1.0
---
80 ms
25.5k clocks
25 MHz
(*1)
512 bytes
Support
Support
Support
Not support
---
(*2)
35 mA
45 mA
35 mA
45 mA
(*2)
Not allowed
(*3)
(*4)
Support
---
32X
512 bytes
Support
---
HD like FAT
CSD structure
Reserved
Data read access-time 1
Data read access-time 2
Max. bus clock freq.
Card command classes
Max. read data block length
Partial block read allowed
Write block misalignment
Read block misalignment
DSR implemented
Reserved
Device size
Max. R_curr @
VDD
min
Max R_curr @
VDD
max
Max W_curr @
VDD
min
Max W_curr @
VDD
max
Device size multiplier
Erase single block enable
Erase sector size
Write protect group size
Write protect group enable
Reserved
Write speed factor
Max. write data block length
Partial block write allowed
Reserved
File format group
CSD_STRUCTURE
---
TAAC
NSAC
TRAN_SPEED
CCC
READ_BL_LEN
READ_BL_PARTIAL
WRITE_BLK_MISALIGN
READ_BLK_MISALIGN
DSR_IMP
---
C_SIZE
VDD_R_CURR_MIN
VDD_R_CURR_MAX
VDD_W_CURR_MIN
VDD_W_CURR_MAX
C_SIZE_MULT
ERASE_BLK_EN
SECTOR_SIZE
WP_GRP_SIZE
WP_GRP_ENABLE
---
R2W_FACTOR
WRITE_BL_LEN
WRITE_BL_PARTIAL
---
FILE_FORMAT_GRP