Datasheet
S
S
S
D
D
D
H
H
H
C
C
C
1
1
1
0
0
0
C
C
C
a
a
a
r
r
r
d
d
d
s
s
s
e
e
e
r
r
r
i
i
i
e
e
e
s
s
s
Rev. 1.0
4~32GB High Capacity Secure Digital Card
Transcend Information Inc.
14
3. CSD Register
The CSD Register shows Definition of the CSD for the High Capacity SD Memory Card and Extended Capacity SD
Memory Card (CSD Version 2.0). The following sections describe the CSD fields and the relevant data types for the
High Capacity SD Memory Card.
CSD Version 2.0 is applied to SDHC and SDXC Cards. 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.
Name
Field
Width
Value
Cell Type
CSD-slice
CSD structure
CSD_STRUCTURE
2
01b
R
[127:126]
reserved
-
6
00 0000b
R
[125:120]
data read access-time
(TAAC)
8
0Eh
R
[119:112]
data read access-time in CLK
(NSAC)
8
00h
R
[111:104]
max. data transfer rate
(TRAN_SPEED)
8
32h, 5Ah, 0Bh or 2Bh
R
[103:96]
card command classes
CCC
12
01x110110101b
R
[95:84]
max. read data block length
(READ_BL_LEN)
4
9
R
[83:80]
partial blocks for read allowed
(READ_BL_PARTIAL)
1
0
R
[79:79]
write block misalignment
(WRITE_BLK_MISALIGN)
1
0
R
[78:78]
read block misalignment
(READ_BLK_MISALIGN)
1
0
R
[77:77]
DSR implemented
DSR_IMP
1
x
R
[76:76]
reserved
-
6
00 0000b
R
[75:70]
device size
C_SIZE
22
xxxxxxh
R
[69:48]
reserved
-
1
0
R
[47:47]
erase single block enable
(ERASE_BLK_EN)
1
1
R
[46:46]
erase sector size
(SECTOR_SIZE)
7
7Fh
R
[45:39]
write protect group size
(WP_GRP_SIZE)
7
0000000b
R
[38:32]
write protect group enable
(WP_GRP_ENABLE)
1
0
R
[31:31]
reserved
2
00b
R
[30:29]