SanDisk microSD™, microSDHC™ and microSDXC™ cards
OEM Product Manual
2.5
January 2012 Version 2.5 © 2008 - 2012 SanDisk Corporation. SanDisk Confidential, subject to all applicable non-disclosure agreements
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Refer to Section 5.3.3, Table 5-16 of the SDA Physical Layer Specification, Version
3.01 for more detailed information.
Table 9: CSD Register (CSD Version 2.0)
Field
Typical CSD Value
Description
CSD_STRUCTURE 2.0
CSD
Structure
- -
Reserved
TAAC
1.5 msec
Data read access-time
NSAC
0
Data read access-time-2 in CLK cycles
(NSAC*100)
TRANS_SPEED
Standard Mode 25 MHz
High Performance Mode 50MHz
Ultra High Speed Mode 104MHz
Maximum data transfer rate
CCC
All (inc. WP, lock/unlock)
Card command classes
READ_BL_LEN
9
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
- 0
Reserved
C_SIZE
See SDA Physical Layer
Specification
Device size
- 0
Reserved
ERASE_BLK_EN 1
Erase
single block enable
SECTOR_SIZE
64 blocks
Erase sector size
WP_GRP_SIZE
000000b
Write protect group size
WP_GRP_ENABLE
No
Write protect group enable
Reserved -
Reserved
for
MMC
compatibility
R2W_FACTOR
X4
Write speed factor
WRITE_BL_LEN
Maximum write data block length
WRITE_BL_PARTIAL No
Partial
blocks
for
write
allowed
- -
Reserved
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"
3.5.4
Card Status Register
The Card Status Register (CSR) transmits the card's status information (which may be
stored in a local status register) to the host. The CSR is defined in Section 4.10.1 in
the SDA Physical Layer Specification, Version 3.01.
