N2M400FDB311A3CE Datasheet, PDF (10/19 Pages) Micron Technology – e·MMC™ Memory

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Preliminary
CSD Register
4GB, 8GB, 16GB, 32GB: e·MMC
CSD Register
The card-specific data (CSD) register provides information about accessing the device
contents. The CSD register defines the data format, error correction type, maximum da-
ta access time, and data transfer speed, as well as whether the DS register can be used.
The programmable part of the register (entries marked with W or E in the following ta-
ble) can be changed by the PROGRAM_CSD (CMD27) command.
Table 5: CSD Register Field Parameters
Name
Field
CSD structure
CSD_STRUCTURE
System specification version
SPEC_VERS
Reserved²
–
Data read access time 1
TAAC
Data read access time 2 in CLK cy- NSAC
cles (NSAC × 100)
Maximum bus clock frequency TRAN_SPEED
Card command classes
CCC
Maximum read data block length READ_BL_LEN
Partial blocks for reads supported READ_BL_PARTIAL
Write block misalignment
WRITE_BLK_MISALIGN
Read block misalignment
READ_BLK_MISALIGN
DS register implemented
DSR_IMP
Reserved
–
Device size
C_SIZE
Maximum read current at V_DD,min VDD_R_CURR_MIN
Maximum read current at V_DD,max VDD_R_CURR_MAX
Maximum write current at
VDD_W_CURR_MIN
V_DD,min
Maximum write current at
VDD_W_CURR_MAX
V_DD,max
Device size multiplier
C_SIZE_MULT
Erase group size
ERASE_GRP_SIZE
Erase group size multiplier
ERASE_GRP_MULT
Write protect group size
WP_GRP_SIZE
N2M400FDB311A3C[E/F]
N2M400GDB321A3C[E/F]
N2M400HDB321A3C[E/F]
N2M400JDB341A3C[E/F]
Write protect group enable
WP_GRP_ENABLE
Manufacturer default ECC
DEFAULT_ECC
rite-speed factor
R2W_FACTOR
Cell
Width Type¹
2
R
4
R
2 TBD
8
R
8
R
CSD
Bits
[127:126]
[125:122]
[121:120]
[119:112]
[111:104]
CSD
Value
03h
4h
–
4Fh
01h
8
R
[103:96]
32h
12
R
[95:84] 0F5h
4
R
[83:80]
9h
1
R
79
0h
1
R
78
0h
77
R
77
0h
1
R
76
1h
2
R
[75:74]
–
12
R
[73:62]
FFFh
3
R
[61:59]
7h
3
R
[58:56]
7h
3
R
[55:53]
7h
3
R
[52:50]
7h
3
R
[49:47]
7h
5
R
[46:42]
1Fh
5
R
[41:37]
1Fh
5
R
[36:32]
07h
0Fh
1Fh
1
R
31
1h
2
R
[30:29]
0h
3
R
[28:26]
2h
PDF: 09005aef84a4d6f1
emmc_4gb_8gb_16gb_32gb_100b-it.pdf - Rev. C 7/12 EN
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