Csd Register - SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Product Manual

Name
Manufacturer ID (MID)
OEM/Application ID (OID)
Product Name (PNM)
Product Revision** (PRV)
Serial Number (PSN)
Reserved
Manufacture Date Code (MDT)
CRC7 checksum*** (CRC)
Not used, always '1'
* 3C = The 3 SDA founding companies: Toshiba, SanDisk, and MEI.
** The product revision is composed of two Binary Coded Decimal (BCD) digits, four bits each, representing an "n.m"
revision number. The "n" is the most significant nibble and the "m" is the least significant nibble. Example: The PRV
binary value filed for product revision "6.2" will be: 0110 0010.
*** The CRC Checksum is computed by the following formula:
CRC Calculation: G(x)=x7+3+1
M(x)=(MID-MSB)*x119+...+(CIN-LSB)*x0
CRC[6...0]=Remainder[(M(x)*x7)/G(x)]

3.5.3. CSD Register

The Card Specific Data (CSD) register contains configuration information required to access the card data. In
Table 3-10, the cell type column defines the CSD field as Read only (R), One Time Programmable (R/W) or
erasable (R/W/E). This table shows the value in "real world" units for each field and coded according to the CSD
structure. The Model dependent column marks (with a check mark, ) the CSD fields that are model dependent.
Note that the CSD register in the SD Card has a different structure than the CSD in the MultiMediaCard.
Name
CSD structure
Reserved
data read access-time-1
data read access-time-2 in CLK cycles
(NSAC*100)
max. data transfer rate
card command classes
SanDisk Secure Digital (SD) Card Product Manual, Rev. 1.9 © 2003 SANDISK CORPORATION
Table 3-9. CID Fields
Type Width CID—Slice
Binary 8 [127:120]
ASCII 16 [119:104]
ASCII 40 [103:64]
BCD 8 [63:56]
Binary 32 [55:24]
4 [23:20]
BCD 12 [19:8]
Binary 7 [7:1]
1 [0:0]
Table 3-10. CSD Register
Field
CSD_STRUCTURE
-
TAAC
Binary
MLC
NSAC
TRAN_SPEED
CCC
Comments
The manufacturer IDs are controlled
and assigned by the SD Card
Association.
Identifies the card OEM and/or the
card contents. The OID is assigned
by the 3C.*
5 ASCII characters long
Two binary coded decimal digits
32 Bits unsigned integer
Manufacture date–yym (offset from
2000)
Calculated
Width Cell CSD-Slice
Type
2 R [127:126]
6 R [125:120]
8 R [119:112]
8 R [119:112]
8 R [111:104]
8 R [103:96]
12 R [95:84]
SD Card Interface Description
CID Value
0x03
SD ASCII Code 0x53, 0x44
SD128, SD064, SD032,
SD016, SD008
Product Revision (30)
Product Serial Number
Manufacture date(for
example: Apr 2001 = 0x014)
CRC7
CSD Value CSD Code
1.0 00b
- 000000b
1.5msec 00100110b
10msec 00001111b
0 00000000b
25MHz 00110010b
All (incl. WP, 1F5h
Lock/unlock)
3-13