1 card identification register, 2 card specific data register – SanDisk SD064 User Manual
Page 7

Register Abbreviation
Width (in bits)
Register Name
CID 128
Card
IDentification
CSD 128
Card-Specific
Data
SCR
64
SD Configuration Register
RCA
16
Relative Card Address
OCR
32
Operation Condition Register
SSR
512
SD Status Register
CSR 32
Card
Status
Register
All card registers are also accessible in SPI Mode. Their format is identical to the format in the
SD Bus Mode; however, a few fields are not used in SPI Mode. In SPI Mode, the Card Status
Register has a different, shorter format as well. Refer to Section 7.4 in the SDA Physical Layer
Specification, Version 2.00, for more details.
3.3.1 Card Identification Register
The Card Identification (CID) Register is 16 bytes long and contains the unique card
identification number and other informational data. It is programmed during card content
programming and cannot be changed by card hosts.
The following table lists the default configuration of the CID register for SanDisk SD-ROM Cards.
More information can be found in Section 5.2 of the SDA Physical Layer Specification, Version
2.00.
Name
Type
Size
Value
Comments
Manufacturer ID (MID)
binary
8
0x03 (SanDisk)
Controlled and assigned by SD-
3C, LLC.
OEM / Application ID (OID)
ASCII
16
0x53, 0x44 (“SD”)
Identifies the card OEM and/or
the card contents. Controlled
and assigned by SD-3C, LLC.
Product Name (PNM)
ASCII
40
SD032
SD064
SD128
5-character ASCII string
Product Revision (PRV)
BCD
8
2-digit revision number
Serial Number (PSN)
Binary
32
32-bit unsigned integer
Reserved
4
Manufacture Date (MDT)
Binary
12
YYM code
(offset from 2000)
ex: April 2001 = 0x014
CRC7 Checksum (CRC)
7
calculated from register
contents
unused (always 0)
1
3.3.2 Card Specific Data Register
The Card Specific Data (CSD) Register configuration information is required to access card data.
The CSD defines the data format, error correction type, maximum data access time, and other
parameters. The field structures of the CSD Register vary depending on the physical
specifications and card capacity. The CSD_STRUCTURE field in the CSD Register indicates
which structure version is used. All current SanDisk SD-ROM are standard capacity cards and
so implement CSD Version 1.0 structure.
The following table provides an overview of the CSD Register. More field-specific information
can be found in Table 5-4 (Section 5.3.2) of the SDA Physical Layer Specification, Version 2.00.
SanDisk Confidential