SanDisk SD-ROM, Product Manual

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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.
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