SanDisk SD032, SD-ROM, SD128, SD064 manual Card Identification Register, Card Specific Data Register

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.
				SD032
Product Name (PNM)	ASCII		40	SD064		5-character ASCII string
				SD128
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		ex: April 2001 = 0x014
				(offset from 2000)
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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