SanDisk 4GB micro SDHC Memory Card for Product Manual - Page 21

SanDisk microSD™, microSDHC™ and microSDXC™ cards OEM Product Manual 2.5 3.5.5 SD Status Register The SD Status Register (SSR) contains status bits that are related to the microSD Card proprietary features and may be used for future applications. The SD Status structure is described in Section 4.10.2 in the SDA Physical Layer Specification, Version 3.01. 3.5.6 Relative Card Address Register The 16-bit Relative Card Address (RCA) Register carries the card address published by the card during the card identification. Refer to Section 5.4 in the SDA Physical Layer Specification, Version 3.01 for more information. 3.5.7 SD Card Configuration Register The SD Card Configuration Register (SCR) is in addition to the CSD Register. The SCR provides information about special features in the SanDisk SD Card products. For more information, refer to Section 5.6 in the SDA Physical Layer Specification, Version 3.01. 3.5.8 microSD Card Product Family Registers in SPI Mode All card registers are accessible in SPI Mode. Their format is identical to the format in the SD Bus Mode; however a few fields are irrelevant in SPI Mode. In SPI Mode, the Card Status Register also has a different, shorter format. Refer to Section 7.4 in the SDA Physical Layer Specification, Version 3.01 for more details. 3.5.9 Data Interchange Format and Card Sizes In general, a file system provides structure for data in SanDisk microSD Card products. The SD Card File System Specification, published by the SDA, describes the file format system that is implemented in the SanDisk microSD Card products. In general, each card is divided into two separate DOS-formatted partitions as follows: • User Area-used for secured and non-secured data storage and can be accessed by the user with regular read/write commands. • Security Protected Area-used by content protection applications to save security related data and can be accessed by the host using the secured read/write command after doing authentication as defined in the SD Security Specification. The security protected area size is defined by SanDisk as approximately one percent of the total size of the card. January 2012 Version 2.5 © 2008 - 2012 SanDisk Corporation. SanDisk Confidential, subject to all applicable non-disclosure agreements 16