User manual TRANSCEND TS2GSDM QUICK INSTALLATION GUIDE

[. . . ] OCR register The 32-bit operation conditions register stores the VDD voltage profile of the card. In addition, this register includes a status information bit. This status bit is set if the card power up procedure has been finished. The OCR register shall be implemented by the cards which do not support the full operating voltage range of the SD Memory Card bus, or if the card power up extends the definition in the timing diagram. A voltage range is not supported if the corresponding bit value is set to LOW. [. . . ] The "m" field [11:8] is the month code. The "y" field [19:12] is the year code. As an example, the binary value of the Date field for production date "April 2001" will be: 00000001 0100. · CRC CRC7 checksum (7 bits). 3. CSD Register The Card-Specific Data register provides information on how to access the card contents. The CSD defines the data format, error correction type, maximum data access time, whether the DSR register can be used etc. The programmable part of the register (entries marked by W or E, see below) can be changed by CMD27. The type of the entries in the table below is coded as follows: R= readable, W(1) = writable once, W = multiple writable. 9 Transcend Information Inc. TS2GSDM 2GB microSD Card + Reader P3 The following sections describe the CSD fields and the relevant data types. If not explicitly defined otherwise, all bit strings are interpreted as binary coded numbers starting with the left bit first. · CSD_STRUCTURE Version number of the related CSD structure. · TAAC Defines the asynchronous part of the data access time. 01 Transcend Information Inc. TS2GSDM 2GB microSD Card + Reader P3 · NSAC Defines the worst case for the clock dependent factor of the data access time. Therefore, the maximal value for the clock dependent part of the data access time is 25. 5k clock cycles. The total access time NAC as expressed in the Table 34 is the sum of TAAC and NSAC. It has to be computed by the host for the actual clock rate. If ERASE_BLK_EN = '0', the host can erase one or multiple units of SECTOR_SIZE. The erase will start from the beginning of the sector that contains the start address to the end of the sector that contains the end address. For example, if SECTOR_SIZE=31 and the host sets the Erase Start Address to 5 and the Erase End Address to 40. If ERASE_BLK_EN = '1' the host can erase one or multiple units of 512 bytes. All blocks that contain data from start address to end address are erased. For example, if the host sets the Erase Start Address to 5 and the Erase End Address to 40. · SECTOR_SIZE 41 Transcend Information Inc. TS2GSDM 2GB microSD Card + Reader P3 The size of an erasable sector. not write protected. · FILE_FORMAT Indicates the file format on the card. The following formats are defined: 61 Transcend Information Inc. TS2GSDM · CRC 2GB microSD Card + Reader P3 The CRC field carries the check sum for the CSD contents. The checksum has to be recalculated by the host for any CSD modification. The default corresponds to the initial CSD contents. The following table lists the correspondence between the CSD entries and the command classes. A `+' entry indicates that the CSD field affects the commands of the related command class. 71 Transcend Information Inc. TS2GSDM 2GB microSD Card + Reader P3 4. [. . . ] SCR provides information on SD Memory Card's special features that were configured into the given card. This register shall be set in the factory by the SD Memory Card manufacturer. The following table describes the SCR register content. · SCR_STRUCTURE Version number of the related SCR structure in the SD Memory Card Physical Layer Specification. · SD_SPEC Describes the SD Memory Card Physical Layer Specification version supported by this card. 91 Transcend Information Inc. TS2GSDM · DATA_STAT_AFTER_ERASE 2GB microSD Card + Reader P3 Defines the data status after erase, whether it is `0' or `1' (the status is card vendor dependent). · SD_SECURITY Describes the security algorithm supported by the card. Security Protocol 1. 0 relates to Security Specification Version 0. 96. Security Protocol 2. 0 relates to Security Specification Version 1. 0. -1. 01 Note that it is mandatory for a regular writable SD Memory Card to support Security Protocol. [. . . ]