User manual TRANSCEND TS2GXDPCM QUICK INSTRUCTION GUIDE

[. . . ] The OCR, CID, CSD and SCR registers carry the card/content specific information, while the RCA and DSR registers are configuration registers storing actual configuration parameters. 1. 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 MID number is controlled, defined and allocated to a SD Memory Card manufacturer by the SD Group. This procedure is established to ensure uniqueness of the CID register. · OID A 2 ASCII string characters that identifies the card OEM and/or the card contents (when used as a distribution media either on ROM or FLASH cards). The OID number is controlled, defined and allocated to a SD Memory Card manufacturer by the SD Group. This procedure is established to ensure uniqueness of the CID register. · PNM The product name is a string, 5 ASCII characters long. · PRV The product revision is composed of two Binary Coded Decimal (BCD) digits, four bits each, representing an "n. m" revision number. The "n" is the most significant nibble and "m" is the least significant nibble. As an example, the PRV binary value field for product revision "6. 2" will be: 0110 0010 · PSN The Serial Number is 32 bits of binary number. · MDT Transcend Information Inc. 9 TS256M~2GUSD microSD Memory Card The manufacturing date composed of two hexadecimal digits, one is 8 bit representing the year(y) and the other is four bits representing the month(m). 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 memory capacity of the card is computed from the entries C_SIZE, C_SIZE_MULT and READ_BL_LEN as follows: memory capacity = BLOCKNR * BLOCK_LEN where BLOCKNR = (C_SIZE+1) * MULT (C_SIZE_MULT < 8) MULT = 2C_SIZE_MULT+2 (READ_BL_LEN < 12) BLOCK_LEN = 2READ_BL_LEN, Maximum capacity of the card, compliant to SD Physical Specification Versoin1. 01 shall be up to2G bytes (231 bytes) to be consistent with the maximum capacity (2G bytes) of SD Memory Card File System Specification Ver. 1. 01. To indicate 2GByte card, BLOCK_LEN shall be 1024 bytes. Therefore, the maximal capacity which can be coded is 4096*512*1024 = 2G bytes. Example: A 32Mbyte card with BLOCK_LEN = 512 can be coded by C_SIZE_MULT = 3 and C_SIZE = 2000. · VDD_R_CURR_MIN, VDD_W_CURR_MIN The maximum values for read and write currents at the minimal power supply VDD are coded as follows: · VDD_R_CURR_MAX, VDD_W_CURR_MAX The maximum values for read and write currents at the maximal power supply VDD are coded as follows: · C_SIZE_MULT This parameter is used for coding a factor MULT for computing the total device size (see `C_SIZE'). Transcend Information Inc. 14 TS256M~2GUSD The factor MULT is defined as 2C_SIZE_MULT+2. microSD Memory Card · ERASE_BLK_EN The ERASE_BLK_EN defines the granularity of the unit size of the data to be erased. The minimum block sizeis one byte. · FILE_FORMAT_GRP Indicates the selected group of file formats. This field is read-only for ROM. · COPY Defines if the contents is original (= `0') or has been copied (='1'). The COPY bit for OTP and MTPdevices, sold to end consumers, is set to `1' which identifies the card contents as a copy. The COPY bit is an one time programmable bit. · PERM_WRITE_PROTECT Permanently protects the whole card content against overwriting or erasing (all write and erase commands for this card are permanently disabled). not permanently write protected. · TMP_WRITE_PROTECT Temporarily protects the whole card content from being overwritten or erased (all write and erase commands for this card are temporarily disabled). not write protected. · FILE_FORMAT Indicates the file format on the card. The following formats are defined: · CRC The CRC field carries the check sum for the CSD contents. [. . . ] This address is used for the addressed host-card communication after the card identification procedure. The default value of the RCA register is 0x0000. The value0x0000 is reserved to set all cards into the Stand-by State with CMD7. 5. DSR Register (Optional) The 16-bit driver stage register is described in detail in Chapter 6. 5. [. . . ]