User manual TRANSCEND TS16GJFV85

[. . . ] 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. One status bit is set if the card power up procedure has been finished. This register includes another status bit indicating the card capacity status after set power up status bit. [. . . ] If a Dual Voltage Card does not receive CMD8, OCR bit 7 in the response indicates 0, and the Dual Voltage Card which received CMD8, sets this bit to 1. Bit 31 - Card power up status bit, this status bit is set if the card power up procedure has been finished. Bit 30 - Card capacity status bit, this status bit is set to 1 if card is High Capacity SD Memory Card. The Card Capacity status bit is valid after the card power up procedure is completed and the card power up status bit is set to 1. The Host shall read this status bit to identify a Standard or High Capacity SD Memory Card. The OCR register shall be implemented by the cards. Transcend Information Inc. 11 microSDHC4 Card series 4~16GB High Capacity microSD Card OCR Register Definition 1) This bit is valid only when the card power up status bit is set. 2) This bit is set to LOW if the card has not finished the power up routine. A voltage range is not supported if the corresponding bit value is set to LOW. As long as the card is busy, the corresponding bit (31) is set to LOW. 2. CID Register The Card IDentification (CID) register is 128 bits wide. It contains the card identification information used during the card identification phase. And when the timing mode returns to the default by CMD6 or CMD0 command, its value will be 032h. · CCC The SD Memory Card command set is divided into subsets (command classes). The card command class register CCC defines which command classes are supported by this card. Host should not use this field. 4~16GB High Capacity microSD Card · 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). Host should not use this field. · CRC 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 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. Transcend Information Inc. 19 microSDHC4 Card series 4~16GB High Capacity microSD Card 4. RCA Register The writable 16-bit relative card address register carries the card address that is published by the card during the card identification. [. . . ] 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. It can be optionally used to improve the bus performance for extended operating conditions (depending on parameters like bus length, transfer rate or number of cards). The CSD register carries the information about the DSR register usage. [. . . ]