Transcend Information TS2GUSD-P3 Register Information, OCR register, Transcend Information Inc

TS2GUSD-P3 2GB microSD Card + Reader P3

Register Information

Within the card interface six registers are defined: OCR, CID, CSD, RCA, DSR and SCR. These can be accessed only by corresponding commands (see Chapter 4.7). 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 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. As long as the card is busy, the

Transcend Information Inc.

7