Transcend Information TS1~2GUSD-S3 User Manual
Page 7
T
T
T
S
S
S
1
1
1
~
~
~
2
2
2
G
G
G
U
U
U
S
S
S
D
D
D
-
-
-
S
S
S
3
3
3
microSD Memory Card + Reader S3
Transcend Information Inc.
7
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 V
DD
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
corresponding bit (31) is set to LOW.