Rca Register; Multimediacard Registers In Spi Mode - SanDisk SDMB-16-470 - 16 MB MultiMedia Card Product Manual

4.5.6

RCA Register

The 16-bit relative card address register carries
the card address assigned by the host during t h e
card identification. This address is used for t h e
addressed host-card communication after the card
identification procedure. The default value of t h e
RCA register is 0x0001. The value 0x0000 is
reserved to set all cards in Stand-by State with
CMD7.
Table 4-20 MultiMediaCard Registers in SPI Mode
Name Available in
SPI Mode
CID Yes
RCA No
DSR No
CSD Yes
OCR No
SanDisk MultiMediaCard Product Manual Rev. 2 © 2000 SANDISK CORPORATION
Width
( B y t e s )
16 Card identification data (serial number, manufacturer ID etc.)
16 Card specific data, information about the card operation conditions.
MultiMediaCard Product Manual
4.5.7

MultiMediaCard Registers in SPI Mode

In SPI mode, only the MultiMediaCard CSD and
CID registers are accessible. Their format is
identical to the format in the MultiMediaCard
mode. However, a few fields are irrelevant in SPI
mode.
In SPI mode, the card status register has a
different, shorter, format as well. Refer to the SPI
Protocol section for more details.
Description
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