Data Transfer Mode - SanDisk SDMB-16-470 - 16 MB MultiMedia Card Product Manual

identified. The time-out condition to recognize
completion is the absence of a start bit for more
than 5 clock periods after sending CMD2.
Figure 5-2 MultiMediaCard State Diagram (Data Transfer Mode)
CMD7 is used to select one MultiMediaCard and
place it in the Transfer
MultiMediaCard can be in the Transfer State at a
If a
given time.
MultiMediaCard is in the Transfer State, its
connection with the host is released and it will
move back to the Stand-by State. When CMD7 is
issued with the reserved relative card address
"0x0000," all cards transfer back to Stand-by
State. This command is used to identify new cards
SanDisk MultiMediaCard Product Manual Rev. 2 © 2000 SANDISK CORPORATION
State. Only one
previously selected
MultiMediaCard Product Manual
5.3

Data Transfer Mode

When all cards are
communication over the CMD and DAT lines will
be in push-pull mode. Until the content of all CSD
registers is known by the host, the f
must remain at f because some cards may have
OD
operating frequency restrictions. The host issues
SEND_CSD (CMD9) to obtain the Card Specific
Data (CSD register), e.g. ECC type, block length,
card storage capacity, maximum clock rate, etc.
without resetting other already acquired cards.
MultiMediaCards which already have an RCA
do not respond to the identification command flow
in this state.
All data communication in the Data Transfer
Mode is point-to point between the host and t h e
selected MultiMediaCard
commands). All addressed
acknowledged with a response on the CMD line.
in Stand-by State
clock rate
PP
(using addressed
commands are
41