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1.5.8.3
Card Acquisition and Identification
The MultiMediaCard bus is a single master
(MultiMediaCard host) and multi-slaves (cards)
bus. The host can query the bus and find out how
many cards of which type are currently connected.
The MultiMediaCard's
programmed with a unique card identification
number which is used during the acquisition and
identification procedure.
In addition, the MultiMediaCard host can read
the card's CID register using the READ_CID
MultiMediaCard command. The CID register is
SanDisk MultiMediaCard Product Manual Rev. 2 © 2000 SANDISK CORPORATION
CID register is pre-
MultiMediaCard Product Manual
programmed during the MultiMediaCard testing
and formatting procedure, on the manufacturing
floor. The MultiMediaCard host can only read
this register and not write to it.
1.5.8.4
Card Status
MultiMediaCard status is stored in a 32 bit status
register which is sent as the data field in the card
respond to host
commands.
provides information about the card's current state
and completion codes for the last host command.
The card status can be explicitly read (polled)
with the SEND_STATUS command.
Status
register
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