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MultiMediaCard Product Manual
1.1
Scope
This document describes the key features and
specifications of the MultiMediaCard, as well as
the information required to interface this product
to a host system.
1.3
System Features
• Up to 32 Mbytes of data storage
• MultiMediaCard protocol compatible
• Supports SPI Mode
• Targeted for portable and stationary applications
• Voltage range — Communication: 2.0 - 3.6V, Memory Access: 2.7 - 3.6V
• Maximum data rate with up to 10 cards
• Correction of memory field errors
• Built-in write protection features (permanent and temporary)
• Comfortable erase mechanism
• Variable clock rate 0 - 20 Mhz
• Multiple cards stackable on a single physical bus
The performance of the communication channel is described in the table below:
Table 1-2 MultiMediaCard/SPI Comparison
MultiMediaCard
Three-wire serial data bus (Clock, command, data)
Up to 64k cards addressable by the bus protocol
Easy card identification
Error-protected data transfer
Sequential and single/multiple block oriented data
transfer
8
1.2
Product Models
The
MultiMediaCard
capacities shown in the following table:
Table 1-1 MultiMediaCard Capacities
Model No.
SDMB-16
SDMB-32
Three-wire serial data bus (Clock, dataIn, dataOut)
+ card specific CS signal.
Card selection via a hardware CS signal
Not available
Optional. A non protected data transfer mode is
available.
Single block read/write
SanDisk MultiMediaCard Product Manual Rev. 2 © 2000 SANDISK CORPORATION
is
available
Capacities
SDMB-4
4.0 MB
SDMB-8
8.0 MB
16.0 MB
32.1 MB
S P I
in
t h e
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