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1.0 Introduction to the MultiMediaCard
The SanDisk MultiMediaCard is a very small,
removable
flash
storage
specifically for storage applications that put a
premium on small form factor, low power and low
cost. Flash is the ideal storage medium for
portable, battery-powered devices. It features low
power consumption and is non-volatile, requiring
no power to maintain the stored data. It also has a
wide operating range for temperature, shock and
vibration.
The MultiMediaCard is well suited to meet t h e
needs of small, low power, electronic devices.
With a form factor of 32mm by 24mm and 1.4mm
thick, MultiMediaCards are expected to be used in
a wide variety of portable devices like mobile
phones, pagers and voice recorders. This ultra-
small form factor is part of a new, emerging,
proposed open standard.
To support this wide range of applications, t h e
MultiMediaCard protocol, a high performance
seven pin serial
interface,
maximum scalability
MultiMediaCard/SPI
Interface
SanDisk MultiMediaCard Product Manual Rev. 2 © 2000 SANDISK CORPORATION
device,
designed
is
designed for
and configurability. A l l
SanDisk
Single
Chip
Controller
Figure 1-1 MultiMediaCard Block Diagram
MultiMediaCard Product Manual
device and interface configuration data (such as
maximum frequency, card identification, etc.) are
stored on the card.
The MultiMediaCard interface allows for easy
integration
into
any
microprocessor used. For compatibility
existing controllers, the MultiMediaCard offers,
in addition to the MultiMediaCard interface, an
alternate communication protocol which is based
on the SPI standard.
The MultiMediaCard provides up to 32 million
bytes of memory using SanDisk Flash memory
chips which were designed by SanDisk especially
for use in mass storage applications. In addition to
the mass storage specific flash memory chip, t h e
MultiMediaCard includes an on-card intelligent
controller which manages interface protocols and
data storage and retrieval, as well as Error
Correction
Code
(ECC)
handling and diagnostics, power management and
clock control.
Data
In/Out
Control
SanDisk MultiMediaCard
design,
regardless
of
with
algorithms,
defect
SanDisk
Flash
Modules
7
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