MC56U032DCCA Datasheet, PDF (28/64 Pages) Samsung semiconductor – Dual Voltage MultiMediaCard Specification

MultiMediaCard^TM
FILE_FORMAT
Indicates the file format on the card. This field is read-only for ROM. The following formats are defined.
FILE_FORMAT
_GRP
0
0
0
0
1
FILE_FOR
MAT
0
1
2
3
0,1,2,3
Type
Hard disk-like file system with partition table
DOS FAT (floppy-like) with boot sector only (no partition table)
Universal File Format
Others/Unknown
Reserved
ECC
Defines the ECC code that was used for storing data on the card. This field is used by the host (or
application) to decode the user data. The following table defines the field format.
ECC
0
1
2-3
ECC Type
None (default)
BCH (542,512)
0,1,2,3
Maximum number of correctable bits
None
3
-
The content provider or customer defines which kind of error correction may be used to protect the
contents of MultiMediaCard. This value is programmable.
CRC7
The CRC7 contains the check sum for the CSD content. The check sum is computed according to
chapter “Cyclic Redundancy Check(CRC)”.
4.6 MultiMediaCard Communication
All communication between host and cards is controlled by the host (master). The host sends
commands and, depending on the command, receives a corresponding response from the selected
card. In this chapter the commands to control the MultiMediaCard, the card responses and the
contents of the status and error field included in the responses, are defined.
4.6.1 Commands
The command set of the MultiMediaCard system is divided into classes corresponding to the type of
card. The MultiMediaCard supports the following command classes:
Table 4-8 Command Classes
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