MC2GH256NMCA-2SA00 SAMSUNG [Samsung semiconductor], MC2GH256NMCA-2SA00 Datasheet - Page 71

• Manufacturer Part Number: MC2GH256NMCA-2SA00
• Description: SAMSUNG MultiMediaCard
• Manufacturer: SAMSUNG [Samsung semiconductor]

6.11 Memory Array Partitioning
The basic unit of data transfer to/from the MultiMediaCard is one byte. All data transfer operations which require a block
size always define block lengths as integer multiples of bytes. Some special functions need other partition granularity.
For block oriented commands, the following definition is used:
• Block: is the unit which is related to the block oriented read and write commands. Its size is the number of bytes which
will be transferred when one block command is sent by the host. The size of a block is either programmable or fixed. The
information about allowed block sizes and the programmability is stored in the CSD.
For R/W cards, special erase and write protect commands are defined:
The granularity of the erasable units is the Erase Group: The smallest number of consecutive write blocks which can be
addressed for erase. The size of the Erase Group is card specific and stored in the CSD.
The granularity of the Write Protected units is the WP-Group: The minimal unit which may be individually write protected.
Its size is defined in units of erase groups. The size of a WP-group is card specific and stored in the CSD.
Revision 0.3
MultiMediaCard
Write Protect Group 0
Write Block 0
Write Protect Group n
Erase Group 0
Erase Group 1
Erase Group 2
Erase Group 3
Erase Group n
Write Protect Group 1
Write Protect Group 2
Write Block 1
Figure 6-5 : Memory Array Partitioning
Write Block 2
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Write Block 3
Write Block n
MultiMediaCard
Sep.22.2005
TM