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Block Length in MMC

 
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FGiordani



Joined: 25 Dec 2005
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Block Length in MMC
PostPosted: Thu Jan 19, 2006 12:15 pm     Reply with quote
All MMC cards have 512 bytes block length only in one write/read cycle??
Humberto



Joined: 08 Sep 2003
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Location: Buenos Aires, La Reina del Plata

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PostPosted: Thu Jan 19, 2006 4:30 pm     Reply with quote
Quote:

All MMC cards have 512 bytes block length only in one write/read cycle??


Reading and writting to an MMC is generally done in 512 byte blocks, however erasing
often can be done in much larger blocks. For example SanDisk and other vendors has a
NAND architecture with an Erase Block capability of (32) or (64) 512 byte blocks, depending
of the card capacity. That is, in order to re-write a single 512 byte block, all other blocks that
belong to the same Erase Block will be simultaneously erased and it will need to be rewritten.


Humberto
asmallri



Joined: 12 Aug 2004
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Re: Block Length in MMC
PostPosted: Thu Jan 19, 2006 6:57 pm     Reply with quote
FGiordani wrote:
All MMC cards have 512 bytes block length only in one write/read cycle??

The default read block size is 512 bytes. The read block size is configurable via a command and can be anything from 1 to 512 bytes. The write block size is always 512 bytes and must start on a 512 byte boundary.
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