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FAT Question

 
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cfernandez



Joined: 18 Oct 2003
Posts: 145

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FAT Question
PostPosted: Sun Mar 22, 2009 8:17 pm     Reply with quote
Hi,

I want to use the FAT driver from CCS with a ATMEL dataflash, anybody make this?, Is possible?

Thank you very much!
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Mon Mar 23, 2009 12:15 am     Reply with quote
It should be usable (with some adaptions). Basically FAT can be used with any block addressable media. But you must observe this DataFlash requirement:
Quote:
To preserve data integrity, each page of a DataFlash sector must be updated/rewritten at least once within every 10,000 cumulative page erase/program operations.

A simple algorithm is suggested in the datasheet, but it requires a non-volatile page pointer.

P.S.: I noticed, that newer DataFlash datasheets are using the term endurance, which has been apparently unknown at Atmel in the past. They specify 100k erase/write cycles at minimum. It's doubtful, if DataFlash should be used without a wear-leveling flash translation layer for FAT, that is permanently to some sectors (directory and FAT).
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