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What types of ECC should be used on flash memory?

Posted: 30 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:NOR flash? error-correcting code? Hamming codes?

NOR flash normally does not need error-correcting code (ECC). On the other hand, NAND requires ECC to ensure data integrity. NAND flash includes extra storage on each page to store ECC code as well as other information for wear leveling, logical to physical block mapping, and other software overhead functions. The size of extra storage (spare area) is normally 16byte per 512byte sector but other sizes are also used. ECC algorithm correction strength (number of bit errors that can be corrected) depends on the ECC algorithm used to correct the errors (these algorithms may be implemented in either hardware or software). Simple Hamming codes can only correct single bit errors. Reed-Solomon code can correct more errors and is used on many of the current controllers. BCH (Bose, Ray-Chaudhuri, Hocquenghem) codes can also correct multiple bit errors and are becoming popular because of their improved efficiency over Reed-Solomon. Read on this application note from Spansion to understand more.

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