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资源说明：What Types of ECC Should Be Used on
Flash Memory?
1. Abstract
NOR Flash normally does not need ECC (Error-Correcting Code). 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 16 byte per 512 byte 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.
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