文件名称：Nand Flash ECC
文件大小：177KB
文件格式：PDF
更新时间：2017-03-09 09:16:22
NandFlash ECC
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.