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Error correcting circuit for making efficient error correction, and involatile semiconductor memory device incorporating the same error correcting circuit
Error correcting circuit for making efficient error correction, and involatile semiconductor memory device incorporating the same error correcting circuit
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机译:用于有效地进行纠错的纠错电路以及具有该纠错电路的非易失性半导体存储装置
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摘要
This invention provides a nonvolatile semiconductor memory device capable of avoiding complicatedness of algorithm for normal write operation and a write operation prior to erasing in a memory system in which the distribution of threshold of cells after erasing is adjusted. This nonvolatile semiconductor memory device generates check bits as error correction code according to a check bit generating matrix so formed that in both the normal write operation and the write operation prior to erasing, the factors of “1” of respective rows satisfy the quantity absolutely necessary for generating check bits and the quantity of the factors of “1” is an odd number.
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