Multi-bit-per-cell flash memory device with non-bijective mapping
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United States of America Patent
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Jan 5, 2010
Grant Date -
Nov 27, 2008
app pub date -
Mar 11, 2008
filing date -
Mar 6, 2006
priority date (Note) -
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Abstract
To store a plurality of input bits, the bits are mapped to a corresponding programmed state of one or more memory cells and the cell(s) is/are programmed to that corresponding programmed state. The mapping may be many-to-one or may be an “into” generalized Gray mapping. The cell(s) is/are read to provide a read state value that is transformed into a plurality of output bits, for example by maximum likelihood decoding or by mapping the read state value into a plurality of soft bits and then decoding the soft bits.
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