Method of managing a multi-bit-cell flash memory
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United States of America Patent
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Sep 20, 2011
Grant Date -
May 29, 2008
app pub date -
Oct 25, 2007
filing date -
Apr 23, 2004
priority date (Note) -
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Abstract
A flash memory is managed by reserving one or more cells as flag cells to represent the number N of bits to store in the cells of a memory block, selecting the value of N from at least three candidates, and programming the flag cell(s) to represent the selected value. A flash memory is managed by selecting a value of the number N>2 of bits to store in the cells of a portion (e.g. a block or page) of the memory, reserving one other cell of the memory as a flag cell to represent how many bits actually are stored in each cell of the portion, and, as the cells of the portion are successively programmed with 1≦n≦N bits, programming the flag cell to represent n.
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