Pattern-sensitive coding of data for storage in multi-level memory cells
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United States of America Patent
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Mar 4, 2014
Grant Date -
Nov 24, 2011
app pub date -
Oct 8, 2009
filing date -
Dec 31, 2008
priority date (Note) -
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Abstract
A method of operating a memory device includes receiving first and second sets of bits to be stored in multi-level cells in the device. A multi-level encoding is selected from among a plurality of multi-level encodings for storing the first and second sets of bits in the multi-level cells. Each multi-level encoding includes at least four encoding levels for a respective multi-level cell. Respective multi-level encodings have respective costs associated with programming the first and second sets of bits into the multi-level cells in accordance with the respective multi-level encodings. The multi-level encoding is selected based on the respective costs of the respective encodings. The first and second sets of bits are encoded in accordance with the selected multi-level encoding to produce encoded data for storage in the device such that a respective multi-level cell stores respective bits from both the first and second sets of bits.
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