Method for storing and reading data in a multilevel nonvolatile memory, and architecture therefor
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United States of America Patent
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Nov 9, 2004
Grant Date -
Apr 24, 2003
app pub date -
Sep 26, 2002
filing date -
Sep 28, 2001
priority date (Note) -
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Abstract
According to the multilevel programming method, each memory location can be programmed at a non-binary number of levels. The bits to be stored in the two locations are divided into two sets, wherein the first set defines a number of levels higher than the non-binary number of levels. During programming, if the first set of bits to be written corresponds to a number smaller than the non-binary number of levels, the first set of bits is written in the first location and the second set of bits is written in the second location; if it is greater than the non-binary number of levels, the first set of bits is written in the second location and the second set of bits is written in the first location. The bits of the first set in the second location are stored in different levels with respect to the bits of the second set.
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