Programming schemes for multi-level analog memory cells
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United States of America Patent
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Sep 4, 2012
Grant Date -
Feb 12, 2009
app pub date -
Aug 6, 2008
filing date -
Aug 6, 2007
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Abstract
A method for data storage includes storing first data bits in a set of multi-bit analog memory cells at a first time by programming the memory cells to assume respective first programming levels. Second data bits are stored in the set of memory cells at a second time that is later than the first time by programming the memory cells to assume respective second programming levels that depend on the first programming levels and on the second data bits. A storage strategy is selected responsively to a difference between the first and second times. The storage strategy is applied to at least one group of the data bits, selected from among the first data bits and the second data bits.
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