Programming method for multi-level cell flash for minimizing inter-cell interference
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United States of America Patent
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Aug 26, 2014
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app pub date -
Jul 6, 2012
filing date -
Sep 14, 2009
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Abstract
Systems, methods and computer program products for minimizing floating gate coupling interference and threshold voltage drift associated with flash memory cells are described. In some implementations, the memory cells can be programmed in a predetermined sequence that allows pages with the most-significant bit (MSB) and central significant bit (CSB) to be programmed first prior to programming pages with the least-significant bit (LSB). This sequence allows neighboring cells (e.g., cells neighboring a target cell) to be programmed first so as to reduce the floating gate coupling interference and threshold voltage drift on the target cell that is to be programmed in the subsequent stage. To accommodate the programming sequence (e.g., at the device level), additional buffer memories can be added.
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