Use of alternative value in cell detection
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United States of America Patent
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Jan 15, 2013
Grant Date -
Jun 21, 2012
app pub date -
Feb 27, 2012
filing date -
May 15, 2006
priority date (Note) -
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Abstract
A system and method, including computer software, allows reading data from a flash memory cell. Voltages from a group of memory cells are detected. The group of memory cells have associated metadata for error detection, and each memory cell stores a voltage representing a data value selected from multiple possible data values. Each possible data value corresponds to one range of multiple non-overlapping ranges of analog voltages. Memory cells having uncertain data values are identified based on the detected voltages. Alternative data values for the memory cells having the uncertain data values are determined, and a combination of alternative data values is selected. An error detection test is performed using the metadata associated with the multiple memory cells and the selected combination of alternative data values.
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