Generating soft decoding information for flash memory error correction using hard decision patterns
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United States of America Patent
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Nov 17, 2015
Grant Date -
Apr 23, 2015
app pub date -
Oct 28, 2013
filing date -
Oct 17, 2013
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Abstract
A flash memory controller having soft-decoding error correcting code (ECC) logic generates log likelihood ratio or similar ECC decoder soft input information from decision patterns obtained from reading data from the same portion of flash memory two or more times. Each decision pattern corresponds to a voltage region bordering one of the reference voltages. Each decision pattern represents a combination of flash memory bit value decisions for a cell voltage within the voltage region corresponding to the decision pattern when a corresponding combination of the reference voltages are used to read the cell. Numerical values are then computed in response to combinations of the flash memory bit value decisions represented by the decision patterns. The numerical values are provided to the soft-decoding ECC logic to serve as soft input information.
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