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System, method and computer program product for joint search of a read threshold and soft decoding

  • US 8,990,665 B1
  • Filed: 03/14/2012
  • Issued: 03/24/2015
  • Est. Priority Date: 04/06/2011
  • Status: Active Grant
First Claim
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1. A method comprising:

  • performing, by a flash memory controller, multiple read attempts of a group of flash memory cells, using multiple read thresholds, to provide multiple read results;

    determining, by the flash memory controller and based upon the multiple read results, a reliability metric of each of the multiple read results;

    error correction decoding the multiple read results based upon reliability metrics associated with the multiple read results; and

    evaluating a characteristic of the multiple read results under different assumptions about mapping between the read thresholds and reliability metrics;

    wherein an evaluating of the characteristic of the multiple read thresholds under each assumption comprises comparing between (a) a relationship between numbers of first and second read results of the multiple read results and of different values, and (b) an expected relationship between numbers of first and second read results of different numbers.

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