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APPARATUS AND METHODS FOR GENERATING ROW-SPECIFIC READING THRESHOLDS IN FLASH MEMORY

  • US 20100131809A1
  • Filed: 09/17/2008
  • Published: 05/27/2010
  • Est. Priority Date: 12/05/2007
  • Status: Active Grant
First Claim
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1. A method for generating a set of at least one row-specific reading threshold for reading at least portions of pages of data within an erase sector of a flash memory device, the method comprising:

  • predetermining at least one initial reading threshold;

    performing the following steps for at least one current logical page;

    generating bit error characterizing information regarding at least one corresponding bit error within at least one cell representing at least a logical portion of at least one successfully reconstructed previous logical page; and

    computing at least one row-specific reading threshold based on said bit error characterizing information and on a previous threshold initially comprising said initial threshold and subsequently comprising a row-specific reading threshold computed for a successfully reconstructed previous logical page; and

    reading at least a portion of said current logical page using said at least one row-specific reading threshold.

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