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States encoding in multi-bit flash cells for optimizing error rate

  • US 20050213393A1
  • Filed: 02/22/2005
  • Published: 09/29/2005
  • Est. Priority Date: 03/14/2004
  • Status: Abandoned Application
First Claim
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1. A method of storing N bits of data, comprising the steps of:

  • (a) providing ┌

    N/M┐

    cells, wherein M is at least 3; and

    (b) programming each cell with up to M of the bits according to a valid physical bit ordering, and according to a logical bit ordering that is different from said physical bit ordering and that distributes error probabilities of said up to M bits more evenly than said physical bit ordering.

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