Read operation for non-volatile storage that includes compensation for coupling
First Claim
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1. A method for using non-volatile storage elements, comprising:
- programming a first non-volatile storage elements and a second set of non-volatile storage elements, said first set of non-volatile storage elements and said second set of non-volatile storage elements each store first and second groupings of data, said programming includes writing to a particular non-volatile storage element with respect to said second grouping of data subsequent to writing to adjacent non-volatile storage elements for said first grouping of data;
reading charge information from said second set of non-volatile storage elements; and
performing a read operation on said first set of non-volatile storage elements, said read operation uses a first compensation for non-volatile storage elements of said first set of non-volatile storage elements adjacent to non-volatile storage elements of said second set of non-volatile storage elements that have charge information read which provide a first indication and said read operation does not use said first compensation for non-volatile storage elements of said first set of non-volatile storage elements adjacent to non-volatile storage elements of said second set of non-volatile storage elements that have charge information read which does not provide said first indication.
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Abstract
Shifts in the apparent charge stored on a floating gate (or other charge storing element) of a non-volatile memory cell can occur because of the coupling of an electric field based on the charge stored in adjacent floating gates (or other adjacent charge storing elements). The problem occurs most pronouncedly between sets of adjacent memory cells that have been programmed at different times. To compensate for this coupling, the read process for a given memory cell will take into account the programmed state of an adjacent memory cell.
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Citations
7 Claims
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1. A method for using non-volatile storage elements, comprising:
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programming a first non-volatile storage elements and a second set of non-volatile storage elements, said first set of non-volatile storage elements and said second set of non-volatile storage elements each store first and second groupings of data, said programming includes writing to a particular non-volatile storage element with respect to said second grouping of data subsequent to writing to adjacent non-volatile storage elements for said first grouping of data; reading charge information from said second set of non-volatile storage elements; and performing a read operation on said first set of non-volatile storage elements, said read operation uses a first compensation for non-volatile storage elements of said first set of non-volatile storage elements adjacent to non-volatile storage elements of said second set of non-volatile storage elements that have charge information read which provide a first indication and said read operation does not use said first compensation for non-volatile storage elements of said first set of non-volatile storage elements adjacent to non-volatile storage elements of said second set of non-volatile storage elements that have charge information read which does not provide said first indication. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification