REJUVENATION OF ANALOG MEMORY CELLS
First Claim
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1. A method for data storage, comprising:
- in a memory that includes multiple analog memory cells fabricated using respective physical media, identifying a group of the memory cells whose physical media have deteriorated over time below a given storage quality level;
applying to the identified group a rejuvenation process, which causes the physical media of the memory cells in the group to meet the given storage quality level; and
storing data in the rejuvenated group of the memory cells.
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Abstract
A method for data storage in a memory that includes multiple analog memory cells fabricated using respective physical media, includes identifying a group of the memory cells whose physical media have deteriorated over time below a given storage quality level. A rejuvenation process, which causes the physical media of the memory cells in the group to meet the given storage quality level, is applied to the identified group. Data is stored in the rejuvenated group of the memory cells.
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Citations
39 Claims
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1. A method for data storage, comprising:
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in a memory that includes multiple analog memory cells fabricated using respective physical media, identifying a group of the memory cells whose physical media have deteriorated over time below a given storage quality level; applying to the identified group a rejuvenation process, which causes the physical media of the memory cells in the group to meet the given storage quality level; and storing data in the rejuvenated group of the memory cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Apparatus for data storage, comprising:
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an interface for communicating with a memory that includes multiple analog memory cells fabricated using respective physical media; and circuitry, which is configured to identify a group of the memory cells whose physical media have deteriorated over time below a given storage quality level, to apply to the identified group a rejuvenation process, which causes the physical media of the memory cells in the group to meet the given storage quality level, and to store data in the rejuvenated group of the memory cells. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method for data storage, comprising:
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in a memory that includes multiple analog memory cells, storing data in a group of the analog memory cells by writing respective storage values into the memory cells in the group; estimating an integral of a temperature of the memory cells in the group over time; setting at least one read threshold for reading the memory cells in the group responsively to the estimated integral; and reading the analog storage values from the memory cells in the group using the at least one read threshold, so as to reconstruct the stored data.
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38. Apparatus for data storage, comprising:
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an interface for communicating with a memory that includes multiple analog memory cells; and circuitry, which is configured to store data in a group of the analog memory cells by writing respective storage values into the memory cells in the group, to estimate an integral of a temperature of the memory cells in the group over time, to set at least one read threshold for reading the memory cells in the group responsively to the estimated integral, and to read the analog storage values from the memory cells in the group using the at least one read threshold, so as to reconstruct the stored data.
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39. A method for data storage, comprising:
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operating a memory, which includes a plurality of analog memory cells and generates internal heat; heating at least some of the memory cells by applying to the memory external heat, in addition to the internal heat generated by the memory; and storing data in the heated memory cells.
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Specification