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Adaptive read threshold voltage tracking with separate characterization on each side of voltage distribution about distribution mean
Adaptive read threshold voltage tracking with separate characterization on each side of voltage distribution about distribution mean
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机译:自适应读取阈值电压跟踪,在分布平均值的两端均具有独立的特征
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摘要
Methods and apparatus are provided for adaptive read threshold voltage tracking with separate characterization on each side of a voltage distribution about a distribution mean. A read threshold voltage for a memory is adjusted by determining statistical characteristics of two adjacent memory levels based at least in part on a type of statistical distribution of the memory levels and a distribution of data values read from cells using a plurality of read threshold voltages, wherein the statistical characteristics of the two adjacent memory levels are characterized independently on two sides about at least one mean of the statistical distribution; computing an adjusted read threshold voltage associated with the two adjacent memory levels by using the statistical characteristics of the two adjacent memory levels; and updating the read threshold voltage based on the adjusted read threshold voltage. The adjustment is optionally performed responsive to one or more read errors.
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