SEMICONDUCTOR STORAGE DEVICE AND OPERATING METHOD OF SEMICONDUCTOR STORAGE DEVICE
A semiconductor storage device searches for an optimal read voltage on the basis of an error bit variance for each second read voltage interval without performing repeated additional reads up to the limit of left and right cell difference probabilities. Accordingly, the semiconductor storage device...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | A semiconductor storage device searches for an optimal read voltage on the basis of an error bit variance for each second read voltage interval without performing repeated additional reads up to the limit of left and right cell difference probabilities. Accordingly, the semiconductor storage device can detect an optimal read voltage rapidly and accurately by minimizing the number of reads for a memory cell, when performing a second read for determining the optimal read voltage. |
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