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Nonvolatile memory system and operating method of memory controller

  • US 9,355,738 B2
  • Filed: 06/02/2015
  • Issued: 05/31/2016
  • Est. Priority Date: 06/09/2014
  • Status: Active Grant
First Claim
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1. An operating method of a memory controller configured to control a nonvolatile memory device including a plurality of memory cells, the operating method comprising:

  • programming evaluation data into desired memory cells among the plurality of memory cells;

    performing charge loss evaluation on the desired memory cells after a time elapses from a time point when the evaluation data is programmed, the charge loss evaluation including an operation of detecting threshold voltage variation of the desired memory cells over a period based on the time elapsed from the time point when the evaluation data is programmed;

    storing a result of the charge loss evaluation; and

    adjusting levels of a plurality of read voltages used in the nonvolatile memory device based on the stored result of the charge loss evaluation.

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