MEMORY CONTROLLER FOR NONVOLATILE MEMORY, NONVOLATILE STORAGE DEVICE, NONVOLATILE STORAGE SYSTEM, AND CONTROL METHOD OF NONVOLATILE MEMORY

摘要

PROBLEM TO BE SOLVED: To provide a means for detecting and refreshing a bit error of a nonvolatile memory with a simple structure and to improve the reliability of a nonvolatile storage device and a nonvolatile storage system.

SOLUTION: In writing data in the nonvolatile memory, an error correction code is added to the data. In reading target data from the nonvolatile memory, another area selected at random is also read, the number of errors is counted, and when the number of errors exceeds a reference value, refresh information is stored in the nonvolatile memory, and when the refresh information exists during initialization, refresh processing is executed.

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