Enhanced error correction in memory devices

摘要

A method of correcting stored data includes reading data stored in a portion of a nonvolatile memory. The method includes, for each particular bit position of the read data, updating a count of data error instances associated with the particular bit position in response to detecting that the read data differs from a corresponding reference value of the particular bit position. The reading of the first portion and the updating of the counts of data error instances are performed for a particular number of repetitions. The method includes identifying each bit position having an associated count of data error instances equal to the particular number of repetitions as a recurring error bit position.

主权项

1. A method comprising:
repeatedly reading and checking data stored in a portion of a nonvolatile memory, wherein the data is stored in memory elements located at a plurality of bit positions in the portion of the nonvolatile memory, wherein repeatedly reading and checking the data includes performing a particular number of repetitions of:
reading a bit value of a bit position;comparing the read bit value to a reference value of the bit position to determine whether the read bit value is different from the reference value; andupdating a count of data error instances associated with the bit position in response to detecting that the read bit value differs from the reference value of the bit position; and identifying each particular bit position having an associated count of data error instances equal to the particular number of repetitions as a recurring error bit position.