MULTIPLE-VALUED MEMORY AND DATA ACCESS METHOD FOR MULTIPLE-VALUED MEMORY

摘要

The present invention relates to a multi-value memory and a data access method for a multi-value memory, and to improve the reliability of read data by enabling highly reliable data error correction even if there is some problem in the threshold control method and data retention characteristics. The purpose.;It is possible to maintain an analog quantity which can be divided into a plurality of levels according to the size, and have a plurality of memory cells capable of storing three or more logical values according to the level of the analog quantity to be maintained, and the analog quantity of the i th level and the i + 1 th The analog amount held by the memory cell and the logic value stored in the memory cell correspond to each other so that the hamming distance between two logic values corresponding to each of the analog amounts of the level becomes one.