Patent ID: 9164881
Filing Date: 2015-10-20
Classification: G06F,G11C

Abstract:
1. A method of determining a deterioration condition of a memory device, the method comprising: calculating first information corresponding to a number of bits having a first logic value from data obtained by performing a first read operation on a target storage region of the memory device using a first reference voltage as a read voltage; calculating second information corresponding to a number of bits having a second logic value, from data obtained by performing a second read operation on the target storage region of the memory device using a second reference voltage as the read voltage; and determining a deterioration condition of the target storage region of the memory device based on the calculated first information and the calculated second information, wherein the first reference voltage is less than a first read voltage by which an erase state of the memory device is distinguished from a program state adjacent to the erase state, and the second reference voltage is higher than the first read voltage, and wherein determining of the deterioration condition comprises: applying the calculated first information and the calculated second information to a predetermined equation and performing a calculation process; and determining the type of deterioration condition of the target storage region of the memory device based on a result of the calculation process, wherein the predetermined equation is obtained to discriminate among the plurality of types of deterioration conditions based on a distribution of experimentally measured first information and experimentally measured second information.