NONVOLATILE MEMORY DEVICE AND NONVOLATILE MEMORY SYSTEM AND RANDOM DATA READ METHOD THEREOF

摘要

PURPOSE: A nonvolatile memory device, a nonvolatile memory system, and a random data reading method thereof are provided to improve reliability by suppressing the variation of threshold voltages of memory cells. CONSTITUTION: An array includes memory cells which are arranged in rows and columns. A randomizing and de-randomizing circuit(600a) randomizes data stored in the array, generates a seed in reference to position information of the random data and an initial seed of a page including read requested random data in a random read operation, and de-randomizes the random data by applying a random sequence generated from the seed. A seed converter(611) converts the initial seed into finite field element. A location table(613) stores the location information of a sector.