Patent ID: 11915770
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method of reducing reliability degradation of a nonvolatile memory device that includes a plurality of memory cells connected to a plurality of wordlines, the method comprising:
providing the nonvolatile memory device in which initial data having an initial threshold voltage distribution is stored in the plurality of memory cells connected to the plurality of wordlines;
before a first process is performed on the nonvolatile memory device, performing a first write operation such that first data having a first threshold voltage distribution is stored into memory cells connected to first wordlines, the first process being a process that causes reliability degradation of the plurality of memory cells, the first threshold voltage distribution being different from the initial threshold voltage distribution, the first wordlines having a degree of reliability degradation less than a reference value among the plurality of wordlines; and
before the first process is performed on the nonvolatile memory device, performing a second write operation such that second data having a second threshold voltage distribution is stored into memory cells connected to second wordlines, the second threshold voltage distribution being different from the first threshold voltage distribution, the second wordlines having a degree of reliability degradation greater than or equal to the reference value among the plurality of wordlines.