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

Claim 16:
17. A nonvolatile memory device comprising:
a memory cell array including a plurality of memory cells connected to a plurality of wordlines; and
a control circuit configured to control an operation of the memory cell array, wherein the control circuit is configured to
provide 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, perform 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, perform 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.