Patent ID: 11928338
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 19:
20. A method of measuring durability of a nonvolatile memory device that includes a plurality of memory blocks, the method comprising:
at a first time point, receiving a first read command for a first memory block among the plurality of memory blocks;
at the first time point, performing a first read operation on first memory cells among a plurality of memory cells included in the first memory block based on a first read voltage, the first memory cells connected to a first wordline, the first wordline being determined in advance of the method of measuring durability of a nonvolatile memory device;
at the first time point, generating a first cell count value associated with the first memory cells based on a result of the first read operation to output the first cell count value;
at a second time point at which a first time interval is elapsed from the first time point, receiving a second read command for the first memory block;
at the second time point, performing a second read operation on the first memory cells based on the first read voltage;
at the second time point, generating a second cell count value associated with the first memory cells based on a result of the second read operation to output the second cell count value;
obtaining a first durability value associated with the first memory block based on the first cell count value and the second cell count value; and
storing the first durability value in response to a reception of the first durability value,
wherein the first durability value corresponds to a change in a number of on-cells among the first memory cells, and the on-cells represent memory cells having a threshold voltage lower than the first read voltage among the first memory cells.