Memory devices, and operation method thereof, memory systems

A method of operating a memory device, comprising:

• in response to powering up again after a power down during a second program operation, determining a second memory state corresponding to the second program operation according to data in a first memory state after a first program operation and identification information, wherein the identification information is to represent the second memory state corresponding to the second program operation,
• a memory cell in the memory device is programmed to the first memory state after the first program operation is performed, and the data in the first memory state is programmed to the second memory state after the second program operation is performed;
• and
• reperforming the second program operation, such that the memory cell is programmed to the second memory state.

A memory system, comprising:

• a memory device comprising memory cells, wherein a memory cell of the memory cells is programmed to a first memory state after a first program operation is performed, and data in the first memory state is programmed to a second memory state after a second program operation is performed;
• and
• a memory controller coupled with the memory device and configured to:
• in response to powering up again after a power down during the second program operation, determine the second memory state corresponding to the second program operation according to identification information and the data in the first memory state after the first program operation, wherein the identification information is to represent the second memory state corresponding to the second program operation;
• and
• control the memory device to reperform the second program operation, such that the memory cell is programmed to the second memory state.