Patent ID: 11923029
Assignee: KIOXIA CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 9:
10. The memory system according to claim 7, wherein
the non-volatile memory device includes a plurality of word lines to which a plurality of memory cells is connected,
a first page, a second page, and a third page are allocated to each of the word lines,
each of the memory cells has any one threshold voltage state of a first threshold voltage state, a second threshold voltage state, a third threshold voltage state, a fourth threshold voltage state, a fifth threshold voltage state, a sixth threshold voltage state, a seventh threshold voltage state, and an eighth threshold voltage state in ascending order of voltages,
when the first data belongs to the first page, the controller is configured to
read the first data using a fourth level between the first threshold voltage state and the second threshold voltage state and a fifth level between the fifth threshold voltage state and the sixth threshold voltage state,
read fifth data using a sixth level between the third threshold voltage state and the fourth threshold voltage state, and
determine the read level using the first frame data before the correction process, the first frame data after the correction process, and the fifth data.