公开(公告)号：US20230096401A1

公开(公告)日：2023-03-30

申请号：US17694057

申请日：2022-03-14

申请人： Kioxia Corporation

发明人： Masahiro KIYOOKA ,  Riki SUZUKI ,  Yoshihisa KOJIMA

IPC分类号： H03M13/11 ,  H03M13/09 ,  G11C11/4096 ,  G11C11/4074

摘要： A memory system according to an embodiment includes a nonvolatile memory and a memory controller. The nonvolatile memory includes a plurality of memory cells. The memory controller is configured to control the nonvolatile memory. In read operation for the memory cells, the memory controller is configured to: perform tracking including a plurality of reads in which a read voltage is shifted; determine a hard bit read voltage based on results of the tracking; calculate a soft bit read voltage based on the determined hard bit read voltage; perform soft bit read using the calculated soft bit read voltage; and perform a soft bit decoding process using a result of the soft bit read and a log-likelihood ratio table associated with the calculated soft bit read voltage.