公开(公告)号：US20230251928A1

公开(公告)日：2023-08-10

申请号：US17895465

申请日：2022-08-25

Applicant: KIOXIA CORPORATION

Inventor： Yuki MANDAI ,  Shuou NOMURA ,  Ryo YAMAKI ,  Toshikatsu HIDA

IPC: G06F11/10 ,  G11C16/08 ,  G11C16/26

CPC classification number: G06F11/1024 ,  G11C16/08 ,  G11C16/26

Abstract: A memory system includes a nonvolatile memory including memory cells, and a memory controller. The memory controller is configured to read first data through application of a first read voltage to each of the memory cells, perform a first decoding process with respect to the first data, when the first decoding process fails, perform a tracking process. The tracking process includes reading second data indicating a threshold voltage level of each of the memory cells through application of a plurality of second read voltages to each of the memory cells, and obtaining, with respect to each of the memory cells, likelihood information using the second data. The second read voltages are shifted by a predetermined amount. The memory controller is further configured to perform a second decoding process with respect to the second data using the likelihood information.

公开(公告)号：US20220357892A1

公开(公告)日：2022-11-10

申请号：US17815326

申请日：2022-07-27

Applicant: Kioxia Corporation

Inventor： Hirotsugu KAJIHARA ,  Kazuhiro HIWADA ,  Shuou NOMURA ,  Tomoya SUZUKI ,  Shintaro SANO

IPC: G06F3/06

Abstract: A storage system is provided, including: a host including a memory, the memory including a submission queue and a completion queue and being configured to store update frequency information; and a memory system configured to be connectable with the host and including a nonvolatile memory and a controller, the controller configured to control the nonvolatile memory, to receive the update frequency information of the submission queue from the host, to read command information stored in the submission queue based on the received update frequency information, and to execute controlling for the nonvolatile memory based on the command information.