Memory system including a memory controller and a memory chip that executes a two-stage program operation

    公开(公告)号:US11430520B2

    公开(公告)日:2022-08-30

    申请号:US16802428

    申请日:2020-02-26

    Abstract: In connection with a write operation, a memory controller transmits a first command sequence to a memory chip, thereby causing the memory chip to execute a first-stage program operation that includes a first operation and a first part of a second operation after the first operation, and a second command sequence to the memory chip after the first-stage program operation is executed, thereby causing the memory chip to execute a second-stage program operation that includes a second part of the second operation and no part of the first operation. During the first operation, a program voltage is applied a plurality of times while increasing the program voltage each of the times by a first step size. During the second operation, the program voltage is applied a plurality of times while increasing the program voltage each of the times by a second step size smaller than the first step size.

    Memory system
    7.
    发明授权

    公开(公告)号:US12117902B2

    公开(公告)日:2024-10-15

    申请号:US18324226

    申请日:2023-05-26

    Abstract: According to an embodiment, a memory controller obtains first data in a first page using a first voltage, obtains a first shift amount based on a first and second number. The first and second numbers represent numbers of bits each of which has different values in a first and second manner between the first data and first expected data. The controller obtains second data in the second page using a second voltage and a second shift amount, and obtains a third shift amount based on a third and fourth number, the third and fourth numbers respectively represent numbers of bits each of which has different values in the first and second manner between the second data and second expected data.

    Memory system
    8.
    发明授权

    公开(公告)号:US11923029B2

    公开(公告)日:2024-03-05

    申请号:US18180944

    申请日:2023-03-09

    Abstract: According to one embodiment, a memory system includes: a controller configured to execute an error correction process on first data read from a first area at a first address of a memory device and determine a read level used for reading data at the first address according to a result of the correction process. The controller executes the correction process on first frame data of the first data. When the correction process on the first frame data has failed, the controller executes the correction process on second frame data of the first data. When the correction process on the second frame data has succeeded, the controller determines the read level based on a result of comparison between the second frame data and a result of the correction process on the second frame data.

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