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    Memory system and method of controlling nonvolatile memory
    1.
    发明授权
    Memory system and method of controlling nonvolatile memory 有权

    公开(公告)号：US12236106B2

    公开(公告)日：2025-02-25

    申请号：US17941388

    申请日：2022-09-09

    Applicant: Kioxia Corporation

    Inventor： Shinichi Kanno ,  Yuki Sasaki

    IPC: G06F3/06

    Abstract: According to one embodiment, a controller of a memory system writes, in response to receiving from the host a write command specifying a logical address, data received from the host to a first write destination block. The controller manages a first list and first storage location information, the first list including a plurality of logical addresses corresponding respectively to write-uncompleted data, and the first storage location information indicating a storage location at a beginning of a write-uncompleted region in the first write destination block. In a case where a power loss has occurred without notice from the host, the controller writes the first list and the first storage location information to the nonvolatile memory using power from a capacitor.

    Memory system and method of controlling nonvolatile memory
    2.
    发明授权
    Memory system and method of controlling nonvolatile memory 有权

    公开(公告)号：US12229448B2

    公开(公告)日：2025-02-18

    申请号：US18449924

    申请日：2023-08-15

    Applicant: KIOXIA CORPORATION

    Inventor： Shinichi Kanno

    IPC: G06F3/06

    Abstract: According to one embodiment, a controller of a memory system executes a first write operation of writing write data into a first storage region, in response to reception of one or more write requests for specifying a first zone from a host, during a period from execution of an erase operation of the first storage region until a first time elapses. When the first time has elapsed after execution of the erase operation, in a state in which an unwritten region having a size larger than or equal to a first size remains in the first storage region, the controller does not execute the first write operation, allocates the first storage region as a nonvolatile buffer capable of temporarily storing write data to be written to each of a plurality of zones.

    Memory system and information processing system
    3.
    发明授权
    Memory system and information processing system 有权

    公开(公告)号：US12222857B2

    公开(公告)日：2025-02-11

    申请号：US18457672

    申请日：2023-08-29

    Applicant: KIOXIA CORPORATION

    Inventor： Yuki Sasaki ,  Shinichi Kanno ,  Takahiro Kurita

    IPC: G06F12/02 ,  G06F12/1009

    Abstract: According to one embodiment, a memory system includes a non-volatile memory and a data map configured to manage validity of data written in the non-volatile memory. The data map includes a plurality of first fragment tables corresponding to a first hierarchy and a second fragment table corresponding to a second hierarchy higher than the first hierarchy. Each of the first fragment tables is used to manage the validity of each data having a predetermined size written in a range of physical address in the non-volatile memory allocated to the first fragment table. The second fragment table is used for each of the first fragment tables to manage reference destination information for referencing the first fragment table.

    Memory system changing write mode and method of controlling nonvolatile memory by changing write mode
    4.
    发明授权
    Memory system changing write mode and method of controlling nonvolatile memory by changing write mode 有权

    公开(公告)号：US12147333B2

    公开(公告)日：2024-11-19

    申请号：US18303863

    申请日：2023-04-20

    Applicant: KIOXIA CORPORATION

    Inventor： Shinichi Kanno ,  Naoki Esaka

    IPC: G06F12/02 ,  G06F12/08 ,  G06F12/0868 ,  G06F12/0871 ,  G06F13/16 ,  G06F13/40

    Abstract: According to one embodiment, a controller of a memory system writes write data associated with a set of received write requests to a first write destination storage region in a first write mode of writing a plurality of bits per memory cell, without writing the write data to a second storage region. When receiving from a host a first request to cause a state of the first write destination storage region to transition to a second state in which writing is suspended, the controller transfers un-transferred remaining write data from a write buffer of the host to an internal buffer, and writes the remaining write data to the second storage region in a second write mode of writing 1 bit per memory cell.

    Memory system and method of controlling nonvolatile memory
    5.
    发明授权
    Memory system and method of controlling nonvolatile memory 有权

    公开(公告)号：US12135903B2

    公开(公告)日：2024-11-05

    申请号：US18347905

    申请日：2023-07-06

    Applicant: KIOXIA CORPORATION

    Inventor： Shinichi Kanno

    IPC: G06F3/06

    Abstract: According to one embodiment, a memory system manages a plurality of first weights that correspond to the plurality of queues, and a plurality of second weights that correspond to the plurality of queues. The memory system selects a queue of a largest or smallest second weight, of the plurality of queues, as a queue of a highest priority, and starts execution of a command stored in the selected queue. The memory system updates the second weight corresponding to the selected queue by subtracting the first weight corresponding to the selected queue from the second weight corresponding to the selected queue or by adding the first weight corresponding to the selected queue to the second weight corresponding to the selected queue.

    Memory system and method of controlling nonvolatile memory and for reducing a buffer size
    6.
    发明授权
    Memory system and method of controlling nonvolatile memory and for reducing a buffer size 有权

    公开(公告)号：US12014090B2

    公开(公告)日：2024-06-18

    申请号：US18301694

    申请日：2023-04-17

    Applicant: KIOXIA CORPORATION

    Inventor： Shinichi Kanno

    IPC: G06F3/06

    CPC classification number: G06F3/0659 ,  G06F3/0604 ,  G06F3/0656 ,  G06F3/0679

    Abstract: According to one embodiment, a memory system determines, for each of groups corresponding to streams, whether or not a length of write data associated with a set of write commands belonging to a same group reaches a minimum write size of a nonvolatile memory. When a length of write data associated with a set of write commands belonging to a first group corresponding to a first stream reaches the minimum write size, the memory system transfers the write data associated with the set of write commands belonging to the first group from a write buffer in a memory of the host to a first buffer in the memory system, and writes the write data transferred to the first buffer to a first write destination block corresponding to the first stream.

    Memory system
    9.
    发明授权
    Memory system 有权

    公开(公告)号：US11861202B2

    公开(公告)日：2024-01-02

    申请号：US17468163

    申请日：2021-09-07

    Applicant: Kioxia Corporation

    Inventor： Naoki Esaka ,  Shinichi Kanno

    IPC: G06F3/06

    CPC classification number: G06F3/0644 ,  G06F3/0604 ,  G06F3/0659 ,  G06F3/0679

    Abstract: According to one embodiment, a memory system includes a nonvolatile memory and a controller. The controller receives a first write request associated with first data from a host. In response to a lapse of first time since the reception of the first write request, the controller starts a write process of second data to the nonvolatile memory. The second data includes at least the first data. The controller transmits a first response to the first write request to the host in response to completion of the write process. The first time is time obtained by subtracting second time from third time designated by the host as a time limit of the transmission of the first response since the reception of the first write request.

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