公开(公告)号：US20230342052A1

公开(公告)日：2023-10-26

申请号：US17725531

申请日：2022-04-20

Applicant: Silicon Motion, Inc.

Inventor： Ching-Ke Chen ,  Wei-Chih Hsu

IPC: G06F3/06

CPC classification number: G06F3/064 ,  G06F3/0658 ,  G06F3/0679 ,  G06F3/0659 ,  G06F3/0604

Abstract: The present invention provides a method for accessing a flash memory module, wherein the method includes the steps of: writing data into a plurality of pages of a specific block, and establishes or updates a F2H mapping table based on physical addresses of the plurality of pages and logical addresses of the data; using the F2H mapping table to update a H2F mapping table; initializing a flush-bitmap, wherein the flush-bitmap records a plurality of flush bits corresponding to the physical addresses of the plurality of pages, respectively; receiving a trim command from a host device, wherein the trim command asks to mark at least one of the logical addresses of the data as invalid; updating the H2F mapping data according to the trim command; updating the flush-bitmap according to the trim command; and writing the updated H2F mapping table and the updated flush-bitmap into the flash memory module.

公开(公告)号：US11947818B2

公开(公告)日：2024-04-02

申请号：US17725531

申请日：2022-04-20

Applicant: Silicon Motion, Inc.

Inventor： Ching-Ke Chen ,  Wei-Chih Hsu

IPC: G06F3/06 ,  G06F12/02 ,  G06F12/10

CPC classification number: G06F3/064 ,  G06F3/0658 ,  G06F3/0659 ,  G06F3/0679 ,  G06F12/0246 ,  G06F12/10 ,  G06F3/0604

Abstract: The present invention provides a method for accessing a flash memory module, wherein the method includes the steps of: writing data into a plurality of pages of a specific block, and establishes or updates a F2H mapping table based on physical addresses of the plurality of pages and logical addresses of the data; using the F2H mapping table to update a H2F mapping table; initializing a flush-bitmap, wherein the flush-bitmap records a plurality of flush bits corresponding to the physical addresses of the plurality of pages, respectively; receiving a trim command from a host device, wherein the trim command asks to mark at least one of the logical addresses of the data as invalid; updating the H2F mapping data according to the trim command; updating the flush-bitmap according to the trim command; and writing the updated H2F mapping table and the updated flush-bitmap into the flash memory module.