公开(公告)号：US20180004415A1

公开(公告)日：2018-01-04

申请号：US15423629

申请日：2017-02-03

Applicant: HEEWON LEE ,  SARI GO ,  SEUNGKYUNG RO ,  SEONGNAM KWON

Inventor： HEEWON LEE ,  SARI GO ,  SEUNGKYUNG RO ,  SEONGNAM KWON

IPC: G06F3/06 ,  G11C16/10 ,  G11C16/16 ,  G11C16/04 ,  G11C16/34 ,  G11C16/26

CPC classification number: G11C16/3418 ,  G06F3/0679 ,  G11C7/04 ,  G11C16/0483 ,  G11C16/26 ,  G11C16/3422 ,  G11C16/3427 ,  G11C16/3431 ,  G11C16/349 ,  G11C16/3495

Abstract: A storage device includes a nonvolatile memory device and a controller. The nonvolatile memory device includes multiple memory blocks, each of which includes memory cells. The controller reads data from selected memory cells of a memory block selected from the memory blocks during a read operation. The selected memory cells correspond to both a word line and a string selection line selected as a read target. The controller increases a read count by a read weight corresponding to the selected word line and string selection line of the selected memory block, and performs a refresh operation on the selected memory cells if the read count reaches a threshold value. In the selected memory block, two or more read weights are assigned according to locations of the string selection lines and the word lines.

公开(公告)号：US10049755B2

公开(公告)日：2018-08-14

申请号：US15423629

申请日：2017-02-03

Applicant: Heewon Lee ,  Sari Go ,  Seungkyung Ro ,  Seongnam Kwon

Inventor： Heewon Lee ,  Sari Go ,  Seungkyung Ro ,  Seongnam Kwon

IPC: G11C16/34 ,  G06F3/06 ,  G11C16/04

Abstract: A storage device includes a nonvolatile memory device and a controller. The nonvolatile memory device includes multiple memory blocks, each of which includes memory cells. The controller reads data from selected memory cells of a memory block selected from the memory blocks during a read operation. The selected memory cells correspond to both a word line and a string selection line selected as a read target. The controller increases a read count by a read weight corresponding to the selected word line and string selection line of the selected memory block, and performs a refresh operation on the selected memory cells if the read count reaches a threshold value. In the selected memory block, two or more read weights are assigned according to locations of the string selection lines and the word lines.