The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 2019
Filed:
Feb. 26, 2018
Applicant:
Toshiba Memory Corporation, Tokyo, JP;
Inventor:
Naoki Shimizu, Kawasaki Kanagawa, JP;
Assignee:
TOSHIBA MEMORY CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 7/22 (2006.01); G11C 13/00 (2006.01);
U.S. Cl.
CPC ...
G11C 13/0069 (2013.01); G11C 13/004 (2013.01); G11C 13/0064 (2013.01); G11C 2013/0045 (2013.01); G11C 2013/0066 (2013.01); G11C 2013/0083 (2013.01);
Abstract
According to one embodiment, a semiconductor memory device includes a nonvolatile memory comprising a plurality of memory cells, and a controller configured to perform, a preliminary write process of writing reverse data into a first memory cell, and a main write process of writing correct data in the first memory cell, when the first memory cell is in a weak bit state, wherein a condition of the preliminary write process is different from a condition of the main write process.