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:
May. 26, 2015
Filed:
Oct. 09, 2012
Sharp Kabushiki Kaisha, Osaka, JP;
Elpida Memory, Inc., Tokyo, JP;
Mitsuru Nakura, Osaka, JP;
Nobuyoshi Awaya, Osaka, JP;
Kazuya Ishihara, Osaka, JP;
Akiyoshi Seko, Tokyo, JP;
Sharp Kabushiki Kaisha, Osaka-shi, Osaka, JP;
Abstract
A semiconductor memory device includes a writing circuit and a reading circuit. The writing circuit executes a setting action for converting a resistance of a variable resistance element to a low resistance by applying current from one end side to the other end side of a memory cell via the variable resistance element, and a resetting action for converting the resistance to a high resistance by applying current from the other end side to the one end side via the variable resistance element. The reading circuit executes a first reading action for reading a resistance state of the variable resistance element by applying current from one end side to the other end side of the memory cell via the variable resistance element, and a second reading action for reading the resistance state by applying current from the other end side to the one end side via the variable resistance element.