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:
Feb. 29, 2000
Filed:
Jul. 29, 1998
Koji Sakui, Tokyo, JP;
Junichi Miyamoto, Yokohama, JP;
Kenichi Imamiya, Kawasaki, JP;
Kei Takano, Chigasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, US;
Abstract
A semiconductor memory device includes sense amplifier circuits each having a latch circuit connected to a sense node and storing circuits for storing identification data indicating sense amplifier circuits instructed to perform program when program data is loaded into the sense amplifier circuits. Before program verify read operation, data in the sense amplifier circuits instructed to perform programming by the loaded data is reset to the loaded data on the basis of the identification data in the storing circuits. This suppresses any rise in the potential of the common source line of a plurality of memory cells when a program verify operation is performed or when a page divisional program operation is performed, or suppresses any difference between the common source line potential rises in a program verify read operation and a normal read operation, thereby preventing incomplete programming. This improves the reliability of the program verify read operation and the page divisional program operation.