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. 02, 2000
Filed:
Jul. 21, 1999
Applicant:
Inventors:
Keniti Imamiya, Kawasaki, JP;
Hiroshi Nakamura, Kawasaki, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
3651853 ; 36518517 ; 36518522 ; 36518524 ;
Abstract
If data is read from a selected memory cell at the time of overwrite verifying, a Potential of a bit line is changed in accordance with data. If a transistor is turned on, a latch circuit is set in accordance with data of the bit line. In a case where there is a memory cell being in an overwrite state, data of the selected memory cell is latched to the latch circuit, and data corresponding to one page is erased. Thereafter, a normally writing operation is executed by data latch to the latch circuit, thereby the memory cell being in the overwrite state can be used as a normal threshold voltage.