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. 13, 2001
Filed:
Feb. 03, 2000
Kazuhiko Kakizoe, Fuchu, JP;
Toru Okawa, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
Data of a memory cell in a cell array is read out by a readout circuit by use of a word line potential which is the same as that at the program verify time. After the end of the readout operation, data of the same memory cell is read out by the readout circuit by use of a word line potential (refresh verify potential) which is lower than the word line potential at the program verify time and higher than the word line potential at the read time. Then, data read out by use of the word line potential which is the same as that at the program verify time is compared with data read out by use of the word line potential which is set at the refresh verify potential and whether or not the additional write operation for holding data is effected for the memory cell is determined according to the result of comparison.