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:
Mar. 17, 2009
Filed:
Dec. 13, 2006
Yasuyuki Fukuda, Kamakura, JP;
Noboru Shibata, Kawasaki, JP;
Yasuyuki Fukuda, Kamakura, JP;
Noboru Shibata, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A nonvolatile semiconductor memory device of the present invention is characterized in that, when data is written to a flag cell area, every other flag cell in the direction of one bit line BL among a plurality of flag cellsconnected to the bit line BL is written with data and every other flag cell in the direction of one word line WL among a plurality of flag cellsconnected to the word line WL is written with data. The arrangement as described above prevents a flag cellfrom being influenced by the capacitive coupling of a neighboring flag celladjacent to the flag cellin the direction of the word line WL. Thus, data (flag data) memorized by the flag cellcan have improved reliability.