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:
Dec. 11, 2012
Filed:
Jan. 28, 2011
Hitoshi Shiga, Yokohama, JP;
Hitoshi Shiga, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In writing operation, charge pumps of a memory apply any of first to n-th voltages which are different from each other. An application-voltage selector selects voltages to be applied to WLs among the first to n-th voltages. A word-line number register stores the number of WLs to which each of the first to n-th voltages is to be applied for the first to n-th voltages. A storage stores a correspondence table that stores a relationship between the number of WLs for each of the first to n-th voltages and the number of charge pumps allocated to the first to n-th voltages. A generation-voltage selector allocates charge pumps to generate the first to n-th voltages based on the correspondence table according to the number of WLs for each of the first to n-th voltages. Each charge pump generates any of the first to n-th voltages allocated by the generation-voltage selector.