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. 09, 2016
Filed:
Sep. 08, 2014
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Norihiro Fujita, Yokohama, JP;
Jun Segawa, Fujisawa, JP;
Kabushiki Kaishia Toshiba, Minato-ku, JP;
Abstract
According to one embodiment, in a nonvolatile memory, the determination unit determines whether a change process is executable or not. The change process is a process based on characteristics of the memory cell array when a first write process is performed. The change process changes at least one of a value of a write start voltage and an increase amount in a write voltage in a second write process. The second write process is a process where a write operation of writing data to upper pages of at least part of the plurality of nonvolatile memory cells and a verification operation are alternately repeated. The setting unit sets a maximum value for determining whether the second write process succeeds or fails to a first value when the change process is executable, and sets the maximum value to a second value when the change process is not executable.