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. 10, 2020
Filed:
Mar. 01, 2018
Toshiba Memory Corporation, Tokyo, JP;
Kazutaka Takizawa, Yokohama Kanagawa, JP;
Masaaki Niijima, Machida Toyko, JP;
TOSHIBA MEMORY CORPORATION, Tokyo, JP;
Abstract
A semiconductor memory device includes a nonvolatile memory and a controller. The nonvolatile memory has a plurality of memory cells that are connected to word lines to which a read voltage is applied at the time of reading data stored in the memory cells. The controller is configured to determine a read voltage for a target memory cell by selecting a tracking parameter based on a word line connected to the target memory cell and an elapsed time from a previous access to a group of memory cells including the target memory cell, and executing a tracking process on the memory cells also connected to the word line connected to the target memory cell using the selected tracking parameter.