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:
May. 07, 2024
Filed:
Feb. 19, 2021
Winbond Electronics Corp., Taichung, TW;
Riichiro Shirota, Kanagawa, JP;
Masaru Yano, Kanagawa, JP;
Winbond Electronics Corp., Taiching, TW;
Abstract
A semiconductor memory device capable of reducing failure caused by a source side effect after a large number of W/E cycles is provided. A reading method of a NAND flash memory includes: dividing multiple word lines connected to each memory cell of a NAND string into a groupof word lines WLto WLi−1, a groupof word lines WLi to WLj, . . . , a group y of word lines WLj+1 to WLk−1, and a group x of word lines WLk to WLn, presetting a relationship that each readout voltage (Vread, Vread, . . . , Vready, and Vreadx) corresponding to each group increases toward a bit line side, and applying a readout voltage to a selected word line according to the relationship.