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:
Apr. 21, 2020
Filed:
Nov. 05, 2018
Winbond Electronics Corp., Taichung, TW;
Kazuki Yamauchi, Kanagawa, JP;
Winbond Electronics Corp., Taichung, TW;
Abstract
A semiconductor memory device preventing inconsistent busy states between a plurality of memory chips is provided. A semiconductor memory device includes a master chip and at least one slave chip. The master chip and the slave chip include a status register capable of storing protection information. When a write-protect (WP) commend for locking the protection information of the status register is input, the protection information and lock information are programmed in a memory array. At this time, programming is controlled in a manner that a programming time in a selected memory chip is longer than a programming time in an unselected memory chip.