Patent ID: 9176873
Filing Date: 2015-11-03
Classification: G06F,G11C,H01L

Abstract:
1. A method of operating a semiconductor memory device including a plurality of cell string groups having pages stacked over a substrate, the plurality of cell string groups comprising first and second cell string groups, the first cell string group being commonly coupled to a first drain select line, the second cell string group being commonly coupled to a second drain select line, the method comprising: programming first pages in the first cell string group, the first pages being all of the pages in the first cell string group; and programming second pages in the second cell string group after the first pages are programmed, the second pages being all of the pages in the second cell string group and the second cell string group being adjacent to the first cell string group, wherein the programming of the first pages includes performing most significant bit programs to the first pages of the first cell string group after least significant bit programs to the first pages of the first cell string group are performed, wherein the programming of the second pages includes performing most significant bit programs to the second pages of the second cell string group after least significant bit programs to the second pages of the second cell string group are performed, wherein the most significant bit programs to the first pages of the first cell string group are performed after the least significant bit programs to the second pages, and wherein the most significant bit programs to the second pages of the second cell string group are performed after the most significant bit programs to the first pages.