Patent ID: 8514625
Filing Date: 2013-08-20
Classification: G11C

Abstract:
1. A method of programming a nonvolatile memory device including strings extending from intersections of first through nth bit lines (n being an integer of 1 or more) and first through mth string selection lines (m being an integer of 4 or more), each string including memory cells formed in a direction perpendicular to a substrate to have multiple layers of cells, wherein the perpendicular direction is a Y-direction, the string lines extend in a Z-direction and the bit lines extend in an X-direction, comprising: programming memory cells at each layer of an YZ plane with multi-bit data according to a shadow programming method, wherein, where memory cells at an Nth layer (N being an integer of 1 or more) of the YZ plane are programmed, remaining memory cells at an XZ plane corresponding to the Nth layer are programmed before memory cells at another layer of the YZ plane are programmed, wherein the programming comprises: