Patent ID: 9015407
Filing Date: 2015-04-21
Classification: G06F,G11C

Abstract:
1. A method of operating a three-dimensional nonvolatile NAND memory formed in a plurality of physical levels of memory cells disposed above a substrate in which a conductive body forms a word line in each of a plurality of separately selectable sets of vertical strings of a block, comprising: configuring at least one operating parameter for a first edge zone that includes one or more of the plurality of separately selectable sets of vertical strings of a block according to characterization of a first reference set of vertical strings that is in the first edge zone; configuring the at least one operating parameter for a second edge zone that includes one or more of the plurality of separately selectable sets of vertical strings of the block according to characterization of a second reference set of vertical strings that is in the second edge zone; and configuring the at least one operating parameter for a central zone that includes two or more of the plurality of separately selectable sets of vertical strings of the block located between the first edge zone and the second edge zone, according to characterization of a third reference set of vertical strings that is in the central zone.