Patent ID: 8767460
Filing Date: 2014-07-01
Classification: G11C,H01L

Abstract:
1. A nonvolatile semiconductor memory device, comprising: a semiconductor substrate having a memory cell array and a control circuit; a plurality of element isolation insulating films formed in the semiconductor substrate in the memory cell array and having a first direction as a long direction; a plurality of element formation regions which are formed isolated by the element isolation insulating films and in each of which a memory string is formed; and a plurality of element formation region groups each configured by the element formation regions, the plurality of element formation region groups being arranged along a second direction orthogonal to the first direction; wherein in the memory cell array, in the second direction, a spacing between the element formation regions changes periodically, and a spacing between the element formation region groups is larger than a spacing between the element formation regions in each of the element formation region groups, and the control circuit executes a write operation on the memory cell array on an element formation region group basis.