US Patent 7782671 Semiconductor device and method of manufacturing the same

A semiconductor device includes a plurality of a word lines. The word lines have a set of odd word lines and a set of even word lines. The odd and the even word lines are located from a first end region to a second end region through the cell region located between the first and the second end regions. The odd word lines are divided in the first end region and the even word lines are divided in the second end region to form dummy word line portions.