A patellar alignment device for determining the position of a patella prosthesis. A gate wire including a gate line, a gate pad and a gate electrode is formed on the substrate by using the first mask. Depending upon the packet, it is routed through nodes in the multiprocessor computer architecture in either an XY or YX path. Also, in comparison with a case in which the electrode is tapped on two or more sides, the present design makes it possible to secure the same effective visibility with a lightweight design. At least one non-volatile memory cell is formed along the length of the channel between the select gate and the second end of the channel.