Introduction
Layout check is critical for the success of type-out of integrated circuits. Calibre of mentor graphic is popular commercial tool to perform layout check. It explores the original design data of the IC layout and identifies spots of rule violation. Another possible way for the layout check is through the visual technology. Errors can be found by looking at the images of the chip layout. Visual inspection is friendly for human nature. It helps the proj ect manager to understand more precisely the work of the design engineers and even to point out the mistakes in the work.