HIGH DENSITY MODULE FOR SEMICONDUCTOR DEVICE CHIPS

摘要

The wiring nets on a module are divided into two groups of planes, i.e., an upper group in which wiring is placed along "north-south" and "east-west" directions and a lower group in which wiring is placed along diagonal directions. All vias for connecting to the wiring pass through the upper group of planes but only half of the vias pass through the lower group of planes. Thus the spacing between the vias of the lower group of planes is greater than the spacing between the upper vias, allowing more lines per wiring channel in the lower group of planes.