An analytic model of printed circuit wiring distributions

A description is given of a mathematical model of wire segment distribution on printed wiring boards. In this model segment, distributions are broken down into two components: net distributions and segment ratios. The net distribution is closely related to the CAD component placement process, whereas the segment ratio is closely related to the CAD net segmentation process. In most cases net distribution is by far the largest part of wiring. Peak segment congestion estimates and segment length estimates are obtained. Both of these estimates are expressed in terms of readily determined circuit properties. The model predicts segment congestion and length reliably