TWIGY - a topological algorithm based routing system
DAC '81 Proceedings of the 18th Design Automation Conference
Implementation of an interactive printed circuit design system
DAC '78 Proceedings of the 15th Design Automation Conference
An implementation of a saturated zone multi-layer printed circuit board router
DAC '80 Proceedings of the 17th Design Automation Conference
A solution to line-routing problems on the continuous plane
DAC '69 Proceedings of the 6th annual Design Automation Conference
A rectangle-probe router for multilayer P.C. boards*
DAC '77 Proceedings of the 14th Design Automation Conference
DAC '82 Proceedings of the 19th Design Automation Conference
A “lookahead” router for multilayer printed wiring boards
DAC '79 Proceedings of the 16th Design Automation Conference
New models for four- and five-layer channel routing
DAC '92 Proceedings of the 29th ACM/IEEE Design Automation Conference
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The routing problem for Printed-Circuit Boards (PCB's) is crucial in the fabrication of today's digital systems. Traditionally, this problem has been divided into two main sub-problems: layer assignment and routing. Considering these two problems apart from each other may cause uneven wire distribution both among the wiring layers and within each layer. Uneven wire distribution among the wiring layers could increase the number of wiring surfaces required for the routing. Uneven wire distribution within a layer could result in an unfeasible routing. We propose a new approach to deal with the routing of PCB's in technologies which allow short vias. The proposed methodology considers the layer assignment and routing problems in a unified fashion. Based on some global information, our algorithm first estimates the initial number of layers required for the routing. It then determines an ordering in which nets should be considered during the layer assignment process. The results of our experiments show that our algorithm is of practical use.