Multi-layer over-the-cell routing with obstacles

Abstract

In this paper we present the first multi-layer graph-based router which can handle obstacles on any layer. We show that it improves the performance of a maze router with rip-up and reroute (RR) when obstacles are present. The graph-based router combined with a maze router with RR has yielded the best reported routing results for multi-layer problems with or without obstacles on any layer.