Obstacle-avoiding rectilinear steiner tree construction based on spanning graphs
Journal
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Journal Volume
27
Journal Issue
4
Pages
643-653
Date Issued
2008
Author(s)
Abstract
Given a set of pins and a set of obstacles on a plane, an obstacle-avoiding rectilinear Steiner minimal tree (OARSMT) connects these pins, possibly through some additional points (called the Steiner points), and avoids running through any obstacle to construct a tree with a minimal total wirelength. The OARSMT problem becomes more important than ever for modern nanometer IC designs which need to consider numerous routing obstacles incurred from power networks, prerouted nets, IP blocks, feature patterns for manufacturability improvement, antenna jumpers for reliability enhancement, etc. Consequently, the OARSMT problem has received dramatically increasing attention recently. Nevertheless, considering obstacles significantly increases the problem complexity, and thus, most previous works suffer from either poor quality or expensive running time. Based on the obstacle-avoiding spanning graph, this paper presents an efficient algorithm with some theoretical optimality guarantees for the OARSMT construction. Unlike previous heuristics, our algorithm guarantees to find an optimal OARSMT for any two-pin net and many higher pin nets. Extensive experiments show that our algorithm results in significantly shorter wirelengths than all state-of-the-art works. © 2006 IEEE.
Subjects
Physical design; Routing; Spanning tree; Steiner tree
Other Subjects
Antennas; Collision avoidance; Computer aided manufacturing; Heuristic algorithms; Problem solving; Reliability theory; Physical design; Spanning tree; Steiner tree; Trees (mathematics)
Type
conference paper