Efficient obstacle-avoiding rectilinear steiner tree construction

Chung Wei Lin, Szu Yu Chen, Chi Feng Li, Yao Wen Chang, Chia Lin Yang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

37 Scopus citations


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 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 (OASG), 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 2-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.

Original languageEnglish
Title of host publicationProceedings of ISPD'07
Subtitle of host publication2007 International Symposium on Physical Design
Number of pages8
StatePublished - 2007
EventISPD'07: 2007 International Symposium on Physical Design - Austin, TX, United States
Duration: 18 Mar 200721 Mar 2007

Publication series

NameProceedings of the International Symposium on Physical Design


ConferenceISPD'07: 2007 International Symposium on Physical Design
Country/TerritoryUnited States
CityAustin, TX


  • Physical design
  • Routing
  • Spanning tree
  • Steiner tree


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