Efficient Rectilinear Steiner Tree Construction with Rectilinear Blockages
ICCD '05 Proceedings of the 2005 International Conference on Computer Design
An O(nlogn) algorithm for obstacle-avoiding routing tree construction in the λ-geometry plane
Proceedings of the 2006 international symposium on Physical design
Circuit simulation based obstacle-aware Steiner routing
Proceedings of the 43rd annual Design Automation Conference
Efficient obstacle-avoiding rectilinear steiner tree construction
Proceedings of the 2007 international symposium on Physical design
A Fast and Stable Algorithm for Obstacle-Avoiding Rectilinear Steiner Minimal Tree Construction
ASP-DAC '07 Proceedings of the 2007 Asia and South Pacific Design Automation Conference
Preferred direction Steiner trees
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Efficient multilayer routing based on obstacle-avoiding preferred direction steiner tree
Proceedings of the 2008 international symposium on Physical design
High-performance obstacle-avoiding rectilinear steiner tree construction
ACM Transactions on Design Automation of Electronic Systems (TODAES)
Obstacle-avoiding rectilinear Steiner tree construction based on Steiner point selection
Proceedings of the 2009 International Conference on Computer-Aided Design
Efficient multi-layer obstacle-avoiding preferred direction rectilinear Steiner tree construction
Proceedings of the 16th Asia and South Pacific Design Automation Conference
An exact algorithm for the construction of rectilinear Steiner minimum trees among complex obstacles
Proceedings of the 48th Design Automation Conference
Obstacle-avoiding rectilinear Steiner minimum tree construction: an optimal approach
Proceedings of the International Conference on Computer-Aided Design
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Given a set of pins and a set of obstacles on routing layers, a multi-layer obstacle-avoiding rectilinear Steiner minimal tree (ML-OARSMT) connects these pins by rectilinear edges within layers and vias between layers, and avoids running through any obstacle to construct a Steiner tree with a minimal total cost. The ML-OARSMT problem is very important for many VLSI designs with pins being located in multiple routing layers that contain numerous routing obstacles incurred from IP blocks, power networks, prerouted nets, etc. Therefore, it is desired to develop an effective algorithm for the ML-OARSMT problem. However, there is no existing work on the MLOARSMT problem. In this paper, we first formulate the MLOARSMT problem and identify key different properties of the problem from its single-layer counterpart. Based on the multi-layer obstacle-avoiding spanning graph (ML-OASG), we present the first algorithm to solve the ML-OARSMT problem. Our algorithm can guarantee an optimal solution for any 2-pin net and many higher-pin nets. Experiments show that our algorithm results in 33% smaller total costs on average than a construction-by-correction heuristic which is widely used for Steiner-tree construction in the recent literature.