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Obstacle-Avoiding Rectilinear Steiner Minimum Tree: A Survey

Arpana Bhagwat

Rectilinear Steiner Minimum Tree (RSMT) is one of the global routing techniques in VLSI design, where the tree spans a given set of pins by reaching each of them either vertically or horizontally.While constructing such RSMTs, there can be many obstacles.There are many research works done in order to construct RSMTs which aredevoid of obstacles. Some of the recent research works are considered in this paper to understand the problem and to learn the available solutions.It covers and compares different approaches and methodologies which are used to find OARSMT. Some of the different approaches discussed here are Geo-Steiner approach, Maze routing method, Top-down partitioning approach and Greedy heuristic method.Comparison of these algorithms in accordance with their speed, efficiency, resources used and other pros and cons are also listed as a part of this work. A table listing the experimental results ismadeto realize the actual performance of different algorithms.