Obstacle-Avoiding Rectilinear Steiner Minimal Tree Construction
AJWANI, GAURAV (2010) Obstacle-Avoiding Rectilinear Steiner Minimal Tree Construction. Masters thesis, Iowa State University.
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Obstacle-avoiding rectilinear Steiner minimal tree (OARSMT) construction is becoming one of the most sought after problems in modern design flow. In this thesis we present an algorithm to route a multi-terminal net in the presence of obstacles. Ours is a top down approach which includes partitioning the initial solution into subproblems and using obstacle aware version of Fast Lookup Table based Wirelength Estimation (OA-FLUTE) at a lower level to generate an OAST followed by recombining them with some backend refinement. To construct an initial connectivity graph we use a novel obstacle-avoiding spanning graph (OASG) algorithm which is a generalization of Zhou’s spanning graph algorithm without obstacle in ASPDAC 2001. The runtime complexity of our algorithm is O(n log n).
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