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A fast algorithm for routability testing

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2 Author(s)
Sarrafzadeh, M. ; Dept. of Electr. & Comput. Eng., Northwestern Univ., Evanston, IL, USA ; Takahashi, T.

An L-shaped routing of a two-terminal net is its upper- or lower routing Given a set of nets: the planar testability problem (PTP) Is to decide if there exists a planar (i.e., pairwise non-crossing) L-shaped routing of all nets. PTP was solved via transformation to 2-satisfiability. Here, we propose an efficient greedy algorithm running in O(n(logn)2, where n is the number of nets. The density-1 testability problem (D1TP) is to decide if there exists an L-shaped routing of all nets with density 1 (i.e., overlap routing is not allowed, however routed nets may intersect each other). We extend-the PTP algorithm to solve the D1TP problem in O(nlogn) time

Published in:

Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on  (Volume:6 )

Date of Conference:

Jul 1999