Item Details

Routing a Multi-Terminal Critical Net: Steiner Tree Construction in the Presence

Lavinus, J; Cohoon, J
Format
Report
Author
Lavinus, J
Cohoon, J
Abstract
This paper presents a new model for VLSI routing in the presence of obstacles, that transforms any routing instance from a geometric problem into a graph problem. It is the first model that allows computation of optimal obstacle-avoiding rectilinear Steiner trees in time corresponding to the instance size (the number of terminals and obstacle border segments) rather than the size of the routing area. For the most common multi-terminal critical nets-those with three or four terminals-we observe that optimal trees can be computed as efficiently as good heuristic trees, and present algorithms that do so. For nets with five or more terminals, we present algorithms that heuristically compute obstacle-avoiding Steiner trees. Analysis and experiments demonstrate that the model and algorithms work well in both theory and practice. Note: Abstract extracted from PDF text
Language
English
Date Received
20121029
Published
University of Virginia, Department of Computer Science, 1993
Published Date
1993
Collection
Libra Open Repository
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