Techniques for multilayer channel routing

The techniques described have been implemented in a multilayer channel router called Chameleon. Chameleon consists of two stages: a partitioner and a detailed router. The partitioner divides the problems into two-layer and three-layer subproblems such that global channel area is minimized. The detailed router then implements the connections using generalizations of the algorithms used in YACR2 (see ibid., vol.CAD-4, no.3, p.208-19, 1985). In particular, a three-dimensional maze router is used for the vertical connections; this methodology is effective even when cycle constraints are present. Chameleon has produced optimal results on a wide range of industrial and academic examples for a variety of layer and pitch combinations, and can handle a variety of technology constraints. >

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