Abstract

Routing is a crucial problem in the VLSI layout design automation process. In this paper we study the channel routing problem for multiterminal nets in the knock-knee diagonal model (KKD), where the grid consits of right and left tracks displayed at +45° and −45°. We give three results in KKD by a unified and simple algorithm. Let d be the density of a given channel routing problem and w the width of channel. We have: (a) if all nets are two-terminal nets, then d + 1 is an upper bound to w (solved optimally); (b) if all nets are two- or three-terminal nets, then [ 3d 2 ] + 1 is an upper bound to w; (c) 2d is always an upper bound to w in KKD.

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