G - Physics – 06 – F
Patent
G - Physics
06
F
344/28
G06F 17/50 (2006.01)
Patent
CA 1253604
METHOD FOR ROUTING Abstract of the Disclosure In a routing method for efficiently routing interconnections of a printed circuit board, an ordered list of interconnections to be made is first developed, each interconnection consisting of a source and a target. The interconnection medium is notionally divided into cells and, in a flooding routine for deriving the route between a particular source and target, cells at a progressively increasing distance from the source are considered. The progressive flooding is performed under a preset control by associating a respective cost with each of a number of possible flooding directions. At any time, flooding occurs from that cell to which the accummulated cost of flooding from the source is a minimum. Eventually a target cell is reached and by tracing backpointer directions associated with the intervening cells, the least cost route is derived as a series of contiguous line segments having position, length and orientation. The same sequence is performed for all interconnections and the line segments are subsequently implemented as circuit board conductors and vias.
513277
Nortel Networks Limited
Smart & Biggar
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