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Method and apparatus for proportionate costing of vias

  • US 6,944,841 B1
  • Filed: 10/31/2002
  • Issued: 09/13/2005
  • Est. Priority Date: 01/22/2002
  • Status: Expired due to Fees
First Claim
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1. A method of routing nets in an integrated-circuit layout region, the region having a plurality of interconnect layers, the method comprising:

  • (a) specifying a plurality of routes, wherein some of the routes utilize vias to traverse multiple interconnect layers; and

    (b) assessing a via cost of at least one via proportionately to a cost that the via introduces in the design of the integrated circuit, wherein a via introduces a cost in the design that is greater than the cost of a particular route length by a particular multiplier, and (c) specifying the via cost according to the particular multiplier.

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