Electrical transmission or interconnection systems – Conductor arrangements or structure
Patent
1995-05-24
1998-05-26
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Conductor arrangements or structure
364491, 364488, G06F 1500
Patent
active
057570892
ABSTRACT:
To prevent obstacles to wiring caused when wiring from other nets pass through the vicinity of a terminal, and moreover, to carry out automatic wiring having shorter wiring length and increased wiring completion rate, when calculating wiring costs of a wiring route of a net, for unwired terminals belonging to other nets, wiring route cost values for the net to be wired are variably assigned depending on distance from these terminals. In other words, in the present invention, cost values are established such that the cost weighting decreases with distance from unwired terminals of other nets. Seen from a different viewpoint, in the present invention, cost values are established such that cost increases for wiring routes passing within a prescribed range of an unwired terminal of another net. Incorporation of the above-described set cost value into the calculation of wiring costs enables automatic wiring that reduces cost, shortens wiring length, and prevents occurrence of unwired nets.
REFERENCES:
patent: 4823276 (1989-04-01), Hiwatashi
patent: 4910680 (1990-03-01), Hiwatashi
patent: 5361214 (1994-11-01), Aoki
A Detailed Router Based on Incremental Routing Modifications: Mighty by Hyunchul Shin, IEEE, and Alberto Sangiovanni -Vincentelli, Fellow IEEE, IEEE Transactions on Computer-aided Design, vol. CAD-6, No. 6, Nov. 1987.
Kaplan Jonathan S.
NEC Corporation
Shoop Jr. William M.
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