Multilevel and beveled-corner design-rule halos for computer aid

Details Multilevel and beveled-corner design-rule halos for computer aid Multilevel and beveled-corner design-rule halos for computer aid

1997-10-31

2000-04-04

Lintz, Paul R.

Computer-aided design and analysis of circuits and semiconductor

Nanotechnology related integrated circuit design

716 2, 716 8, 716 21, 717 1, 430 5, 345438, 364512, G06F 1750

Patent

active

060455845

ABSTRACT:
Enhanced capability design-rule halos for use in Computer Aided Design (CAD) software programs are described. Such enhanced halos, created around a design feature at the design rule distance from that feature, have the following characteristics: beveled corners for closer placement of adjacent non-parallel and/or non-perpendicular design features, level-to-level design rule halos, following a bend or turn in a design feature, the design rule halo automatically adapts to bends or turns in the design feature and associated changes in the design feature following the bend, following a bend or turn in a design feature, the design feature and the design rule halo automatically snap back, as required, to avoid a design rule violation with respect to an adjacent design feature, and the design-rule halo is prevented from extending closer to an adjacent design feature than the design rule distance. These actions are performed real-time and interactively.

REFERENCES:
patent: 5795682 (1998-08-01), Garza
Hedenstierna et al "The Halo Algorithm--An Alogorithm for Hierarchical Design of Rule Checking of VLSI Circuits," IEEE, pp. 265-272, Feb. 1992.
Hedenstierna et al "A Parallel Hierarchical Design Rule Checker," IEEE, pp. 142-146, 1992.
Onozawa et al "Performance Driven Spacing Algorithms Using Attractive and Repulsive Constraints for Submicron LSI's," IEEE, pp. 707-719, Jun. 1995.
Mentor Graphics Technology Files Manual, Software Version 5.2.sub.-- 1;Dec. 1991; pp. 2-29, 2-30 (Part No. 041869).

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