Forced conformance design-rule halos for computer aided design s

Details Forced conformance design-rule halos for computer aided design s Forced conformance design-rule halos for computer aided design s

1997-10-31

2000-06-20

Lintz, Paul R.

Computer-aided design and analysis of circuits and semiconductor

Nanotechnology related integrated circuit design

716 11, 716 8, 345438, G06F 1750, G06T 320

Patent

active

060773073

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
Mentor Graphics Technology Files Manual, Software Version 5.2.sub.- 1;Dec. 1991; pp. 2-29,2-30 (Part No. 041869).
Hedenstierna et al "The Halo Algorithm-An Algorithm for Hierarchical Design of Rule Checking of VLSI Circuits," IEEE, pp. 265-272, Feb. 1993.
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.

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