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Spacing violation checker

  • US 6,301,689 B1
  • Filed: 09/28/1998
  • Issued: 10/09/2001
  • Est. Priority Date: 09/28/1998
  • Status: Expired due to Fees
First Claim
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1. A process of testing spacing of wiring in a circuit comprising:

  • forming a plurality of conductor rectangles representative of conductors of said circuit;

    forming minimum spacing rectangles around said conductor rectangles, said minimum spacing rectangles being larger than respective ones of said conductor rectangles;

    identifying a possible error rectangle when a first conductor rectangle of said conductor rectangles occupies a portion of a minimum spacing rectangle of a second conductor rectangle of said conductor rectangles;

    checking whether said possible error rectangle is a true error; and

    reporting said true errors;

    wherein said checking comprises;

    classifying said possible error rectangle as a possible diagonal error rectangle or a possible non-diagonal error rectangle;

    determining that said possible diagonal error rectangle is said not a true error when at least two adjacent sides of said possible diagonal error rectangle which intersect said first conductor and said second conductor are covered by a third conductor of said conductors; and

    determining that said possible non-diagonal error rectangle is not a true error when said possible non-diagonal error rectangle is completely covered by said third conductor.

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