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- W2095777592 abstract "This thesis describes a new approach to the problem of Geometrical Design Rule Checking (DRC). Previous DRC implementations have dealt with fully instantiated geometrical artwork. As the complexity of VLSI increases, it becomes infeasible to analyze the vast amounts of information present in a fully instantiated design. TheDRC algorithm presented here introduces an approach that exploits the structuralhierarchy of a design in order to reduce the computational complexity of thegeometrical tests that need to be made. The technique described is also applicable toother types of design checking such as circuit extraction, functional verificationand electrical rule verification. A new DRC algorithm has been developed that, by making use of the structureinherent in a hierarchical design, eliminates many redundant design rule checks.In this approach there are two places where possible design rule violations mayoccur. The first is within a symbol definition. The second is the area where twosymbols interact. The algorithm checks a given definition only once, and then examines how interactions within each new environment where the definition is placed modify the original definition. A note is made after each interaction has been scrutinized, so that a duplicate situation will not be rechecked. An implementation of the hierarchical DRC algorithm has been written at Caltech.This implementation extracts a minimal number of pairwise geometricalcomparisons needed to check the entire design. The program accepts as in put adesign description in the Caltech Intermediate Form (CIF). The output of the program is currently a fully instantiated version of those portions of the geometrythat need to be checked in order to check the entire design. A means of expressing the designer's intent through the design description isrequired. Current DRC's deal with geometrical artwork exclusively. Most of thedifficult design rules are involved in the checking of devices. Rather thanrestricting the designer to the use of geometry, the idea of a primitive element isintroduced. A primitive element is defined to be anything that cannot be brokendown into sub-elements. A design defined using primitive elements conveys moreof the functional structure than a purely geometric definition." @default.
- W2095777592 created "2016-06-24" @default.
- W2095777592 creator A5061528186 @default.
- W2095777592 date "1981-01-01" @default.
- W2095777592 modified "2023-09-23" @default.
- W2095777592 title "A Hierarchical Design Rule Checker" @default.
- W2095777592 hasPublicationYear "1981" @default.
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