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We will describe a CAD system used by AT & T Bell Laboratories, AT & T Information Systems, and AT & T Technologies, Inc. for the design and documentation of electronic packages. It is a highly integrated system designed around a single common data base. Both the system and data base have evolved over a number of years. The system is made up of(More)
Most people who are involved with routing printed wiring boards have one or more favorite indicators which they use to predict routing success. Generally these indicators are looked at more as an afterthought, however. If the numbers happen to be available, people might look at them, but seldom is there a deliberate attempt to find and analyze them. This(More)
The concept of an integrated data base has great appeal for design automation system developers (Fig. 1). A single repository for all data on a given design has many advantages, though it can be argued there are severe disadvantages also. It is not the purpose of this paper to discuss the pros and cons of integrated data bases, but to look at the process(More)