Abstract
This chapter discusses modern chip design methodologies. The graphics-display facility is one of the most attractive features of modern design systems. It renders immediate visibility of interim results of a design process in a way that allows the designer to interact with the system in a user-friendly and effective way. At the heart of an interactive graphics system is the visual display unit, which mostly takes the form of the familiar cathode-ray tube with a screen to display all the graphical information needed for monitoring the design. This visual information may contain a clarifying text, circuit schematics, timing characteristics, a mask artwork, or any other graphic information, which may be useful as the design evolves. Several graphics input devices are also available at present to allow the user to specify input information to the design system. One classic device is the alphanumeric keyboard that permits the user to enter the specification of a design description as well as a set of commands.
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