This text focuses on presenting the basic features of the VHDL language in the context of its use for simulation. The text is targeted for use in sophomore and junior level courses in digital logic and computer architecture. The style of this text is intended to permit integration of the basic concepts underlying VHDL into existing courses without necessitating additional credit hours or courses for instruction. In order to fill the need for a companion text for digital logic and computer architecture courses and to serve as an early introduction to the basic language concepts the book must satisfy several criteria. First, it must relate VHDL concepts to those already familiar to the student. Students learn best when they can relate new concepts to ones with which they are already familiar. In this case we rely on concepts from the operation of digital circuits. Language features are motivated by the need to describe specific aspects of the operation of digital circuits, for example, events, propagation delays, and concurrency.
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