c1_represent - Principles of VLSI Design Representations...

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Principles of VLSI Design Representations CMPE 413 1 UMBC U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 Circuit and System Representations IC design is hard because designers must juggle several different problems: • Multiple levels of abstraction: IC designs requires refining an idea through many levels of detail, speci- fication -> architecture -> logic design -> layout. • Multiple conflicting costs: Designs can be judged against different criteria. Most important criteria include speed, area and power. If both speed and area constraints are to be satisfied simultaneously, many design decisions will improve one at the expense of the other. Design is dominated by process of balancing conflicting constraints. • Short design times: Chips that appear too late may make little or no money because of com- petitors. Design time is especially tight for ASICs.
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Principles of VLSI Design Representations CMPE 413 2 UMBC U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 Circuit and System Representations Two techniques used by designers to eliminate unnecessary detail: Hierarchical design: Divide and conquer, complexity is reduced by recursively breaking it down into manageable parts. Each level of the hierarchy adds complexity by adding components. Commonly used in programming. Design abstraction: Complexity is reduced by successively replacing detail with simplifi ca- tions at higher levels of abstraction. Number of components do not change as it is recast to a lower level of abstraction.
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