Algorithms and Techniques for VLSI Layout Synthesis by Dwight Hill, Don Shugard, John Fishburn, Kurt Keutzer

By Dwight Hill, Don Shugard, John Fishburn, Kurt Keutzer

This e-book describes a procedure of VLSI structure instruments known as IDA which stands for "Integrated layout Aides. " it isn't a main-line construction CAD surroundings, yet nor is it a paper instrument. quite, IDA is an experimental setting that serves to check out CAD rules within the crucible of actual chip layout. Many gains were attempted in IDA through the years, a few effectively, a few no longer. This booklet will emphasize the previous, and try to describe the good points which have been helpful and potent in construction genuine chips. sooner than discussing the current nation of IDA, it can be precious to appreciate how the venture obtained all started. even supposing Bell Labs has often had a wide and potent attempt in VLSI and CAD, researchers on the Murray Hill facility desired to examine the method of VLSI layout independently, emphasizing the assumption of small group chip construction. So, in 1979 they invited Carver Mead to offer his perspectives on MOS chip layout, whole with the now recognized "lambda" layout ideas and "tall, skinny designers. " To aid this path, Steve Johnson (better recognized for YACC and the transportable C compiler) and Sally Browning invented the constraint­ established "i" language and wrote a compiler for it. A small choice of format instruments constructed quickly round this compiler, together with layout rule checkers, editors and simulators.

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As before, the rationale for this requirement is simply that the extremum of the graph be fixed In later algorithms this requirement will be relaxed. ' exit end if solve Gp using Breadth-First Search (Algorithm 2-2a) for each edge

This allows icon to teU the user about the connectivity it understands. At the same time the user can specify that things that appear unrelated are electrically connected. The net information can also be used in editing. For example, the user can have all the features associated with a net highlighted on the screen and placed in the chosen group for further manipulation. " Most of the mechanisms involve the cursor. For example, where a transistor, wire and contact overlap, the user may want all three objects or just one.

Summary: Efficiency of Constraint Resolution The approach to geometric constraint resolution described in this section reflects a comprehensive survey of the relevant literature, as well as a mature perspective on the practical impact of various algorithmic alternatives. In our implementation of the IMAGES translator several attempts were made to simplify the final algorithm. For instance we tried eliminating the special handling of equality constraints that marks the transition from Algoritlun 2-4 to Algorithm 2-5c.

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