By Dwight Hill, Don Shugard, John Fishburn, Kurt Keutzer
This ebook describes a method of VLSI structure instruments known as IDA which stands for "Integrated layout Aides. " it's not a main-line creation CAD surroundings, yet nor is it a paper software. particularly, IDA is an experimental surroundings that serves to check out CAD principles within the crucible of actual chip layout. Many good points were attempted in IDA through the years, a few effectively, a few now not. This ebook will emphasize the previous, and try and describe the gains which have been beneficial and potent in construction genuine chips. prior to discussing the current nation of IDA, it can be priceless to appreciate how the undertaking obtained all started. even supposing Bell Labs has frequently had a wide and potent attempt in VLSI and CAD, researchers on the Murray Hill facility desired to research the method of VLSI layout independently, emphasizing the belief of small group chip construction. So, in 1979 they invited Carver Mead to provide his perspectives on MOS chip layout, whole with the now well-known "lambda" layout principles and "tall, skinny designers. " To help this path, Steve Johnson (better recognized for YACC and the moveable C compiler) and Sally Browning invented the constraint dependent "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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Extra resources for Algorithms and Techniques for VLSI Layout Synthesis
44 Algorithms and Techniques for VLSI Synthesis Figure 3-4b: Layout Pruned Down. Designer Interaction Figure 3-4c: Layout Ready for Replication. 45 46 Algorithms and Techniques for VLSI Synthesis ina inb z ,------,-------,------, z Figure 3-4d: Replicated Layout. Figure 3-4e: Flattened Layout. 47 Designer Interaction ina inb out Figure 3-4f: Touched up. out Figure 3-5: Schematic for XOR Gate. 48 Algorithms and Techniques for VLSI Synthesis Commands that Operate on the Chosen The editor provides many commands that act on all the chosen objects at once.
The IMAGES Language 19 A minimal area solution is arrived at because we increase the value of a coordinate only to the minimal amount required by the constraints. We give the algorithm in Algorithm 2-2a. Figure 2-5 shows a constraint graph as solved by Algorithm 2-2a. /* Given a directed acyclic graph G = (V,E) ** assign values to each VAL( v;) in V in such a way that each constraint ** Vj ~ Vj + cij reflected by
It also has to deal with nested loops and user errors. But it has the advantages that it works quickly in general use, has low overhead when looping features are not used and provides a high degree of flexibility. 33 The IMAGES Language Technology Independence/Technology Accessibility To make the language as technology independent as possible, IMAGES uses a technology file reader and technology database. The technology file influences the IMAGES translator in two ways: it detennines the set of technology words, such as METAL, that will be recognized and it provides some quantitative access to the underlying technology.
Algorithms and Techniques for VLSI Layout Synthesis by Dwight Hill, Don Shugard, John Fishburn, Kurt Keutzer