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

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

ISBN-10: 1461289629

ISBN-13: 9781461289623

ISBN-10: 146131707X

ISBN-13: 9781461317074

This publication describes a process of VLSI format instruments known as IDA which stands for "Integrated layout Aides. " it's not a main-line construction CAD setting, yet nor is it a paper instrument. particularly, IDA is an experimental surroundings that serves to check out CAD rules within the crucible of actual chip layout. Many positive aspects were attempted in IDA through the years, a few effectively, a few now not. This e-book will emphasize the previous, and try and describe the positive factors which have been necessary and powerful in development actual chips. earlier than discussing the current nation of IDA, it can be necessary to appreciate how the venture bought all started. even supposing Bell Labs has normally had a wide and powerful attempt in VLSI and CAD, researchers on the Murray Hill facility desired to learn the method of VLSI layout independently, emphasizing the belief of small staff chip development. So, in 1979 they invited Carver Mead to provide his perspectives on MOS chip layout, entire with the now well-known "lambda" layout principles and "tall, skinny designers. " To aid this direction, Steve Johnson (better identified 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 structure instruments built swiftly round this compiler, together with layout rule checkers, editors and simulators.

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G. insert, deletion, movement, etc). When an "undo" is requested, the hidden group is selectively added to, removed from or used to un-move the objects in the current symbol. The "deleted" group is preselVed in the face of simple commands such as cursor movement or panning the screen. However, if the user deletes something else, the "deleted" group is purged and refilled with the newly deleted objects. It is then impossible to undo the first deletion. TIlls structure seems to be satisfactory for most designers.

All of these tools are optimized for text files. The alternative, a binary database, was explored some years ago but it turned out to be unpopular. Several factors led to removing the binary form from the system. The most important was that it was largely redundant. When people design directly in a textual language the "official" design resides in text files and the binary format merely represents a copy of the design. Since the speed of parsing is such that most tools spend less than 10% of their time reading in a design, the extra step of converting to the binary form and additional storage required was never justified.

Liao and Wong [LiW083] propose partitioning the graph G into a graph Gp and G n where an edge E Ep if Cij >0 and is a member of En otherwise. The graph Gp can then be topologically ordered and then solved by the breadth-first search algorithm given above. The question then remains how is the influence of the non-positive edges felt in the solution. The approach used is to solve Gp ' add in the edges of Ell then solve Gp again. , when the value of no vertex in V changes. Algorithm 2-4 gives a more complete description of this procedure.

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

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