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

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

This e-book describes a method of VLSI structure instruments referred to as IDA which stands for "Integrated layout Aides. " it isn't a main-line creation CAD atmosphere, yet nor is it a paper device. fairly, IDA is an experimental surroundings that serves to check out CAD principles within the crucible of genuine chip layout. Many good points were attempted in IDA through the years, a few effectively, a few no longer. This publication will emphasize the previous, and try and describe the gains which have been necessary and potent in development actual chips. sooner than discussing the current nation of IDA, it can be priceless to appreciate how the venture bought 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 give his perspectives on MOS chip layout, entire with the now recognized "lambda" layout principles and "tall, skinny designers. " To help this direction, 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 structure instruments constructed quickly round this compiler, together with layout rule checkers, editors and simulators.

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8 Quick Access to Large Designs In most chip designs, the lower level cells are created graphically and/or a compacter. In either case, the positions and electrical nets associated with their ports are fixed when the symbol is written. The IDA system can take advantage of this property to speed up access with a "pseudo-database" that provides quick, random access to the individual cells. Symbols with fixed ports normally reside in 34 Algorithms and Techniques for VLSI Synthesis their own files.

This could be done textually in the IMAGES language by specifying PORT statements that were symbolically bound to the lower level cells' ports. To do it graphically without specific support would be very tedious: One would have to add a port on top of the input and output instance ports of each cell. But this can be accomplished using the following sequence: ** In order to support this, the "undo" command also puts the mark back at its original location. 50 Algorithms and Techniques for VLSI Synthesis identify all filter out all but poly instance ports run the "fillports" command, which for each instance port in the chosen group, creates a new port in the higher level symbol, with the same name if possible, coincident, and with the same level extract electrical nets The result will be 32 new polysilicon ports on top of the corresponding ports in the lower-level symbols.

Figure 2-8: Example of the Need for Backward Edges We now iteratively solve G for and Ghat. When solving Gfop using Algorithm 2-4, we maintain the invariant that no edge gets moved farther than necessary in the positive direction. When solving Ghat> using a modified version of Algorithm 2-4, we maintain the invariant that no edge gets moved farther than necessary in the 28 Algorithms and Techniques for VLSI Synthesis negative direction. The entire algorithm is given in Algorithm 2-6b. Using Algorithm 2-6b we ensure that the placement requires as little area as possible and that the constraint resolution is performed in an efficient way.

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