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 process of VLSI structure instruments known as IDA which stands for "Integrated layout Aides. " it isn't a main-line construction CAD setting, 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 no longer. This publication will emphasize the previous, and try to describe the good points which were invaluable and powerful in development genuine chips. sooner than discussing the current nation of IDA, it can be priceless to appreciate how the undertaking received begun. even if Bell Labs has typically 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 offer his perspectives on MOS chip layout, entire with the now recognized "lambda" layout ideas and "tall, skinny designers. " To aid this direction, Steve Johnson (better identified for YACC and the transportable C compiler) and Sally Browning invented the constraint­ dependent "i" language and wrote a compiler for it. A small number of format instruments constructed swiftly round this compiler, together with layout rule checkers, editors and simulators.

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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. It allows them to undo most critical operations quickly and avoids unnecessary overhead. ) Furthermore, the editor understands that many commands (such as replotting commands or commands to change settings) do not influence the chosen group. They cannot be undone, but neither do they lose the context of the chosen group.

When the editor is invoked, it puts the cursor and mark in the lower left and upper right quadrants (Figure 3-1). ark Figure 3-1: Initial Icon Screen Display. Commands can be entered in three modes, via the keyboard (with mouse for positioning), via a pop-up mouse menu (with some keyboard entry) or from a batch file of keyboard command characters. The first is by far the most popular, the second has some advantages for inexperienced users. The batch file mode is mostly used with prepared scripts to perform modifications on a chip or to test and demonstrate the editor.

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 in E ** is satisfied. ** If it is not possible to satisfy constraints report so. **/ breadth_ firstO Find the sources S of the directed acyclic graph G if none exist report "ERROR CYCLE IN GRAPH" for each s in S forwardyropagate(s) end for for each s in S VAL(s) = 0 end for end breadth first Algorithm 2-2a: Breadth-First Search.

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