By Dwight Hill, Don Shugard, John Fishburn, Kurt Keutzer
This e-book describes a procedure of VLSI format 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. relatively, IDA is an experimental atmosphere that serves to check out CAD rules within the crucible of genuine chip layout. Many positive aspects 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 positive factors which have been important and powerful in development genuine chips. ahead of discussing the current kingdom of IDA, it can be necessary to appreciate how the venture acquired all started. even if Bell Labs has generally 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 belief 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 aid this path, Steve Johnson (better identified for YACC and the transportable C compiler) and Sally Browning invented the constraint established "i" language and wrote a compiler for it. A small selection of structure instruments constructed quickly round this compiler, together with layout rule checkers, editors and simulators.
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Additional info for Algorithms and Techniques for VLSI Layout Synthesis
The designer can say "copy," "move," "move. ") Icon supports many more complex commands that operate on the chosen. For example, the chosen group can be replicated in any direction. Icon will automatically figure out the spacing between copies so that the edges just touch each other. If the chosen contains a series of wires butted end to end, the "fuse" command joins them into one (whenever the wires have the same level, electrical net and width). This proved useful for simplifying an automatically generated layout that consisted of a regular array of cells filled with short segments of wires placed adjacent to one another.
Print the symbol instances with symbolic positions, keyed to the ports if possible, otherwise numerical positions. Print the marks with symbolic positions, keyed to the above objects if possible, otherwise numerically. Print the devices with symbolic positions, keyed to the above objects if possible, otherwise numerically. Print the contacts with symbolic positions, keyed to the above objects if possible, otherwise numerically. Print the wires with symbolic positions for each endpoint, keyed to the above objects if possible, otherwise numerically.
Short, relatively innocuous commands, such as 'j' to move the cursor down, are entered in the "raw" mode and cause action immediately. Longer commands, and ones with greater consequences, are initiated with a colon, after which the user can type the command using backspaces to correct mistakes. im" one would type :w! im Of course, the analogy with a text editor breaks down quickly, since text editors do not deal with transistors, electrical nets, etc. But wherever there is an overlap in function, the text editor command sequence was used.
Algorithms and Techniques for VLSI Layout Synthesis by Dwight Hill, Don Shugard, John Fishburn, Kurt Keutzer