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This book describes a system of VLSI layout tools called IDA which
stands for "Integrated Design Aides. " It is not a main-line
production CAD environment, but neither is it a paper tool. Rather,
IDA is an experimental environment that serves to test out CAD
ideas in the crucible of real chip design. Many features have been
tried in IDA over the years, some successfully, some not. This book
will emphasize the former, and attempt to describe the features
that have been useful and effective in building real chips. Before
discussing the present state of IDA, it may be helpful to
understand how the project got started. Although Bell Labs has
traditionally had a large and effective effort in VLSI and CAD,
researchers at the Murray Hill facility wanted to study the process
of VLSI design independently, emphasizing the idea of small team
chip building. So, in 1979 they invited Carver Mead to present his
views on MOS chip design, complete with the now famous "lambda"
design rules and "tall, thin designers. " To support this course,
Steve Johnson (better known for YACC and the portable C compiler)
and Sally Browning invented the constraint based "i" language and
wrote a compiler for it. A small collection of layout tools
developed rapidly around this compiler, including design rule
checkers, editors and simulators."
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