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Stretching a Knock-Knee Layout for Multilayer Wiring
January 1990 (vol. 39 no. 1)
pp. 148-151

The problem of stretching a knock-knee layout in the knock-knee mode to ensure its wirability is considered. An optimal algorithm for the problem in two layers is presented. A 4/3 approximation algorithm for the corresponding problem in three layers, shown to be NP-complete, is devised.

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Index Terms:
knock-knee layout stretching; VLSI; multilayer wiring; knock-knee mode; optimal algorithm; 4/3 approximation algorithm; NP-complete; circuit layout CAD; VLSI.
M.L. Brady, M. Sarrafzadeh, "Stretching a Knock-Knee Layout for Multilayer Wiring," IEEE Transactions on Computers, vol. 39, no. 1, pp. 148-151, Jan. 1990, doi:10.1109/12.46293
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