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NP-Hard Module Rotation Problems
December 1993 (vol. 42 no. 12)
pp. 1506-1510

Preplaced circuit modules may be rotated to improve performance and/or routability. It is shown that several simple versions of the module rotation problem are NP-hard.

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Index Terms:
circuit layout CAD; computational complexity; NP-hard module rotation problems; circuit modules; performance; routability; circuit layout CAD.
K. Ahn, S. Sahni, "NP-Hard Module Rotation Problems," IEEE Transactions on Computers, vol. 42, no. 12, pp. 1506-1510, Dec. 1993, doi:10.1109/12.260642
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