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Flipping modules to improve circuit performance and routability

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2 Author(s)
Ahn, K. ; Dept. of Comput. Sci., Minnesota Univ., Minneapolis, MN, USA ; Sahni, S.

Preplaced modules may be flipped to improve performance and/or routability. We show that several versions of the module flipping problem are NP-hard. We propose algorithms to obtain module orientations that minimize the total wire length for module matrix and standard cell models. Additionally, we propose a heuristic to flip modules so as to minimize the length of the longest signal path. The results of experiments performed with this heuristic are also presented

Published in:

VLSI Design, 1994., Proceedings of the Seventh International Conference on

Date of Conference:

5-8 Jan 1994