ACM-SIGDA Physical Design Workshop #5 1996: Proceedings by ACM-SIGDA

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Sangiovanni-Vincentelli, "Techniques for crosstalk avoidance in the design of high-performance digital systems", Digest of Technical Papers of the International Conference on Computer-Aided Design. 1994, pp. 616-619. [12] S. K. A. R. Carley, "Systemlevel routing of mixed-signal ASICs in WREN", Digest of Technical Papers of the International Conference on Computer-Aided Design, 1992, pp. 394-399. [13] A. Onozawa, K. S. Kuh, "Performance driven spacing algorithms using attractive and repulsive constraints for submicron LSIs", IEEE Transactions on CAD of ICs and Systems, Vol.

However, this is sub-optimal as finer grain permutations - track segment permutation rather than track permutation may lead to better results. Section III will show an example for which no track permutations are possible, while track segment permutations lead to optimal results. In [10], track segment permutations in a switchbox are considered. In Section III, we show that even this method is sub-optimal because the initial route is not driven by coupled noise considerations. Besides, drive strengths are not considered and Section II will show that the coupled noise model is simplistic.

Note that this NP-completeness result does not use vertical constraints as in [11] and is therefore a stronger result. Vertical constraints make channel routing NPcomplete and our result shows that crosstalk independently makes the problem intractable. 4 Greedy channel routing The pivotal idea of greedy channel routing is to route the channel using a column scan and completely routing a column before moving on to the next, introducing jogs when necessary. In order to consider coupled noise, the track assignment during the scan should attempt to satisfy crosstalk constraints on all nets.

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