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Thiele, W. John and T. Lengauer, "Robust methods for EMC-driven routing", IEEE Transactions on Computer-Aided Design of ICs and Systems, Vol. 13, No. 11, 1994, pp. 1366-1378. L. -H. I. Long, "Simplified calculation of wave coupling between lines in high-speed integrated circuits", IEEE Transactions on Circuits and Systems, Vol. 37, No. 10, 1990, pp. 1201-1208. IV. Discussion and conclusions The analysis results of Section II enable quick computation of bounds for coupled noise which are intuitive and enable better design.

The first part is f(r) = U, the middle part is a decreasing function, and the last part is f(r) = L. The three parts of f(x) partition W into three wire segments, A, B, and C, where A has width U, C has width L, and B is defined by the middle part of f(r). It is easy to see that the middle part of f(x) must be of the form f(x) = ae-ba for some a > 0 and b > 0. To see this, we can consider the wire segment A to be a part of the driver and its resistance to be a part of Rd. Similarly, the wire segment C can be considered as a part of the load and its capacitance as a part of CL.

In this case, the expression shows that it is use- 29 ful to route nets of equal drive strengths adjacent to each other. In this way the ratio RI/R 2 is not too large when either net is considered as the victim net. Thus the optimal track assignment of a set of equal length nets entering and leaving a channel (with no other connection to be made) is obtained by sorting in order of drive strength. * Coupled noise is less of a problem for strongly driven nets. These nets have small R2, so that the peak coupled noise voltage is smaller and the noise integral is proportionately smaller.

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