Boolean circuit rewiring : bridging logical and physical by Lam, Tak-Kei

By Lam, Tak-Kei

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Extra info for Boolean circuit rewiring : bridging logical and physical designs

Example text

The major practical rewiring techniques introduced thus far focus on using one alternative wire to replace one target wire. 12, the stuck-at fault sa0(b → g1) is propagated through gate g1, then gate g5, and subsequently through gates g7 and g8 simultaneously. The sets of gates {g1}, {g5}, and {g7, g8} are called errors frontiers (indicated as dashed snaky lines) with respect to the fault sa0(b → g1). Obviously, if the effect of the error can be cancelled at either {g1}, {g5}, or {g7, g8}, the fault is unobservable.

VLSI Design, 2000. Thirteenth International Conference on, pages 268–273, 2000a. 812620. -L. -N. -C. Cheung, and H. Fan. On improved graph-based alternative wiring scheme for multi-level logic optimization. Electronics, Circuits and Systems, 2000. ICECS 2000. The 7th IEEE International Conference on, vol. 2:654–657, 2000b. 912962. S. Yamashita, H. Sawada, and A. Nagoya. A new method to express functional permissibilities for LUT based FPGAS and its applications. In ICCAD ’96: Proceedings of the 1996 IEEE/ACM international conference Concept of Logic Rewiring 35 on Computer-aided design, pages 254–261, Washington, DC, USA, 1996.

Therefore, besides REWIRE, RAMFIRE is also substantially faster than RAMBO. It was experimentally proven that REWIRE can find more alternative wires than RAMFIRE. In other words, REWIRE has a higher rewiring ability. 1 Rewiring ability is defined as the ratio of the wires in a circuit that has alternative wires to the total number of wires. 2 Delete-First In the previous section, we briefly introduce the add-first rewiring techniques. Is it necessary that we have to add redundant wires to force some originally irredundant wires to be redundant?

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