By Lam, Tak-Kei
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Extra info for Boolean circuit rewiring : bridging logical and physical designs
1 What is Rewiring? Rewiring is a technique to replace certain existing wires in a circuit with some other additional wires without affecting the circuit function. 1(a). Suppose the wire a → e is the wire that we want to remove because of delay violations or any other reasons. We can transform the circuit in the following way such that the original function of the circuit remains unchanged. 1. 2. 3. 4. 1(b)). Disconnect the wire e → g and connect e to a1. Remove the wire a → e. Since the OR gate e has only one input now, it can also be removed.
It is improved in (Wei et al. 2013), in which the authors suggested the CECR rewiring technique. In CECR, the fault propagation algorithm is extended to find more alternative wires. It achieves this by introducing more mandatory assignments so that there are more potential sources and destinations for alternative wires. An effective cut enumeration algorithm is used in CECR to reduce the complexity significantly. The authors also suggested a windowing approach to make their rewiring technique scalable and practical for large circuits.
Becker, R. Hahn, U. Sparmann. Structure based methods for parallel pattern fault simulation in combinational circuits. In Proceedings of the European Conference on Design Automation. , pages 497–502. IEEE, 1991. -K. -C. Tang, X. -L. Wu. ECR: A powerful and low-complexity error cancellation rewiring scheme. ACM Transactions on Design Automation of Electronic Systems, 17(4):50:1–50:21, 2012. ISSN: 1084-4309. 2348854. -C. -Y. Wang. Rewiring using IRredundancy removal and addition. In Design, Automation Test in Europe Conference Exhibition, 2009.
Boolean circuit rewiring : bridging logical and physical designs by Lam, Tak-Kei