Browsing by Author "Potkonjak, Miodrag"
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Item Input vector control for post-silicon leakage current minimization under manufacturing variations(2008-02-04) Alkabani, Yousra; Koushanfar, Farinaz; Massey, Tammara; Potkonjak, MiodragWe present the first approach for post-silicon leakage power reduction through input vector control (IVC) that takes into account the impact of the manufacturing variability (MV). Because of the MV, the integrated circuits (ICs) implementing one design require different input vectors to achieve their lowest leakage states. There are two major challenges that have to be addressed. The first is the extraction of the gate-level characteristics of an IC by measuring only the overall leakage power for different inputs. The second problem is the rapid generation of input vectors that result in a low leakage for a large number of unique ICs that implement a given design, but are different in the post-manufacturing phase. We solve the first problem using a linear programming formulation that in a polynomial time, finds the most likely gate-level characterization of a pertinent IC. The approach is provably optimal, if there are no measurement errors; we also examine the erroneous cases. We address the second problem using the coordinated application of statistical clustering and the very large neighborhood iterative improvement algorithm. Experimental results on a large set of benchmark instances demonstrate the efficiency of the proposed methods. For example, the leakage power consumption could be reduced in average by more than 10.4%, when compared to the previously published IVC techniques that did not consider MV.Item Methods and systems of digital rights management for integrated circuits(2015-02-24) Koushanfar, Farinaz; Potkonjak, Miodrag; Rice University; Regents of the University of California; United States Patent and Trademark OfficeMethods for remote activation and permanent or temporary deactivation of integrated circuits (IC) for digital rights management are disclosed. Remote activation enables designers to remotely control each IC manufactured by an independent silicon foundry. Certain embodiments of the invention exploit inherent unclonable variability in modern manufacturing for the creation of unique identification (ID) and then integrate the IDs into the circuit functionality. Some of the objectives may be realized by replicating a subset of states of one or more finite state machines and by superimposing additional state transitions that are known only to the designer. On each chip, the added transitions signals are a function of the unique IDs and are thus unclonable. The method and system of the invention is robust against operational and environment conditions, unclonable and attack-resilient, while having a low overhead and a unique key for each IC with very high probability.