Sarma B. K. Vrudhula

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Portable embedded computing systems require energy autonomy. This is achieved by batteries serving as a dedicated energy source. The requirement of portability places severe restrictions on size and weight, which in turn limits the amount of energy that is continuously available to maintain system operability. For these reasons, efficient energy utilization(More)
Once the battery becomes fully discharged, a battery-powered portable electronic system goes off-line. Therefore, it is important to take the battery behavior into account. A system designer needs an adequate high-level model in order to make battery-aware decisions that target maximization of the system's lifetime on-line. We propose such a model: it(More)
—This paper presents a theory for (disjunc-tive and nondisjunctive) function decomposition using the BDD representation of Boolean functions. Incompletely specified as well as multi-output Boolean functions are addressed as part of the general theory. A novel algorithm (based on an EVBDD representation) for generating the set of all bound variables that(More)
Batteries are non-ideal energy sources - minimizing the energy consumption of a battery-powered system is not equivalent to maximizing its battery life. We propose an alternative interpretation of a previously proposed battery model, which indicates that the deviation from ideal behavior is due to the buildup of "unavailable charge" during the discharge(More)
We analyze the effect of thermal constraints on the performance and power of multi-core processors. We propose system-level power and thermal models, and derive expressions for (a) the maximum number of cores that can be activated, with and without throttling, (b) the speedup (multi-core over single core), and the total power consumption, both as functions(More)
Coarse-Grained Reconfigurable Architectures (CGRAs) are an attractive platform that promise simultaneous high-performance and high power-efficiency. One of the primary challenges in using CGRAs is to develop efficient compilers that can automatically and efficiently map applications to the CGRA. To this end, this paper makes several contributions: i)(More)