1,720,994 research outputs found
Extending Spectral Synthesis of Binary Streams to Sequential Circuits
No full textIn this paper, we introduce the extention of a stream synthesis method, initially born for combinational networks, to the case of sequential circuits. The peculiar feature of the method is the use of spectral analysis techniques based on the DFT to determine a reduced sequence of vectors that enables one to shorten power simulation time at a very limited accuracy penalty. Effectiveness and robustness of the proposed synthesis procedure are demonstrated by the results we have obtained on standard sequential benchmarks for a variety of input streams characterized by different statistics and correlation
Battery-Driven Dynamic Power Management of Portable Systems
No full textBattery life-time extension is a primary design objective for portable systems. Traditionally, battery life-time has been prolonged mainly by reducing average power consumption of system components. A careful analysis of discharge characteristics and the adoption of accurate high-level battery models in system-level design open new opportunities for life-time extension. In this paper, we introduce dynamic power management (DPM) policies specifically tailored to battery-powered systems. Battery-driven DPM strives to enhance life-time by automatically adapting discharge rate and current profiles to battery state-of-charge. The distinctive feature of these policies is the control of system operation based on the observation of battery output voltage. The effectiveness of the proposed policies and, more in general, of the idea of accounting for battery behavior during system design, is proved by the experiments carried out on a realistic case study, namely, an MP3 audio player
Scheduling Battery Usage in Mobile Systems
No full textThe use of multibattery power supplies is becoming common practice in electronic appliances of the latest generations. Economical and manufacturing constraints are at the basis of this choice. Unfortunately, a partitioned battery subsystem is not able to deliver the same amount of charge as a monolithic battery with the same total capacity. In this paper, we define the concept of battery scheduling, we investigate several policies for solving the problem of optimal charge delivery, and we study the relationship of such policies with different configurations of the battery subsystem. Experimental results, obtained for different kinds of current workloads, demonstrate that the choice of the proper scheduling can make system lifetime as close as 1% of the theoretical upper bound, that is, a monolithic power supply of equal capacity
Stream Synthesis for Efficient Power Simulation Based on SpectralTransforms
No full textOne way of minimizing the time required to perform simulation-based power estimation is that of reducing the length of the input trace to be fed to the simulator. Obviously, the use of a reduced stream may introduce some errors in the estimation results. The generation (or synthesis) of the short input sequence to be used for power simulation should then be carried out in such a way that the resulting error is minimized. Existing techniques exploit the knowledge of some statistical and correlation characteristics concerning the original input trace to generate a reduced stream that closely matches such characteristics. In this paper, we introduce a new stream synthesis method. Its distinguishing feature is the use of spectral analysis based on the discrete Fourier transform to determine a reduced sequence of vectors that enables us to shorten the overall power simulation time at a very limited penalty in accuracy. The effectiveness and the robustness, in terms of estimation accuracy, of the proposed synthesis procedure are demonstrated by the experimental results we have obtained on standard combinational benchmarks for a variety of input streams with different statistical and correlation properties. Data for sequential circuits are also reported
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