17th INTERNATIONAL FORUM ON MPSoC
for software-defined hardware
For further information, please send email to Frédéric Pétrot
Kyoto University, Japan
Minimum Energy Point Tracking for Self-Powered IoT Processors
Scaling the supply voltage (VDD) and threshold voltage (Vth) simultaneously for minimizing the energy consumption of processors dynamically is highly desired for applications such as wireless sensor network and Internet of Things (IoT). In this paper, we refer to the pair of VDD and VTH, which minimizes the energy consumption of the processor under a given operating condition, as a minimum energy point (MEP in short). Since the MEP is heavily dependent on operating conditions such as workloads, temperature and process variations, it is not very easy to closely track the MEP at runtime. This paper proposes a simple yet effective algorithm for dynamically tracking the MEP of a processor under a wide range of operating conditions. The post-layout simulation results obtained for a 32-bit RISC processor designed with a 65 nm technology demonstrate that the algorithm proposed closely tracks the MEP under a situation that operating conditions widely vary.
Tohru Ishihara received his Dr.Eng. degree in computer science from Kyushu University in 2000. For the next three years, he was a Research Associate in the VLSI Design and Education Center, the University of Tokyo. From 2003 to 2005, he was with Fujitsu Laboratories of America as a Research Staff of an Advanced CAD Technology Group. From 2005 to 2011, he was with Kyushu University as an Associate Professor. In April 2011 he joined Kyoto University, where he is currently with the Dept. of Communications and Computer Engineering. His research interests include low-power design methodologies and power management techniques for embedded systems. Dr. Ishihara is a member of the IEEE, ACM, IPSJ and IEICE. He has served on program committee of numerous conferences such as CODES+ISSS, ISLPED and so on.