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25th IEEE International Real-Time Systems Symposium (2004)
Lisbon, Portugal
Dec. 5, 2004 to Dec. 8, 2004
ISSN: 1052-8725
ISBN: 0-7695-2247-5
pp: 104-113
Andy Lambrechts , IMEC vzw and Katholieke Universiteit Leuven
Tom Vander Aa , Katholieke Universiteit Leuven
Murali Jayapala , Katholieke Universiteit Leuven
Anthony Leroy , IMEC vzw and Université Libre de Bruxelles
Adelina Shickova , IMEC vzw and Katholieke Universiteit Leuven
Francisco Barat , Katholieke Universiteit Leuven
Bingfeng Mei , IMEC vzw and Katholieke Universiteit Leuven
Francky Catthoor , IMEC vzw and Katholieke Universiteit Leuven
Diederik Verkest , IMEC vzw, Katholieke Universiteit Leuven and Vrije Universiteit Brussel
Geert Deconinck , Katholieke Universiteit Leuven
Henk Corporaal , TU/e Eindhoven
Frédéric Robert , Université Libre de Bruxelles
Users expect future handheld devices to provide extended multimedia functionality and have long battery life. This type of application imposes heavy constraints on both (real-time) performance and energy consumption and forces designers to optimise all parts of their platform. In this experiment we focus on the different processor core design options for future embedded platforms, including the effect of instruction memory hierarchy on the energy consumption. The results show that significant improvements for energy efficiency and/or performance over currently used RISC or VLIW processors can be achieved. We conclude, based on concrete data for a realistic application, that different styles, including both configurable hardware and instruction set processors, will find their way into future heterogeneous platforms and designers will need to be aware of the trade-offs. Secondly, we show for the same application task that a heavily optimised instruction/configuration memory hierarchy can significantly reduce the energy consumption of this part, so it forms a crucial part of every energy aware design.

A. Lambrechts et al., "Design Style Case Study for Embedded Multi Media Compute Nodes," 25th IEEE International Real-Time Systems Symposium(RTSS), Lisbon, Portugal, 2004, pp. 104-113.
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