Conference Paper

ETAM++: Extended Transition Activity Measure for Low Power Address Bus Designs.

DOI: 10.1109/ASPDAC.2002.994895 Conference: Proceedings of the ASPDAC 2002 / VLSI Design 2002, CD-ROM, 7-11 January 2002, Bangalore, India
Source: DBLP

ABSTRACT Interconnection networks in Systems-On-Chip begin to have a non-negligible impact on the power consumption of a whole system. This is because of increasing inter-wire capacitances that are in the same order of magnitude as intrinsic capacitances as far as deep-submicron designs are concerned. This trend has been recognized in recent research work. In this work, we present a physical model that takes into account inter-wire capacitances. Subsequently we propose a novel encoding scheme based on this physical model and targeted for address buses. We demonstrate that our encoding method improves power consumption by up to 62.5% and thus is exceeding all current approaches including our own previous one. In addition, the hardware of the bus encoding/decoding interfaces is compact to implement. We have conducted extensive simulations using SOC applications like, for example, an MPEGII encoder to evaluate the advantages of our approach.

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    ABSTRACT: Energy-efficient and reliable channels are provided for on-chip interconnection networks (OCINs) using a self-calibrated voltage scaling technique with self-corrected green (SCG) coding scheme. This self-calibrated low-power coding and voltage scaling technique increases reliability and reduces energy consumption simultaneously. The SCG coding is a joint bus and error correction coding scheme that provides a reliable mechanism for channels. In addition, it achieves a significant reduction in energy consumption via a joint triplication bus power model for crosstalk avoidance. Based on SCG coding scheme, the proposed self-calibrated voltage scaling technique adjusts voltage swing for energy reduction. Furthermore, this technique tolerates timing variations. Based on UMC 65 nm CMOS technology, the proposed channels reduces energy consumption by nearly 28.3% compared with that for uncoded channels at the lowest voltage. This approach makes the channels of OCINs tolerant of transient malfunctions and realizes energy efficiency.
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    ABSTRACT: Theoretical analysis of bus-invert coding for reducing switching activity was previously investigated. In this paper we conduct a theoretical analysis of this method for coupling reduction. Closed-form formulas are derived to compute the number of couplings per bus transfer for a non-partitioned versus a partitioned bus. Our contribution complements the work done previously and helps establish a sound theoretical foundation for bus-invert coding.
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