Adaptive bus encoding technique for switching activity reduced data transfer over wide system buses

Abstract

In this paper,w e describe a new encoding technique which reduces bus line transition activity for power-efficient data transfer over wide system buses. The focus is on data streams whose statistical parameters such as transition activity are either non-stationary or a priori unknown. The proposed encoding technique extends the Partial Businvert encoding method [1] with a dynamic selection of the bus lines to be encoded. In this work,w e present the encoding algorithm and a low power implementation of a corresponding coder-decoder system. Experiments with real-life data streams yielded a reduction in transition activity of up to 42% compared to the uncoded data stream.