Adaptive Partial Businvert Encoding for Power Efficient Data Transfer over Wide System Buses

In this paper we describe a new method for encoding data streams on system buses in order to reduce bus line transition activity. Our focus is on data streams whose statistical parameters such as transition activity are nonstationary or a priori unknown. Our method is based on the Partial Businvert Encoding method which is extended with a dynamic selection of the bus lines to be encoded. We present the theoretical basics and an efficient implementation of a corresponding coder-decoder system. Experimental results showed a reduction in transition activity of up to 42% compared to the uncoded data stream and a reduction in power dissipation of up to 52.5% compared to the best published encoding scheme working without a priori knowledge about the data stream characteristics.