A Bus Encoding Scheme to Reduce Power Consuming Signal Transitions

Abstract- As the technology scales down, the reduced spacing between the individual wires within a bus results in increased crosstalk. This increases power dissipation particularly in wide data buses. We propose an efficient encoding scheme that significantly reduces the number of correlated switching (coupling transitions) as well as self-transitions among the wires in the data busses. The proposed scheme reduces the number of correlated switching by 67 % compared to the Bus-Invert approach and by 50 % compared to the EXODUS method in four-bit bus lines. This scheme also reduces the number of self transitions by 12 % compared to EXODUS scheme and equals to those produced by Bus-Invert approach