Effect of relative delay on the dissipated energy in coupled interconnects

This paper presents a comprehensive qualitative and analytical analysis of the effect of relative delay on the dissipated energy due to relative switching of on-chip buses. A closed form expression modeling the effect of relative delay on the dissipated energy is also presented. Introducing a relative delay between signals on adjacent bus lines is found to only affect the switching cases in which the neighboring lines switch in the same or opposite direction. The delay is shown to provide a reduction up to 50% in the energy dissipation due to relative switching of the worst switching case. This observation can be implemented in low-power on-chip bus schemes.