Reducing mutual inductance of wide signal busses through swizzling

On-chip inductive coupling has been shown to depend on the distance wires ran in parallel. It has also been shown to depend on the distance separating an attacker and the victim. This has major effect on global signal busses in high performance microprocessors as they are usually routed as a bundle containing a large number of signals traveling for long distances. A solution has been proposed through a process known as swizzling, where the order of signal wires in the bus is continuously rearranged to move attackers and victims away from each other. This technique has the advantage of reducing the mutual inductance between neighboring wires with zero area or routing resource cost. In this paper, we show a formulation of the swizzling technique and report on some simulation results to highlight the resulting improvements.