An efficient multi-level multi-wire differential interface

The authors introduce a multilevel, multiwire interface that, while retaining the differential properties of the signal, can transmit information at higher rates than would be possible through a binary differential interface with the same number of wires. Besides being rather insensitive to external electromagnetic noise sources, such an interface generates very little electromagnetic radiation. An efficient implementation of this interface, which adds very little complexity or die area over binary designs, has been designed and is currently being fabricated. Interfaces of this type can be used in designs which need a differential interface, but which would otherwise be limited by the number of pins on an IC package