A bus permits the number of active serial data lanes of a data link to be re-negotiated in response to changes in bus bandwidth requirements. In one embodiment, one of the bus interfaces triggers a re-negotiation of link width and places a constraint on link width during the re-negotiation....http://www.google.de/patents/US7136953?utm_source=gb-gplus-sharePatent US7136953 - Apparatus, system, and method for bus link width optimization
