Patent ID: 7136953

Claim:
A method of bus power management, comprising: for a first operational state having a first link bandwidth requirement for a bus, negotiating a first link width between a first bus interface and a second bus interface disposed at opposite ends of said bus based on said first link bandwidth requirement, said first link width having a first integer number, M, of active data lanes that is less than or equal to a maximum integer number, K, of operable data lanes; and in response to detecting a second operational state having a second link bandwidth requirement, negotiating a second link width between said first bus interface and said second bus interface based on said second link bandwidth requirement said second link width having a second integer number, N, of active data lanes, where N is not equal to M, and N is also less than or equal to K; wherein the number of active data lanes that is negotiated is based on a bandwidth constraint to reduce the power consumption associated with active data lanes.