Patent ID: 7415626
Filing Date: 2008-08-19
Classification: G06F,Y02D

Abstract:
1. A method for activating operations of a communication device coupled to an external communication bus, comprising: detecting a communication event on the external communication bus at a wake up circuit while a host controller coupled to the external communication bus is in an inactive state; providing an interrupt signal to a processor of the communication device that is operating using a first clock signal running at a first clock rate from a first clock responsive to detection of the communication event by the wake up circuit; providing a clock enable signal from the processor of the communication device, responsive to the interrupt signal, to a second clock in an inactive state, the second clock being coupled to a second circuit of the communication device separate from the processor of the communication device; initiating active state operations of the second clock to generate a second clock signal at a second clock rate greater than the first clock rate responsive to the clock enable signal; and initiating operation of the host controller responsive to active state operations of the second clock.