Patent ID: 6601178
Filing Date: 2003-07-29
Classification: G06F,Y02D

Abstract:
A method of providing an indication to a first integrated circuit that a wake-up event has been detected by a second integrated circuit, the first and second integrated circuits being coupled by a bus having signal lines including a bus clock, a data in signal line and a data out signal line, the method comprising:placing the bus in a reduced power consumption state wherein the signal lines, including the bus clock, are inactive; signaling the existence of the wake-up event to the first integrated circuit by changing at least one signal line of the bus from a first voltage level to a second voltage level while the bus clock is inactive, in response to the wake-up event detected by the second integrated circuit; changing the bus from the reduced power consumption state to a normal power consumption state in response to the one signal line being at the second voltage level, the normal power consumption state including the bus clock being active; and operating the bus in the normal power consumption state in which the signal lines transmit information in synchronism with the bus clock.