Patent ID: 8478921

Claim:
A communication apparatus comprising: a radio frequency (RF) circuit adapted to be activated for operating on a radio frequency signal during a radio active mode and be inactive during a radio inactive mode; and a digital processing circuit coupled to the RF circuit, wherein the digital processing circuit includes: a first bus master coupled to a bus; one or more other bus masters coupled to the bus; and a bus arbiter configured to arbitrate requests to access the bus by the first bus master and the one or more other bus masters; wherein bus accesses by the one or more other bus masters are restricted in response to a signal asserted a predetermined amount of time prior to the RF circuit being activated; and wherein during the predetermined amount of time, the first bus master obtains access to the bus to perform necessary shut-down tasks prior to the digital processing circuit shutting down; and wherein the digital processing circuit shuts down at the end of the predetermined amount of time, for a window of time, while the RF circuit operates on the radio frequency signal.