Patent ID: 8732379

Claim:
An apparatus for adapting a pre-designed circuit module not supporting a power management protocol to a power management protocol, the pre-designed circuit module having a bus interface, a clock stop request input and a interrupt disable input, the apparatus comprising: a bus bridge circuit connected to the bus interface of the pre-designed circuit module and adapted for connection to an external bus, said bus bridge circuit including a disconnection circuit applicable to selectively connect the bus interface of the pre-designed circuit module and the external bus, said bus bridge circuit being further operable to determine when bus traffic is idle and generating a drained signal indicative of whether bus traffic is idle; an idle circuit having an external input operable to receive an idle request signal, an interrupt disable request output connected to the interrupt disable input of the pre-designed circuit module, said idle circuit generating said interrupt disable request upon receipt of said idle request signal; and a power management circuit having a clock stop output connected to the clock stop request input of the pre-designed circuit module operable to send a clock stop request signal to the pre-designed circuit module following said idle request signal, said power management circuit further having a drained input connected to said drained output of said bus bridge circuit, said power management circuit further operable to defer generation of said interrupt disable output until said drained signal indicates bus traffic is idle.