Patent ID: 8275914

Claim:
A method comprising: detecting a transition of a control bus from a high state to a low state by a source device, the source device being configured to be coupled with a sink device via an interface, the interface including the control bus and a voltage bus, the source device including a resistive pullup device to be connected to the control bus and the sink device including a resistive pulldown device to be connected to the control bus; upon detecting by the source device of the transition of the control bus from the high state to the low state, pulsing the control bus to the high state at the source device; upon detecting by the source device that the control bus remains in the high state after pulsing of the control bus to the high state, the control bus remaining in the high state as a result of the sink device disconnecting the resistive pulldown device, then: ceasing the pulsing of the control bus to the high state, and transitioning the source device from a disconnected state to a connected state; and upon the source device detecting that a power source on the voltage bus is disabled for a certain time period while the source device is in the connected state, the source device transitioning from the connected state back to the disconnected state.