1. A method for powering a transmitter component from an HDMI (High-Definition Multimedia Interface) port, the method comprising: receiving a current at the transmitter component from a plurality of differential HDMI signals from terminators on a receiver component; converting a portion of the received current to form a supply voltage Vdd source; and operating function logic on the transmitter component using the Vdd voltage, wherein the function logic is configured to control the plurality of differential signals.