Bidirectional transmission of USB data using audio/video data channel

A method of transmitting data over a multimedia link, comprising:

• over a first physical channel of the multimedia link:
• receiving forward units of data from a source device by a sink device during one or more first time periods, the forward units of data comprising video data and forward communication data compliant with a first standard comprising a universal serial bus (USB) standard and different from a standard of the video data;
• sending backward units of data from the sink device to the source device during one or more second time periods, the backward units of data comprising backward communication data compliant with the first standard;
• and
• over a second physical channel of the multimedia link distinct from the first physical channel:
• receiving control data from the source device to the sink device.

A source device for communicating data with a sink device over a multimedia link, comprising:

• a transmitter coupled to a first physical channel of the multimedia link and configured to send forward units of data from the source device to the sink device over the first physical channel during one or more first time periods, the forward units of data comprising video data and forward data compliant with a first standard comprising a universal serial bus (USB) standard and different from a standard of the video data;
• a receiver coupled to the first physical channel and configured to receive backward units of data at the source device from the sink device over the first physical channel during one or more second time periods, the backward units of data comprising backward data compliant with the first standard;
• and
• a control signal transceiver coupled to a second physical channel of the multimedia link distinct from the first physical channel and configured to at least send control data from the source device to the sink device over the second physical channel.

A non-transitory computer readable storage medium storing instructions thereon, the instructions representing a digital design of a circuit comprising:

• a transmitter coupled to a first physical channel of the multimedia link and configured to send forward units of data from a source device to a sink device over the first physical channel during one or more first time periods, the forward units of data comprising video data and forward data compliant with a first standard comprising a universal serial bus (USB) standard and different from a standard of the video data;
• a receiver coupled to the first physical channel and configured to receive backward units of data at the source device from the sink device over the first physical channel during one or more second time periods, the backward units of data comprising backward data compliant with the first standard;
• and
• a control signal transceiver coupled to a second physical channel of the multimedia link distinct from the first physical channel and configured to at least send control data from the source device to the sink device over the second physical channel.