Display Port (DP) sink device having main Phy circuit with plurality of DP connectors and plurality of AUX Phy circuits coupled to subsidiary link circuit

A signal processing circuit, complying with DisplayPort (DP) standard and operated in a display device which is as a DP sink device, comprising:

• a main physical circuit, configured to receive a first signal from a first DisplayPort connector which is connected to a first DisplayPort source device, wherein a plurality of DisplayPort connectors of the display device comprises the first DisplayPort connector and a second DisplayPort connector;
• a plurality of auxiliary physical circuits, wherein only a first auxiliary physical circuit of the plurality of auxiliary physical circuits is enabled to receive a second signal from the first DisplayPort connector connected to the first DisplayPort source device, and a physical layer comprises the main physical circuit and the plurality of auxiliary physical circuits;
• a main link circuit, coupled to the main physical circuit;
• a first auxiliary link circuit, coupled to the main link circuit and configured to receive a processed second signal which is originated from the second signal from the first DisplayPort connector connected to the first Display Port source device;
• a second auxiliary link circuit, coupled to the second DisplayPort connector which is not connected to the first DisplayPort source device;
• and
• a subsidiary link circuit, coupled to the second auxiliary link circuit and coupled to the second DisplayPort connector through the second auxiliary link circuit.