DP Tx interface with GT Quad base Controller for Versal:

The DP 1.4 Tx Subsystem is a MAC subsystem which works with a GT Quad Base Controller (PHY) to create a video connectivity system. The DP 1.4 Tx Subsystem is tightly coupled with the Xilinx Video PHY Controller, which itself is independent and offers flexible architecture with multiple-protocol support. Both MAC and PHY are dynamically programmable through the AXI4-Lite interface.

Figure 3. Block diagram of MAC Interface with PHY for Versal