As soon as the application is executed, it checks if a Monitor is connected or not. If a monitor is already connected, then it starts up the following options as shown in the following figure to choose from (KC705).
Selecting either r
or s puts the system in Pass-Through mode, where the Video
received by RX is forwarded to TX. This configures the vid_phy_controller and sets up the DisplayPort for RX. If a DisplayPort source
(for example, GPU) is already connected to DP RX, then it starts the training. Else, the
training happens when the cable is plugged in. As soon as the training is completed, the
application starts the DP TX Subsystem. The video should be seen on the monitor once the TX is
up. The preceding figure shows the UART transcript. The transcript might differ based on the
training done by GPU.