If data is not being transmitted or received, check the following conditions:
•If transmit <interface_name>_tready is stuck Low following the <interface_name>_tvalid input being asserted, the subsystem cannot send data.
•If the receive <interface_name>_tvalid is stuck Low, the subsystem is not receiving data.
•Check that the video_aclk and dphy_clk_200M inputs are connected and toggling.
•Check subsystem configuration.