Shown here is a simple loopback design with the T20 MIPI/CSI development kit. This board is shipped with this design pre-loaded. In this hello world demo, the designer connected the Tx to Rx on the T20. Pre-programmed into the board are some video color bar image patterns that are used to output. The color bar information is sent out of the Hardened CSI Transmit port internally in the fpga, and wraps around to the hardened CSI Receive port via the connected ribbon cable.  Knowing what that Data is, the FPGA confirms it’s correct, thereby testing the receive, transmit and the interconnect.