Due to a problem in the Quartus® Prime software, the PRBS and rx_serial_loopback functions in the Transceiver ToolKit (TTK) are not functional.
This is due to the ADME block not including the PRBS and Control & Status registers, causing PRBS and rx_serial_loopback to be non-functional in the TTK. Only the Transceiver PMA settings in TTK are functional.
This problem is scheduled to be fixed in a future version of the Quartus Prime software, by including the PRBS and Control & Status registers as part of the ADME.