https://docs.amd.com/v/u/3.0.1-English/ug752_12_3
SP623 IBERT Getting Started Guide (ISE 12.3) - 3.0.1 English - A procedure for setting up the SP623...
A procedure for setting up the SP623 Spartan-6 FPGA GTP Transceiver Characterization Board to run the Integrated Bit Error Ratio Test (IBERT) demonstration.