General Xilinx information
IBERT for 7 Series GTX Transceivers
https://www.xilinx.com/products/intellectual-property/ibert_7series_gtx.html
IBERT for UltraScale/UltraScale+ GTH Transceivers
https://www.xilinx.com/products/intellectual-property/ibert_ultrascale_gth.html
Xilinx Kintex-7 FPGA KC705 Evaluation Kit
https://www.xilinx.com/products/boards-and-kits/ek-k7-kc705-g.html
many useful information and example from the resources center:
the KC705 GTX IBERTÂ Tutorials: (Needs a Xilinx account to download the slides, firmware, and source code)