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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
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firmware and source code: rdf0190-kc705-ibert-c-2014-3.zip
White paper for the Xilinx FPGA IBERT and transceivers
wp428-7Series-Serial-Link-Signal-Analysis.pdf