https://docs.amd.com/v/u/en-US/chipscope_ibert_virtex7_gtx
ChipScope Integrated Bit Error Ratio Test (IBERT) for Virtex-7 GTX (v2.00.a) Data Sheet(DS867) -...
The ChipScope Pro IBERT core for Virtex-7 FPGA GTX transceivers is customizable and designed for evaluating and monitoring Virtex-7 FPGA GTX tranceivers.