If you have TX and RX bands, I would suggest doing a loop test. FPGA will produce data on the TX channel, receive it on the RX and compare the results.
To do this, you can connect the TX bands to the RX lines on the PCB connector and use the Iber FPGA core, which will automatically create transmission, reception and comparison circuits and give good results for each band.
For the 7th series, there is a link to the Ibert core http://www.xilinx.com/products/intellectual-property/ibert_7series_gtx.html
For other families, Ibert is also available.
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