On behalf of a customer wanting to use FMCDAQ2 board, but must use their own FPGA code: "How do I get my hands on FPGA verilog code for JESD204B? Hopefully it would be for the XC7V2000TFLG1925-1 virtex7 FPGA. Even a black box would be acceptable."
The JESD204B core we use with our Xilinx designs is provided by Xilinx:
Xilinx should be able to give you more information regarding it.