About pins in daughter board $ FPGA in USRP

Dear all

I am wondering if we can read the information from some special pins in
daughter board? Right now I can control some pins On/Off in daughter but
don’t how to read the information from those pins.

Can I just program the FPGA in the USRP to achieve some new functions
through xilinx and verilog language. I want to create a Photon Counter.

Thank you for your reply and time.


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