AD9364 external RX->TX loopback

Hi everyone,

I've the AD9364 evaluation kit AD-FMCOMMS4-EBZ and I need to loopback the digital samples coming from RX into the TX digital inputs, without using any external FPGA.

So I need to link RX to TX digital pins, but I've many doubts with the couples to bridge and the connections for EN_AGC, ENABLE and TXNRX.

Also, I see there's several FMC loopback board such as this ( https://fmchub.github.io/projects/FMC_LOOPBACK/Datasheet/FMC_LOOPBACK_MODULE_datasheet.html ) and this ( https://www.xilinx.com/support/documentation/boards_and_kits/xtp090.pdf ) but I don't think they are good for my application.

I wish I can solder directly the testpoint for bridging, but there are no tags in the silkscreen.

Any idea or any schematic for how to implement digital external RX->TX loopback?

Thank you

Best regards

-Federico