ZC706 Optical Loopback

[devradu]

Alex and Community,
We are completing the integration of the Verilog-Ethernet core into a design on the ZC706? The stock loopback has been bypassed for traditional transmit and receive and the core is configured for UDP. I can transmit and receive to and from a PC. However, when I attempt optical loopback with the ZC706 SFP, the transmit chain stalls. I am in the middle of debugging this issue (Focusing on ARP responses), but was hoping you might be able to provide additional suggestion as to where to focus. I have pulled out the majority of the status indicators into an ILA for monitoring, but don't see any flags that indicate what is going wrong.

Thanks,
Andrew

[devradu]

Please disregard, TX packets were backing up because the configured IP address was wrong and ARP was not succesful.