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TSchu3's avatar
TSchu3
Icon for Occasional Contributor rankOccasional Contributor
2 years ago

Arria 10 Gx board, SFP connection no link

Hello all, I am attempting to bring up a link on a new Arria 10 Gx board, using the SFP+ connector. I started by generating an example design for the Low Latency Mac, with the 1G/2.5G Ethernet Examp...
Fpga Devkit
TSchu3's avatar
TSchu3
Icon for Occasional Contributor rankOccasional Contributor
2 years ago

Hello, using signal tap I monitor the 'operating_speed' port.
If I plug the dev board into a 1G only capable device. The link comes up and I can send data across the link.
However the 'operating_speed' port still shows '000' which means 10G.
I get the same result if I plug it into a 2.5G only switch or a 10G only switch. The port always reads 10G.

I am not doing anything internally to the PHY. This is all automatic. It should tell me what speed it is connected at. I would have no other way of knowing the speed from the FPGA fabric perspective.

Thanks