2.5G and 5G Support?

[hopethis]

Hi,
I was wondering if this code base was tested with 5G or 2.5G Ethernet. I am asking because a lot of cheaper FPGAs include serdes transceivers which reach speeds below 10Gbit like xilinx GTP and GTR. Since the 5G and 2.5G are just downscaled versions of 10G all the pcs pma is the same. Did anyone get a such a system running using an GTP or GTR? All the example designs using ARTIX7 semmes to have special phy-ics on the pcb like Marvell 88E1111, TI DP83848J etc.

[alexforencich]

5G is half-rate 10G, so this should be doable. 2.5G is 2.5x 1G. Currently there is no SGMII or 1000BASE-X PHY in this repo; that would have to be written first to support 2.5G. I have also been looking in to running a 10G link at 1G via oversampling, which would also require a 1000BASE-X PCS. But, there is also the question of PHY attach if you want to do BASE-T instead of fiber. I have looked in to USXGMII and it seems like this shouldn't be too difficult to support as it's basically just a 10G MAC + PHY where the MAC duplicates symbols to hit the target line rate. Not sure about other PHY attach protocols offhand.

It should be possible to use GTP, but GTR are part of the Zynq SoC and hence are not usable from the FPGA fabric.

[hopethis]

Thanks for your fast reply! Yes your right, GTR was nonsense! I am personally interested in running 5G on an Artix7 Board I have lying around. This one only has GTP transceiver. The nice thing is I ve got a SFP adapter board as well which can be connected to it; so I can use an RJ45-SFP+ adapter which also supports lower speed rates (5G in this case). I guess I have to adapt/add a few things like auto negotiation though. Anyway, thanks again for your estimation. I will try to get it running, if I succeed Ill post the results here :)