Hi,
As I understand it, you have some inquiries related to the CV GX XCVR. From your description, I understand that your selected device has 3 XCVR channels. If I understand it correctly, you are trying to instantiate two separate PHY instance and fit into the 3 XCVR channels. Before we proceed, mind sharing on what is the specific PHY IP that you are using and also the TX PLL used? This would be helpful for me to provide further comment. For example, if you are using CMU PLL, you would need to ensure TX PLL merging to successfully fit into the 3 CHs.
Thank you.