Description:
When SerDes is not used, there are proper states for unused pin.
Solution:
Connect VSSSD, Rx Differential Inputs, SD_EXTx_RefCLKx, SDQx_RefCLKx, and RefRETx to board ground. Then, leave VCCSD0, VCCPLLSD0, VCCAUX, SDx_REXT and Tx Differential Pair outputs open or unconnected.