SerDes and PCIe clarifications

Hi,
In jetson T5000, Can you tell me what is the bandwidth of SerDes lanes in general (Not PCIe, USB). Also, In PCIe Could you tell me if the x2 or x4 supported controller can be split and used as 2 x1 lanes or 4 x1 lanes ?

For example- The datasheet says- Controller #3 can operate in x1, x2 mode, Can i configure this as 2 x1 lanes ?

Can you be more specific about which interfaces you mean?

The Jetson Thor Series Modules Interface Design Guide shows the supported PCIe configurations:

These are the only PCIe configurations allowed. So for example, the PCIe x2 on C3 cannot be split into two separate PCIe x1 and the PCIe x4 on C5 cannot be split into two separate PCIe x2.