T1042 - PCIe link Loopback Test

[skittikh]

Using T1042, would like to test the PCIe links by loopback the TX to RX.  Is there any internal registers of T1042 that we can use to verify whether the links are working?

[ufedor]

Digital loopback can be enabled by setting corresponding SerDes_LNnTCSR3[LPBK_EN]=0b01.

External loopback can be tested in application mode using external loopback add-in card or by connecting TX to RX signals through AC coupling capacitors at the backplane.