AM5728: How to detect a PCIe fault

Tool/software:

I would like to determine the behavior of the PCIe driver when the error bit in the following register is set.
What operation or external factor sets this bit?

PCIECTRL_EP_DBICS_STATUS_COMMAND_REGISTER
    bit31 DETECT_PARERR
    bit30 SIGNAL_SYSERR
    bit29 RCVD_MASTERABORT
    bit28 RCVD_TRGTABORT
    bit27 SIGNAL_TRGTABORT
    bit27 SIGNAL_TRGTABORT