How Errors are Reported
PCI Express includes two methods of reporting errors:
error message transactions — used to report errors to the host
completion status — used by the completer to report errors to the requester
Each reporting mechanism is described below.
Error Messages
As discussed previously, PCI reports errors via the PERR# and SERR# signals. Because PCI Express eliminates theses error-related signals, error messages have been defined to replace these signals by acting as virtual wires. Furthermore, these messages provide additional information that could not be conveyed directly via the PERR# and SERR# signals. This includes identification of the device that detected the error and an indication of the severity of each error.
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