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• The scenario is: as a Completer,<br />
− It receives a Unsupported <strong>Request</strong> TLP from the original transaction <strong>Request</strong>er (or<br />
Initiator)<br />
− It can send an ERR_FATAL or ERR_NONFATAL Error Message (depending on severity<br />
setting) toward RC, if error reporting is enabled with either Command Register<br />
[SERR_EN] or Device Control Register [URR and FER or NFER], regardless the TLP<br />
type<br />
− It may return a Completion with UR status if the UR TLP type is Non-Posted<br />
<strong>Request</strong>er Completer<br />
Root<br />
Complex<br />
or<br />
Switch<br />
TM<br />
UR<br />
Completion<br />
TLP<br />
MRd <strong>Request</strong><br />
ERR_x<br />
Message<br />
TLP<br />
PCIe Error Message<br />
39<br />
I am here!<br />
I am going to<br />
treat you as UR!<br />
End<br />
point<br />
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