Request
Request
Request
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• The scenario is: as a <strong>Request</strong>er,<br />
− It sends a request TLP out to a completer, which could be RC or EP<br />
− The completer for some reason treats this request as an Unsupported <strong>Request</strong>:<br />
If the original request TLP is Posted, the completer discards this UR request, however will<br />
return NO completion. It may send PCIe error message toward the RC.<br />
If the original request TLP is Non-Posted (MRd for example), the completer will return a<br />
Completion with UR status.<br />
<strong>Request</strong>er<br />
Root<br />
Complex<br />
or<br />
Switch<br />
I am here!<br />
Why do you send me<br />
an UR Completion?<br />
TM<br />
UR<br />
Completion<br />
TLP<br />
41<br />
MRd <strong>Request</strong><br />
TLP<br />
ERR_x<br />
Message<br />
PCIe Error Message<br />
Completer<br />
End<br />
point<br />
Freescale, the Freescale logo, AltiVec, C-5, CodeTEST, CodeWarrior, ColdFire, ColdFire+, C-Ware, the Energy Efficient Solutions logo, Kinetis,<br />
mobileGT, PowerQUICC, Processor Expert, QorIQ, Qorivva, StarCore, Symphony and VortiQa are trademarks of Freescale Semiconductor, Inc.,<br />
Reg. U.S. Pat. & Tm. Off. Airfast, BeeKit, BeeStack, CoreNet, Flexis, MagniV, MXC, Platform in a Package, QorIQ Qonverge, QUICC Engine,<br />
Ready Play, SafeAssure, the SafeAssure logo, SMARTMOS, TurboLink, Vybrid and Xtrinsic are trademarks of Freescale Semiconductor, Inc. All<br />
other product or service names are the property of their respective owners. © 2012 Freescale Semiconductor, Inc.
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