Altera Stratix V Avalon-ST - Manual (Page 194)

Figure 11-2: PCI Express Design Using Relaxed Ordering
Root
Complex
PCIe
Endpoint
Switch
Write Buffer
Full
CPU
Memory
PCIe Bridge to
PCI or PCI-X
Legacy
Endpoint
PCIe
Endpoint
PCIe
Endpoint
PCI/PCI-X
Blocked by
Full WR Buffer
Posted
Write
Completion
for Memory
Read
5. If your analysis indicates that you can enable relaxed ordering, simulate your system with and without
relaxed ordering enabled. Compare the results and performance.
6. If relaxed ordering improves performance without introducing errors, you can enable it in your
system.
UG-01097_avst
2014.08.18
Using Relaxed Ordering 11-11
Transaction Layer Protocol (TLP) Details Altera Corporation
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