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A Memory Write or Message Request with the Relaxed Ordering Attribute bit clear (b’0) must not pass
any other Memory Write or Message Request.
A Memory Write or Message Request with the Relaxed Ordering Attribute bit set (b’1) is permitted to
pass any other Memory Write or Message Request.
Endpoints, Switches, and Root Complex may allow Memory Write and Message Requests to pass
Completions or be blocked by Completions.
Memory Write and Message Requests can pass Completions traveling in the PCI Express to PCI
directions to avoid deadlock.
If the Relaxed Ordering attribute is not set, then a Read Completion cannot pass a previously
enqueued Memory Write or Message Request.
If the Relaxed Ordering attribute is set, then a Read Completion is permitted to pass a previously
enqueued Memory Write or Message Request.
Read Completion associated with different Read Requests are allowed to be blocked by or to pass each
other.
Read Completions for Request (same Transaction ID) must return in address order.
Non-posted requests cannot pass other non-posted requests.
CfgRd0CfgRd0 can pass IORd or MRd.
CfgWr0 can IORd or MRd.
CfgRd0 can pass IORd or MRd.
CfrWr0 can pass IOWr.
Table 11-8: Transaction Ordering Rules
Can the Row Pass
the Column?
Posted Req Non Posted Req
Completion
Memory Write or
Message Req
Read Request I/O or Cfg Write Req
Spec Hard IP Spec Hard IP Spec Hard IP Spec Hard IP
P Posted
Req
No
Y/N
No
No
Yes Yes Yes Yes Y/N
Yes
No
No
NP
Read
Req
No No Y/N No Y/N No Y/N No
Non-
Posted
Req with
data
No No Y/N No Y/N No Y/N No
11-8
Receive Buffer Reordering
UG-01097_avst
2014.08.18
Altera Corporation
Transaction Layer Protocol (TLP) Details
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