Table 9.4 Prioritization Of Acs Checks For Request Tlps - Renesas IDT 89HPES48H12G2 User Manual

IDT Theory of Operation
Notes
PES48H12G2 User Manual
Partition 1 – Virtual PCI Bus
Bridge
When multiple ACS checks are enabled, they are prioritized as described below. Table 9.4 shows the
prioritization for ACS checks associated with the reception of request TLPs. Table 9.5 shows the prioritiza-
tion for ACS checks associated with the reception of completion TLPs.
ACS Check
ACS Source Validation
ACS Translation Block-
ing
ACS Upstream For-
warding
ACS Peer-to-Peer
Request Redirect
ACS Peer-to-Peer
Egress Control
ACS Direct Translated
Peer-to-Peer

Table 9.4 Prioritization of ACS Checks for Request TLPs

Upstream
Port
P2P
Bridge
ACS Upstream
Forwarding
P2P P2P
Bridge
Downstream Ports
Figure 9.3 ACS Upstream Forwarding Example
Priority
4 Applicable to request TLPs received by a down-
(Highest) stream port on its ingress link.
3 Applicable to memory request TLPs received by
a downstream port on its ingress link.
2 Applicable to request or completion TLPs
received by the downstream port on its ingress
link that target the port's egress link. This is not
considered a peer-to-peer transfer.
1 Applicable to peer-to-peer request TLPs only
(Lowest) Subject to the interaction rules in Section 6.12.3
of the PCI Express 2.0 Specification.
9 - 5
Intended TLP Route
ACS Re-directed Route
Comment
April 5, 2013