IDT 89HPES64H16G2 User Manual page 134

IDT Theory of Operation
Notes
PES64H16G2 User Manual
ACS Source
Validation
(TLP is
dropped at this
point)
Figure 9.2 shows an example of ACS peer-to-peer request re-direct at a downstream port. In this case,
the offending TLP received by the downstream port is re-directed towards the root-complex.
ACS Peer-to-
Peer Request
Re-direct
Figure 9.2 ACS Peer-to-Peer Request Re-direct at a Downstream Port
Figure 9.3 shows an example of ACS upstream forwarding at a downstream port. As with ACS Peer-to-
Peer forwarding, the offending TLP received by the downstream port is re-directed towards the root-
complex.
Upstream
Port
P2P
Bridge
Partition 1 – Virtual PCI Bus
P2P P2P
Bridge Bridge
Downstream Ports
Figure 9.1 ACS Source Validation Example
Upstream
Port
P2P
Bridge
Partition 1 – Virtual PCI Bus
P2P P2P
Bridge Bridge
Downstream Ports
9 - 4
TLP route
Completion with
completer-abort status
Intended TLP Route
ACS Re-directed Route
April 5, 2013