IDT PCI Express 89HPES32NT24xG2, User Manual, Page: 279 / 744

IDT Non-Transparent Switch Operation
PES32NT24xG2 User Manual 14 - 31 January 30, 2013
Notes
The following function-specific errors require that the offending TLP’s header be logged in the NT func-
tion’s AER capability structure.
– Reception of a request that is unsupported and is claimed by the NT function.
– Reception of an unexpected completion that is claimed by the NT function.
– Reception of a poisoned TLP on the upstream port’s link that is claimed by the NT function.
• When the TLP is not received on the link, header logging is not performed.
Transaction Layer Error Pollution
The error pollution rules for non-transparent operation are the same as for transparent operation. Refer
to section Transaction Layer Error Pollution on page 10-20 for further details.
NTB Inter-Partition Error Propagation
This section describes the PES32NT24xG2’s handling of error conditions that propagate across the
device during inter-partition transfers. This section builds upon the error handling concepts described above
for the NT function, as well as the error handling for transparent operation described in Chapter 10.
Figure 14.13 shows a basic configuration of the PES32NT24xG2 with two partitions connected by an
non-transparent bridge (NTB). Note that this is only a sample configuration chosen to illustrate the concepts
described in this section. These concepts are applicable to all other possible multi-partition configurations
allowed by the PES32NT24xG2.
Figure 14.13 Basic Non-Transparent PES32NT24xG2 Configuration
In the sample configuration shown in the figure, each partition is composed of three PCI-to-PCI (P2P)
bridge functions (i.e., a 3-port transparent switch). The NTB is associated with an NT function in each parti-
tion, and the upstream port of each partition is configured in Upstream Switch Port with NT Endpoint mode.
Note that both functions of the upstream port (i.e., PCI-to-PCI bridge function and NT function) connect
to the PCI Express link, as well as to each other. As described in section Non-Transparent Operation on
page 1-8, these functions may route TLPs to each other (i.e., an inter-function transfer).
1
Each of the logical functions shown in the figure has independent error detection and handling capabili-
ties. The PCI-to-PCI bridge functions perform error handling as described in Chapter 10, and the NT func-
tions performs error handling as described in the sections above.
1.
Note that inter-function transfers are not transmitted on the upstream port’s link.
Partition 0 – Virtual PCI Bus
P2P
Bridge
Upstream
Port
P2P
Bridge
P2P
Bridge
Non-Transparent
Interconnect
Upstream
Port
Partition 1 – Virtual PCI Bus
P2P
Bridge
P2P
Bridge
P2P
Bridge
NT
Endpoint
NT
Endpoint
Downstream Ports