Switch Partitioning - Renesas IDT 89HPES48H12G2 User Manual

IDT Architectural Overview
Notes
PES48H12G2 User Manual

Switch Partitioning

The logical view of a PCIe switch is shown in Figure 2.2. A PCI switch contains one upstream port and
one or more downstream ports. Each port is associated with a PCI-to-PCI bridge. All
associated with a PCIe switch are interconnected by a virtual PCI bus.
– The primary side of the upstream port's
the secondary side connects to the virtual PCI bus.
– The primary side of a downstream port's
while the secondary side is associated with the external link.
P2P
Bridge
The PES48H12G2 is a partitionable PCIe switch. This means that in addition to operating as a standard
PCI express switch, the PES48H12G2 ports may be partitioned into groups that logically operate as
completely independent PCIe switches.
Figure 2.3 illustrates a three partition PES48H12G2 configuration.
Partition 1
Upstream Port
P2P
Bridge
Partition 1 – Virtual PCI Bus
P2P P2P
Bridge Bridge
Partition 1
Downstream Ports
bridge is associated with the external link, while
PCI-to-PCI
PCI-to-PCI
Upstream
Port
P2P
Bridge
Virtual PCI Bus
P2P P2P
Bridge Bridge
Downstream Ports
Figure 2.2 Transparent PCIe Switch
Partition 2
Upstream Port
Partition 2 – Virtual PCI Bus
P2P P2P P2P
Bridge Bridge Bridge
Partition 2
Downstream Ports
Figure 2.3 Partitionable PCI Express Switch
2 - 2
PCI-to-PCI
bridge is connected to the virtual PCI bus,
P2P
P2P
Bridge
Bridge
Partition 3
Upstream Port
P2P P2P
Bridge Bridge
Partition 3 – Virtual PCI Bus
P2P P2P
Bridge Bridge Bridge
Partition 3
Downstream Ports
April 5, 2013
bridges
P2P