IDT 89HPES34H16, User Manual, Page: 34 / 182

IDT PES34H16 Device Overview
PES34H16 User Manual 1 - 16 October 30, 2008
Notes
Figure 1.4 Three Ports Merged Configuration
Disabled Ports
The PES34H16 may be configured to disable one or more ports. Disabling a port has the following
effect.
– All of the output signals associated with a disabled port remain in a negated state (e.g., hot plug
outputs, link status signals, port reset output, etc.)
– All input signals associated with a disabled port are ignored by the PES34H16 and have no effect
on its operation. For example, if port 5 is disabled, the P45MERGEN has no effect on the
PES34H16.
– Configuration read or write transactions to a device that corresponds to a disabled port on the
PES34H16’s virtual PCI bus are treated by the upstream port (port 0) as an unsupported request
(i.e., the device no longer exists).
All registers associated with a disabled port become inaccessible via the SMBus. Reading or writing a
disabled port’s register has an undefined effect.
PES34H16
PCI to PCI
Bridge
PCI to PCI
Bridge
PCI to PCI
Bridge
Dev. 2
Dev. 4
PCI to PCI
Bridge
PCI to PCI
Bridge
Dev. 6
Dev. 7
PCI to PCI
Bridge
Dev. 8
PCI to PCI
Bridge
Dev. 15
Dev. 0
Port 0
Virtual PCI Bus
x8
Port 2
x8
Port 4
x8
Port 6
x1
Port 7
x1
Port 8
x1
Port 15
x1
...
...