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Notes
PES4T4 User Manual
®
Introduction
As illustrated in Figures 8.1 through 8.3, a PCIe switch may be used in one of three hot-plug configura-
tions. Figure 8.1 illustrates the use of the PES4T4 in an application in which two downstream ports are
connected to slots into which add-in cards may be hot-plugged. Figure 8.2 illustrates the use of the PES4T4
in an add-in card application. Here the downstream ports are hardwired to devices on the add-in card and
the upstream port serves as the add-in card's PCIe interface. In this application the upstream port may be
hot-plugged into a slot on the main system. Finally, Figure 8.3 illustrates the use of the PES4T4 in a carrier
card application. In this application, the downstream ports are connected to slots which may be hot-plugged
and the entire assembly may be hot-plugged into a slot on the main system. Since this application requires
nothing more than the functionality illustrated in both Figures 8.1 through 8.2, it will not be discussed further.
Figure 8.1 Hot-Plug on Switch Downstream Slots Application
Hot-Plug and Hot-Swap
Upstream
Link
Port 0
PES4T4
Master SMBus
Clock and Data
...
...
...
Port x
Port y
Hot-Plug Signals
Port x
Port y
Slot
Slot
8 - 1
Chapter 8
SMBus I/O
Expander
February 1, 2011
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