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Notes
PES48H12G2 User Manual
®
Introduction
As illustrated in Figures 10.1 through 10.3, a PCIe switch may be used in one of three hot-plug configu-
rations. Figure 10.1 illustrates the use of PES48H12G2 in an application in which two downstream ports are
connected to slots into which add-in cards may be hot-plugged.
Figure 10.2 illustrates the use of PES48H12G2 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 10.3 illustrates the use of PES48H12G2 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 function-
ality illustrated in both Figures 10.1 and 10.2, it will not be discussed further.
Figure 10.1 Hot-Plug on Switch Downstream Slots Application
Hot-Plug and Hot-Swap
Upstream
Link
Port 0
PES48H12G2
Master
SMBus
...
...
...
Port x
Port y
Hot-Plug Signals
Port x
Port y
Slot
Slot
10 - 1
Chapter 10
SMBus I/O
Expander
April 5, 2013
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