IDT 89HPES24N3A, User Manual

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Notes
PES24N3A User Manual 8 - 1 April 10, 2008
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Chapter 8
Hot-Plug and Hot-Swap
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 PES24N3A 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
PES24N3A 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
PES24N3A 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 8.3,
it will not be discussed further.
Figure 8.1 Hot-Plug on Switch Downstream Slots Application
PES24N3A
Port 0
Port 1
Slot
Port 1 Port 2
Master
SMBus
SMBus I/O
Expander
Port 2
Slot
Upstream
Link
Hot-Plug Signals