IDT 89HPES12N3, User Manual

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Notes
PES12N3 User Manual 6 - 1 June 7, 2006
Chapter 6
Hot-Plug and Hot-Swap
Introduction
As illustrated in Figures 6.1 through 6.3, a PCIe® switch may be used in one of three hot-plug configura-
tions.
Figure 6.1 illustrates the use of the PES12N3 in an application in which the two downstream ports are
connected to slots into which add-in cards may be hot-plugged.
Figure 6.2 illustrates the use of the PES12N3 in an add-in card application. Here the two 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 6.3 illustrates the use of the PES12N3 in a carrier card application. In this application, the
two 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 Figure 6.1 and Figure 6.2, it will not be discussed further.
Figure 6.1 Hot-Plug on Switch Downstream Slots Application
PES12N3
Port A
Port B
Slot
Port B Port C
Master
SMBus
SMBus I/O
Expander
Port C
Slot
Upstream
Link
Hot-Plug Signals