Datasheet
Reliability, Availability, Serviceability (RAS)
Intel
®
Xeon
®
Processor C5500/C3500 Series
Datasheet, Volume 1 February 2010
410 Order Number: 323103-001
11.7.2.1 PCI Express Hot Plug Interface
Table 130 describes how Intel
®
Xeon
®
processor C5500/C3500 series provides these signals serially
to external controller, these signals are controlled and reflected in the PCIe root port hot plug
registers.
Figure 80. IIO PCI Express Hog Plug Serial Interface
Table 130. Hot Plug Interface (Sheet 1 of 2)
Signal
Name
Description Action
ATNLED
This indicator is connected to the Attention
LED on the baseboard. For a precise
definition see the PCI Express Base
Specification, Revision 1.1.
Indicator can be off, on, or blinking. The
required state for the indicator is specified
with the Attention Indicator Register. IIO
blinks this LED at 1 Hz.
PWRLED
This indicator is connected to the Power LED
on the baseboard. For a precise definition see
the PCI Express Base Specification, Revision
1.1.
Indicator can be off, on, or blinking. The
required state for the indicator is specified
with the Power Indicator Register. The IIO
blinks this LED at 1 Hz.
BUTTON#
Input signal per slot which indicates that the
user wishes to hot remove or hot add a PCIe
card/module.
If the button is pressed (BUTTON# is
asserted), the Attention Button Pressed Event
bit is set and either an interrupt or a general-
purpose event message Assert/
Deassert_HPGPE to the PCH is sent.
1
IIO
IO Extender 0
100 KHz SM Bus
PEX Root
Port
(P2P bridge, HPC)
PCH
MSI
GPE
8
Button
LED
IO Extender 1
VPP
8
Button
LED
Slot 1
Slot 2
8
Button
LED
8
Button
LED
Slot 3 Slot 4
A1 A0
A2
A1 A0
A2
CPU + Uncore