Intel Xeon User Manual

Intel
®
82870P2 (P64H2)
102 Design Guide
8.2.2.2 Optional Attention Button
The Attention Button state is observed on the slot-specific HxPRSNT1# pin. An exclusive-OR
(XOR) gate is inserted between the Slot Present signal and the Hot Plug Controller as shown in
Figure 8-8. A momentary contact button is connected to the other input of the XOR gate. When the
button is in the released state, the Slot Present signal is unaffected. When the button is actively
being pressed/asserted, the Slot Present signal is inverted, signaling the Hot Plug Controller to
commence slot power up/down sequence.
8.2.3 LED Indicator Outputs
The PCI Hot-Plug Standard Usage Model assumes that the Platform provides two indicators per
slot. Indicators must be placed in close proximity to their associated slot so that the association
between the indicators and the hot-plug slot is clear.
The LED output signals for all modes of P64H2 Hot Plug Controller operation are active high. In
all cases, the green LED is the power indicator, and the amber LED is the attention indicator.
Figure 8-8. Attention Button Implementation
Intel
®
P64H2
HxSWITCH
HxPRSNT1#
HxPRSNT2#
3.3V
3.3V
Slot Present 1
Slot Present 2
MRL Sensor
Attention
Button
XOR
Slot
330 Ω
1 kΩ
3.3V
10 kΩ
5.6 kΩ
5.6 kΩ

Intel Xeon Specifications

General

Brand	Intel
Model	Xeon
Category	Processor
Language	English