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®
®
Intel
Pentium
M Processor and Intel
®
Intel
82870P2 (Intel P64H2)
8.2.5
Hot-Plug Interrupt Routing Requirements
The recommended method to support Hot-Plug is to route the SCI interrupt output signal on the
®
Intel
P64H2 (pin PAIRQ7) to an available GPIO pin on the ICH3. A System Controlled Interrupt
(SCI) is a system interrupt used by hardware to notify the operating system of ACPI events. SCI is
an active-low, shareable, level-triggered interrupt.
8.2.6
Disabling/Enabling an Intel
8.2.6.1
Hot-Plug Strapping Options
The HPx_SLOT[2:0] strapping pins are used to enable and disable the Hot-Plug controller.
Table 74
enable.
Table 74.
Hot-Plug Mode
HPx_SLOT [2:0]
NOTES:
1. Refer to
2. Refer to
3. Refer to
8.2.6.2
Hot-Plug Registers' Visibility
The Hot-Plug controller function is completely hidden when the controller is disabled by the slot
strapping pins HPx_SLOT[2:0], and the registers are not available or accessible.
8.2.7
Single-Slot Parallel Mode
Single-slot parallel mode allows for only one card to be connected to the PCI/PCI-X Bus. This
mode should be used only to implement a one-slot Hot-Plug solution because of the behavior of the
PCI bus when in this mode. No serialization/deserialization logic is required for this mode of
operation.
8.2.7.1
Required Additional Logic
Single-slot parallel mode requires a power switch to be used to turn the slot power on and off.
Single-slot parallel mode does not require the use of a bus and clock switch. In this mode, all PCI
signals are driven to ground whenever a PCI card is to be disconnected.
136
®
E7501 Chipset Platform
lists the strapping options associated with these pins, and the modes of operation they
000
001
010
011
100
101
110
111
Section 8.2.7
for single-slot parallel mode operation.
Section 8.2.8
for dual-slot parallel mode operation.
Section 8.2.9
for serial mode operation.
®
P64H2 Hot-Plug Controller
Hot-Plug Mode
Hot-Plug Disabled
1-Slot (Parallel Mode)
2-Slot (Parallel Mode)
3-Slot (Serial Mode)
4-Slot (Serial Mode)
5-Slot (Serial Mode)
6-Slot (Serial Mode)
Reserved
Notes
1
2
3
3
3
3
Design Guide
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