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Product Description

1.13.3 Chassis Intrusion and Detection

The boards support a chassis security feature that detects if the chassis cover is removed. For the

chassis intrusion circuit to function, the chassis’ power supply must be connected to AC power.

The security feature uses a mechanical switch on the chassis that attaches to the chassis intrusion

connector. The mechanical switch is closed for normal computer operation.

For information about Refer to

The location of the chassis intrusion connector Figure 12, page 60

The signal names of the chassis intrusion connector Table 33, page 62

✏

NOTE

Chassis intrusion detection may be implemented using third-party software.

1.14 Power Management

Power management is implemented at several levels, including:

• Software support through Advanced Configuration and Power Interface (ACPI)

• Hardware support:

 Power connector

 Fan connectors

 LAN wake capabilities

 Instantly Available PC technology

 Resume on Ring

 Wake from USB

 Wake from PS/2 devices

 Power Management Event (PME#) wake-up support

1.14.1 ACPI

ACPI gives the operating system direct control over the power management and Plug and Play

functions of a computer. The use of ACPI with the D845HV and D845WN boards requires an

operating system that provides full ACPI support. ACPI features include:

• Plug and Play (including bus and device enumeration)

• Power management control of individual devices, add-in boards (some add-in boards may

require an ACPI-aware driver), video displays, and hard disk drives

• Methods for achieving less than 15-watt system operation in the power-on/standby

sleeping state

• A Soft-off feature that enables the operating system to power-off the computer

• Support for multiple wake-up events (see Table 10 on page 40)

• Support for a front panel power and sleep mode switch.

Table 8 lists the system states based on how long the power switch is pressed, depending on how

ACPI is configured with an ACPI-aware operating system.

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 152 153

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