Intel 815 - Manual (Page 22)

Introduction
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22 Intel
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815 Chipset Platform Design Guide
1.3.3.6 Manageability
The Intel 815 chipset platform integrates several functions designed to manage the system and
lower the system’s total cost of ownership (TCO) of the system. These system management
functions are designed to report errors, diagnose the system, and recover from system lock-ups,
without the aid of an external microcontroller.
TCO Timer
The ICH integrates a programmable TCO Timer. This timer is used to detect system locks. The
first expiration of the timer generates an SMI# that the system can use to recover from a software
lock. The second expiration of the timer causes a system reset to recover from a hardware lock.
Processor Present Indicator
The ICH looks for the processor to fetch the first instruction after reset. If the processor does not
fetch the first instruction, the ICH will reboot the system.
Function Disable
The ICH provides the ability to disable the following functions: AC’97 Modem, AC’97 Audio,
IDE, USB, and SMBus. Once disabled, these functions no longer decode I/O, memory or PCI
configuration space. Also, no interrupts or power management events are generated by the
disabled functions.
Intruder Detect
The ICH provides an input signal (INTRUDER#) that can be attached to a switch that is activated
when the system case is opened. The ICH can be programmed to generate an SMI# or TCO event
as the result of an active INTRUDER# signal.
Alert on LAN*
The ICH supports Alert on LAN. In response to a TCO event (intruder detect, thermal event,
processor boot failure), the ICH sends a hard-coded message over the SMBus. A LAN controller
supporting the Alert on LAN protocol can decode this SMBus message and send a message over
the network to alert the network manager.