Intel VC820 Design Guide - Page 21
Manageability, TCO Timer, CPU Present Indicator, ECC Error Reporting, Function Disable - modem
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Introduction 1.4.5 Manageability The Intel® 820 chipset platform integrates several functions designed to manage the system and lower the total cost of ownership (TCO) of the system. These system management functions are designed to report errors, diagnose the system, and recover from system lockups 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# which 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. CPU Present Indicator The ICH looks for the CPU to fetch the first instruction after reset. If the CPU does not fetch the first instruction, the ICH will reboot the system at the safe-mode frequency multiplier. ECC Error Reporting Upon detecting an ECC error, the MCH can send one of several messages to the ICH. The MCH can instruct the ICH to generate either an SMI#, NMI#, SERR#, or TCO interrupt. Function Disable The ICH provides the ability to disable the following functions: AC'97 Modem, AC'97 Audio, IDE, USB or SMBus. Once disabled, these functions no longer decode I/O, memory, or PCI configuration space. Also, no interrupts or power management events are generated from the disabled functions. Intruder Detect The ICH provides an input signal (INTRUDER#) that can be attached to a switch that is activated by the system case being opened. The ICH can be programmed to generate an SMI# or TCO interrupt due to an active INTRUDER# signal. SMBus The ICH integrates an SMBus controller. The SMBus provides an interface to manage peripherals (e.g., serial presence detection (SPD) on RIMMs and thermal sensors). Alert on LAN* The ICH supports Alert on LAN*. In response to a TCO event (intruder detect, thermal event, CPU not booting) the ICH sends a message over ALERTCLK and ALERTDATA. A LAN controller can decode this alert message and send a message over the network to alert the network manager. Intel®820 Chipset Design Guide 1-9