Functional Description
182 Datasheet
5.14 System Management (D31:F0)
The PCH provides various functions to make a system easier to manage and to lower
the Total Cost of Ownership (TCO) of the system. Features and functions can be
augmented using external A/D converters and GPIO, as well as an external
microcontroller.
The following features and functions are supported by the PCH:
• Processor present detection
— Detects if processor fails to fetch the first instruction after reset
• Various Error detection (such as ECC Errors) indicated by host controller
— Can generate SMI#, SCI, SERR, NMI, or TCO interrupt
• Intruder Detect input
— Can generate TCO interrupt or SMI# when the system cover is removed
— INTRUDER# allowed to go active in any power state, including G3
• Detection of bad BIOS Flash (FWH or Flash on SPI) programming
— Detects if data on first read is FFh (indicates that BIOS flash is not
programmed)
• Ability to hide a PCI device
— Allows software to hide a PCI device in terms of configuration space through
the use of a device hide register (See Section 10.1.74)
Note: Voltage ID from the processor can be read using GPI signals.
5.14.1 Theory of Operation
The System Management functions are designed to allow the system to diagnose failing
subsystems. The intent of this logic is that some of the system management
functionality can be provided without the aid of an external microcontroller.
5.14.1.1 Detecting a System Lockup
When the processor is reset, it is expected to fetch its first instruction. If the processor
fails to fetch the first instruction after reset, the TCO timer times out twice and the PCH
asserts PLTRST#.
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