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1-24 Service Guide
Device Device ID Assignment
MTXC North Bridge 0 AD11
PIIX4 ISA Bridge 1 AD18 (Function 0)
PIIX4 IDE controller 1 AD18 (Function 1)
PIIX4 USB controller 1 AD18 (Function 2)
PIIX4 PM/SMBUS controller 1 AD18 (Function 3)
PCI VGA(NM2160) 2 AD13
PCI Cardbus controller A AD21
PCI Ethernet (Am79C970A) (ACER Dock III) C AD23
PCI CardBus (TI 1131) (ACER Dock V) C AD23
1.6.7 Power Management
Power Management in this design is aimed toward the conservation of power on the device and
system level when the devices or system is not in use. This implies that if any device is detected as
not active for a sustained period of time, the device will be brought to some lower power state as
soon as practicable.
With the exception of thermal management, if a device has a demand upon it, full performance and
bandwidth will be given to that device for as long as the user demands it. Power management
should not cause the user to sacrifice performance or functionality in order to get longer battery life.
The longer battery life should be obtained through managing resources not in use.
Pathological cases of measuring CPU speed or trying to periodically check for reaction time of
specific peripherals can detect the presence of power management. However, in general, since the
device I/O is trapped and the device managed in SMI, the power management of devices should be
invisible to the user and the application.
Thermal management is the only overriding concern to the power management architecture. By
definition, thermal management only comes into play when the resources of the computer are used
in such a way as to accumulate heat and operate many devices at maximum bandwidth to create a
thermal problem inside the unit. This thermal problem indicates a danger of damaging components
due to excessively high operating temperatures. Hence, in order to maintain a safe operating
environment, there may be occasions where we have to sacrifice performance in order to achieve
operational safety.
Heuristic power management is designed to operate and adapt to the user while the user is using it.
It is the plug and play equivalent for power management. There are no entries in BIOS Setup which
are required to be set by the user in order to optimize the computers battery life or operation. The
only BIOS Setup entries are for condition information for suspend/resume operations. Normal
operations and power management are done automatically. (see chapter 3 for details).
Since the power management is implemented by linking with APM
interface closely, the APM function in Win95 or Win3.1 must be
enabled and set to advanced level for optimum power management
and the driver that installed in system must be Acer authorized and
approved.