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.
W ith the ex ception of therm al m anagement, if a device has a dem and upon it, full perform ance and
bandwidth will be given to that device for as long as the user demands it. Power management
should not cause the us er to sacrif ice perf ormanc e 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
specif ic peripher als can detec t the presenc e of power m anagem ent. However, in general, since the
device I/O is tr apped and the device m anaged in SMI, the power managem ent 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, therm al managem ent only comes into play when the resources of the computer are used
in such a way as to accum ulate heat and operate many devices at m aximum bandwidth to create a
therm al problem inside the unit. This therm al problem indic ates a danger of dam aging com ponents
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 m anagem ent is designed to operate and adapt to the us er while the user is using it.
It is the plug and play equivalent for power m anagem ent. T here are no entries in BIOS Setup which
are required to be set by the user in order to optim ize 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).