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For AC power loss, the system operation is defined by register settings in the Intel
ICH6-M. Upon the return of power, a BIOS option, set prior to the power loss, allows
the system to either go immediately to the S5 state, or reboot to the Full-On state, no
matter what the state was before the power loss. External logic for this functionality is
not necessary. If the BIOS remains in the S5 state after AC power loss, only the power
button or the RTC alarm can bring the system out of the S5 state. The status of enabled
wake events will be lost.
3.7
Power Measurement Support
Power measurement resistors are provided on the platform to measure the power of
most subsystems. All power measurement resistors have a tolerance of 1%. The value
of these power measurement resistors are 2 mΩ by default. Power on a particular
subsystem is calculated using the following formula:
It is recommended that the user use a high precision digital multi-meter tool such as
the Agilent* 34401A digital multi-meter. Such a meter has 6½ digits of accuracy and
can provide a much greater accuracy in power measurement that a common 3½ digit
multimeter.
Table 6
summarizes all the power measurement sense resistors located on the Mobile
®
Intel
915GME Express Chipset platform. All sense resistors are 0.002 Ω unless
otherwise noted.
Table 6.
Mobile Intel
Voltage Groups
1.0
1.5
1.5 Always
1.5 Switched
®
Mobile Intel
915GME Express Chipset
Development Kit User's Manual
30
Mobile Intel
=
P
R is the value of the sense resistor (typically 0.002 Ω)
V is the voltage measured across the sense resistor.
®
915GME Express Chipset Voltage Rails (Sheet 1 of 4)
Voltage Rail
+V1
NC1-6_R
+V1.5
+V1.5_VCCAUX
+V1.5A
+V1.5A_ICH
+V1.5S
+V1.5S_DLVDS
+V1.5S_DDRDLL
+V1.5S_S_PCIE
+V1.5S_3GPLL (0.5Ω)
+V1.5S_MPLL
+V1.5S_HPLL
+V1.5S_DPLLA
+V1.5S_DPLLB
+V1.5S_HMPLL
®
915GME Express Chipset —Theory of Operation
2
V
R
Reference
Designator
U8A2.6
R8A3.2
Q3J2.1-3
R7V1.1
R3J12.2
R7V2.1
Q3Y1.1-3
R5U15.1
C5R3.1
C5T7.2
R6R1.1
C4T1.1
C4R7.1
C5T12.1
C5T9.1
R4D1.2
April 2007
Order Number: 317230-001US
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