NH82801HEM S LB9B Intel, NH82801HEM S LB9B Datasheet - Page 78

• Manufacturer Part Number: NH82801HEM S LB9B
• Manufacturer: Intel

Specifications of NH82801HEM S LB9B

• Lead Free Status / RoHS Status: Compliant

Table 19.
2.16
Table 20.
78
System Management Interface Signals (Sheet 2 of 2)
Real Time Clock Interface
Real Time Clock Interface
AC_PRESENT
(Mobile Only)/
WOL_EN /
RTCX1
RTCX2
Name
GPIO14
Name
GPIO9
Special
Special
Type
Type
I/O
O
Crystal Input 1: This signal is connected to the 32.768 kHz crystal. If
no external crystal is used, then RTCX1 can be driven with the desired
clock rate.
Crystal Input 2: This signal is connected to the 32.768 kHz crystal. If
no external crystal is used, then RTCX2 should be left floating.
AC_PRESENT (Mobile Only) / GPIO14: AC_Present is an anput
signal from the platform Embedded Controller (EC) to the
Management Engine (ME). The AC_Present signal is used by the EC
to indicate to the ME the current power source of the system. When
the signal is high, this indicates to the ME that the system is
connected to an external AC sources. When the signal is low, this
indicates to the ME that the system is connected to a DC (battery)
source. The ME uses this information in conjunction with the current
system power state to determine what ME power state to run in
(M0, M1, or MOff). (Active High, Level).
This signal can instead be used as a GPIO. This signal is used as
GPIO14 in desktop systems.
Wake On LAN Power Enable: In an Intel
enabled system, this output signal is driven high by the ICH8 to
control the LAN subsystem power (VccLAN3_3, VccCL3_3, LAN PHY
Power, and SPI device) to support Wake on LAN (WOL) when the
Intel
configured and controlled by the Manageability Engine prior to
entering the powered off state.
NOTES:
1.
2.
If Intel AMT or integrated ASF are disabled on a board that is
configured for WOL_EN support, BIOS must use GPIO9 to control
power to the LAN subsystem when entering S3–S5.
In platforms that do not support Intel AMT or integrated ASF, this
signal is used as GPIO9.
®
Manageability Engine is powered off. This functionality is
This signal should be OR’d with the SLP_M# signal on the
motherboard to determine when to power the LAN
subsystem.
To support WOL out of a G3 state, the WOL_EN pin needs to
be pulled high by an external resistor until the Manageability
Engine is initialized.
Description
Description
®
Intel
AMT or integrated ASF
®
ICH8 Family Datasheet
Signal Description