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HU430 NLX Motherboard User Guide
2.10 Power Management
2.10.1 Global Power States
The ACPI global power states are summarised in the table below. The last three columns
indicate the colour of a tri-colour LED when the red anode is connected to the 'power LED'
signal from the NLX connector. The 'power LED' signal is controlled by the motherboard.
System power
state
MECH. OFF
disconnected
(G3)
SOFT-OFF (G2)
SLEEPING
(G1/S1)
WORKING (G0)
2.10.2 Power-on Control
On HU430 a GPO port is used to control the state after an AC reconnect, regardless of how
the machine was powered off:
GPO27
Low
machine powers-up in SOFT-OFF and waits for a power button press
before going into WORKING state
High
machine powers straight into WORKING state
The GPO port bit is set by the BIOS during each power-on sequence to determine the action
to be taken on the next AC reconnect. This setting is retained by a battery-backed latch. If the
battery is replaced then the board always waits for a power button press before going into the
WORKING state; thereafter the board powers-up immediately upon AC reconnect unless the
BIOS sets the GPO low.
2.11 Expansion Slots
The ISA and PCI expansion slots are located on the riser card. The ISA and PCI signals are
routed through an edge connector on one edge of the board which mates with the NLX riser.
As per the NLX specification, the motherboard requires that the PCI signals are correctly
terminated and pulled up on the NLX riser for the motherboard to operate properly.
2.11.1 Industry Standard Architecture (ISA)
Mitsubishi Electric PC Division
AC input
PSU main
o/p rails
off
connected
off
connected
on
connected
on
CPU
Green
anode
off
off
off
off
on: clock
on
stopped
full speed or
on
clock
throttling
Action
124575UG Revision 2
Red
F/P
anode
LED
off
off
on or off
red or
(build)
off
on or off
orange
(s/w)
or green
on or off
orange
(s/w)
or green
Page 11 of 21
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