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HU430 NLX Motherboard User Guide
2.8.2 Universal Serial Bus (USB)
The controller is integrated into the PIIX4E. Two channels are wired to a dual-stacked USB
connector provided on the rear panel. Optionally, the motherboard may have a single USB
connector on the rear panel with one channel routed to the NLX riser.
2.8.3 System Management Bus (SMBus)
This is a two-wire bi-directional serial bus compatible with I
controller for interrogating other devices, and a slave controller enabling it to act as a slave to
other bus masters. Devices that are connected to this bus are:
main memory DIMMs
2
The video controller I
connector.
2.9 Motherboard Power
2.9.1 Regulators
The board has a switched-mode regulator and optionally, a linear regulator. The switched-
mode regulator provides the power for the processor core, and also powers the processor I/O
in the case of a non-MMX Pentium. The 3V3 power for the rest of the motherboard is
supplied either by an optional-fit on-board linear regulator or by the NLX power supply fed
via the NLX riser.
Warnings: if the optional-fit linear regulator is fitted on the motherboard then the user must
ensure that:
3V3 is not supplied to the motherboard from an NLX PSU via the NLX riser
No peripheral or card on the riser uses the motherboard-generated 3V3
As the switched-mode regulator always supplies the CPU core, the voltage is selectable on the
main jumper block to cater for different processor core voltages (the motherboard cannot
detect this automatically).
2.9.2 Battery
An IEC-type CR2032 3V lithium coin cell and holder are fitted to the board. Cell capacities in
the range 170mAh to 210mAh are acceptable. This cell typically provides battery backup of
the RTC for five years. The battery can be replaced by the user - the clip needs to be prised
back with a small screwdriver and the battery is lifted up by spring pressure.
Mitsubishi Electric PC Division
C bus is local to the video controller, AMC connector, and VGA
124575UG Revision 2
2
C. It comprises a bus master
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