Mitsubishi | HU430 | User Guide HU430 (Hurricane) NLX Motherboard

User Guide HU430 (Hurricane) NLX Motherboard
User Guide
HU430 (Hurricane) NLX Motherboard
124575UG Revision 2
13-3-98
This document is the exclusive property of Mitsubishi Electric PC Division. It shall not be copied nor it's contents
communicated or reproduced in any form and for any purpose without specific authority in writing from Mitsubishi
Electric PC Division.
HU430 NLX Motherboard User Guide
124575UG Revision 2
Contents
1
OVERVIEW ...................................................................................................................................3
1.1 MOTHERBOARD FEATURES...........................................................................................................3
1.2 CONFIGURATION OPTIONS ............................................................................................................4
1.2.1 Build-time............................................................................................................................4
1.2.2 User Configurable...............................................................................................................4
1.3 BLOCK DIAGRAM .........................................................................................................................5
2
ELECTRONICS.............................................................................................................................6
2.1 PROCESSOR ..................................................................................................................................6
2.2 CORE LOGIC .................................................................................................................................6
2.3 LEVEL 2 CACHE............................................................................................................................7
2.4 MEMORY ......................................................................................................................................7
2.4.1 Main Memory......................................................................................................................7
2.4.2 BIOS....................................................................................................................................7
2.5 VIDEO ...........................................................................................................................................7
2.6 AUDIO ..........................................................................................................................................8
2.7 STANDARD I/O .............................................................................................................................8
2.7.1 Keyboard and Mouse ..........................................................................................................9
2.7.2 Floppy Disk Interface..........................................................................................................9
2.7.3 Serial Ports .........................................................................................................................9
2.7.4 Parallel Port .......................................................................................................................9
2.8 ADDITIONAL I/O...........................................................................................................................9
2.8.1 IDE Disk Controller............................................................................................................9
2.8.2 Universal Serial Bus (USB) ..............................................................................................10
2.8.3 System Management Bus (SMBus)....................................................................................10
2.9 MOTHERBOARD POWER..............................................................................................................10
2.9.1 Regulators .........................................................................................................................10
2.9.2 Battery...............................................................................................................................10
2.10
POWER MANAGEMENT ...........................................................................................................11
2.10.1
Global Power States .....................................................................................................11
2.10.2
Power-on Control .........................................................................................................11
2.11
EXPANSION SLOTS .................................................................................................................11
2.11.1
Industry Standard Architecture (ISA) ...........................................................................11
2.11.2
Peripheral Component Interconnect (PCI) ..................................................................12
2.12
BUS RESOURCE UTILISATION .................................................................................................12
2.12.1
ISA DMA Channels.......................................................................................................12
2.12.2
ISA Interrupts ...............................................................................................................12
2.12.3
PCI Interrupts...............................................................................................................13
2.12.4
PCI Device Selection ....................................................................................................13
2.12.5
PCI Arbitration.............................................................................................................13
3
ELECTRICAL, MECHANICAL, THERMAL.........................................................................13
3.1 POWER REQUIREMENTS ..............................................................................................................13
3.2 PCB............................................................................................................................................13
3.3 THERMAL ...................................................................................................................................14
APPENDIX A. JUMPERS AND SWITCHES....................................................................................15
APPENDIX B. CONNECTOR ASSIGNMENTS ..............................................................................17
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HU430 NLX Motherboard User Guide
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1 Overview
The HU430 motherboard is an NLX form factor socket 7 design, with a local bus speed of 60
or 66MHz. The design is based around the Intel 430TX chipset. The board was designed to be
compliant with the NLX specification 1.2 and must be used with an NLX riser that also
conforms to this specification.
1.1 Motherboard Features
Form factor
Processors
Power regulation
NLX, 9.0" wide x 10.0" long
Socket 7 - P54C, P55C, K6, 60/66MHz bus speed
Adjustable processor core voltage regulator 2.1V to 3.6V, optional
3V3 regulator for 4 o/p PSUs
Core logic
Intel 430TX with PIIX4E ISA bridge
Cache
256KB or 512KB on-board L2
Memory – RAM
2 DIMMs for 64-bit unbuffered SDRAM (or EDO)
Memory - Flash ROM 2Mb: BIOS/Setup, USB, DMI, 120FD
Buses
3 bus master PCI slots and ISA
VGA
ATI VT3 (VT-B) part standard, 3D-RAGE II+ compatible, 1MB
40ns EDO upgradeable to 2MB
Audio – controller
Business audio only, Crystal CS4236B
Audio – features
MIDI/joystick header
Audio – output
Mono internal speaker, ‘PHONES OUT, MIC IN jacks on
motherboard rear panel
Hard Disk & CD-ROM Dual ATA33 (UltraDMA/33)
Floppy Disk
Standard 3.5”, 5.25” & tape drives. Support for 120MB via IDE
Parallel Port
IEEE 1284 (ECP & standard)
Serial Ports
2x 16550s: 9-way ‘D’ COM1, COM2
USB
Dual USB connector; optionally one channel can be routed to the
NLX riser
Keyboard & Mouse
Dual-stacked PS/2 style keyboard/mouse connectors
Security
BIOS branding
IR I/O
IR routed to NLX riser, but not IRDA control signals
Power Management
Uses SMM. IRQ wake-up. Magic Packet & PCI PME# supported
Cooling
NLX fan signal and CPU fan switched by GPIO port in standby,
CPU fansink connector on motheboard
System Management
DMI instrumentation chip LM78 as optional fit
Plug & Play
PC97 compliant
Battery back-up
On-board lithium coin cell with 5 years life
PCB
9.0" wide by 10.0" long, all top-side components
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1.2 Configuration Options
1.2.1 Build-time
L2 cache can be 256KB or 512KB (using 32Kx32 or 64Kx32 parts)
L2 cache can be PBSRAM or MDRAM technology
Flash BIOS ROM can be 2Mb or 4Mb TSOP40
Video controller can be VT3 (VT-B) or 3D-RAGE II+
Video memory (EDO) can be 2MB (4 pieces) soldered down or 1MB (2 pieces) soldered +
2 upgrade sockets
LM78 instrumentation amp populated or de-populated
Audio populated or de-populated
1.2.2 User Configurable
Processor support set by jumpers
Flash BIOS boot block can be unprotected by a jumper (optional fit)
Re-programming of Flash BIOS ROM can be disabled by a jumper (optional fit)
Recovery code can be forced to run by a jumper (optional fit)
Main jumper block - processor bus speed, core multiplier, processor core voltage,
enable/disable video, enable/disable audio
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1.3 Block Diagram
CPU
SOCKET 7
CACHE 0,1
TAG
64K X 32
SRAM 32K X 8
IC7, 11
IC5
SYSTEM CLOCKS
ICS9147-03
IC4
VIDEO RAM 0,1,2,3
IC13
DRAM_256K16
SYSTEM CONTROLLER
MEM_D (63:0)
MEM BANK 0,1
MEM_MA (11:0)
430TX MTXC
IC9
VID_PIXEL (7:0)
VIDEO DISPLAY CONTR.
SDRAM DIMM
ATI 264VT3
MEM_CAS# (7:0)
MM1,MM2
MEM_RAS# (3:0)
CONN.
VFC/AMC
PL12
CONTR.
CONN.
VGA
PL3
RGB,SYNC.
IC10
PCI BUS
IC23
SYSTEM MONITOR
LM78
IO_DDS (15:0)
CONN.
SECONDARY IDE
(NLX RISER)
CONTR.
DUAL USB
PL15
IC24
ISA BUS
I/O CONNECTORS
SMC FD37C67X
IC16
SERIAL PORT2
PL7
FLOPPY DRIVES
(NLX RISER)
PARALLEL PORT
PL3
XBUS_XD (7:0)
MICROPHONE
PL20
MOUSE
PL9
SERIAL PORT1
PL3
FLASH BIOS
2Mb
IC15
LM358, IC27
KEYBOARD
PL9
SUPER IO
IO_LID#,
fan_speed,
power_lines
ISA_SA (19:0)
PIIX4E
CONN.
PRIMARY IDE
(NLX RISER)
CONTR.
AUDIO SYSTEM CONTR.
EEPROM
24C16
IC22
CD IN
PL24 (OR NLX)
CS4236B
HEADPHONE
PL17
IC28
INT.SPEAKER
(NLX RISER)
LM4880, IC25
BUFFER
ISA_SD (15:0)
IO_DDP (15:0)
PCI - ISA BRIDGE (+RTC)
NLX RISER CONNECTOR
P_A(31:3)
K_TA(7:0)
CONTROL
VID_MD (63:0)
CONTROL
P_D(63:0)
VID_MA (9:0)
IC26,29,32,34
2 Electronics
2.1 Processor
Processor support is for a dual voltage-plane socket 7, for the P54C, P55C and K6. Processor
bus speeds allowed are 60 or 66MHz, and all core multipliers can be set from the main jumper
block PL10. Depending on the processor fitted, the processor bus speed, core multiplier, and
core voltage will have to be correctly set.
2.2 Core Logic
This is the Intel 430TX Pentium PCI chipset which comprises the MTXC North Bridge and
the PIIX4E South Bridge, both in BGA packages:
Board Build
Rev A to D
MTXC
Part
Step
A1
Rev D
Rev A to D
MTXC
PIIX4
A2
B0
Top Marking
FW82439TX Q536ES (sample)
FW82439TX Q537ES (sample)
FW82439TX SL238 (prodn.)
FW82439TX SL28T (prodn.)
FW82371AB Q534ES (sample)
FW82371AB Q535ES (sample)
FW82371AB SL23P (prodn.)
MTXC North Bridge features
64-bit processor host interface, Pentium family at 60MHz and 66MHz
64-bit DRAM controller, 4MB to 256MB main memory, EDO or SDRAM
L2 cache controller, 256KB or 512KB direct-mapped write-back, caches first 64MB main
memory, PBSRAM or DRAM cache
Synchronous 30MHz/33MHz 32-bit PCI 2.1 bus controller
Data path and buffers, three sets of data buffers
Power management features
PIIX4E South Bridge features
PCI 2.1 interface at 30 & 33MHz
ISA bus controller
Extensive power management features including ACPI compliance
IDE controller, two ports four drives, PIO mode 4 and Ultra 33 synchronous DMA mode
Enhanced DMA controllers, with distributed DMA support
Interrupt controllers, with serial interrupt support
System timers
Dual USB 1.0 port controller, 1.5/12 Mbps
SMBus interface
MC146818A compatible real-time clock with 256 bytes of RAM
HU430 NLX Motherboard User Guide
124575UG Revision 2
2.3 Level 2 Cache
L2 cache controller is a direct-mapped write-back design. Only the first 64MB of main
memory can be cached. It supports standard PBSRAM (15ns cycle time, 8ns clock to output)
or DRAM-based cache
HU430 supports a 256KB cache size (with 2 pcs of 32K x 32) or a 512KB cache size (with 2
pcs of 64K x 32). Optional fit resistors set the appropriate register configuration bits in the
MTXC at power-on. The cache size and type is a build option.
2.4 Memory
2.4.1 Main Memory
There are two DIMM sockets on board. Each socket is 64-bits wide and can accept EDO or
SDRAM modules. These must be unbuffered types and parity/ECC is not supported. 4Mb,
16Mb and 64Mb EDO DRAM types and 16Mb and 64Mb SDRAM types are supported.
Maximum memory per DIMM is 128MB with a maximum motherboard capacity of 256MB.
When populating memory DIMMs, either socket MM1 or MM2 may be used. In a singleDIMM system it will be easier to fit it into MM1 as another DIMM may be added to MM2 in
the future without having to unplug the module in MM1.
2.4.2 BIOS
There is a single TSOP-40 geometry on the motherboard for the Flash EPROM. This is
suitable for 1Mb, 2Mb or 4Mb parts with 5V or 12V programming voltages.
An optional enable/disable jumper, when placed in the disable position, blocks write cycles to
the Flash. This means that commands and data cannot be written to the device. The boards
will normally be shipped with the jumper absent, and the Flash set in the 'program enable'
position.
The optional 'force recover' jumper sets a bit in a GPI port in the PIIX4 and is read by the
BIOS. This is used to force a recovery situation such that data is read from the recovery disk
in the floppy disk drive. Normally, this jumper is not fitted as a recovery situation is autodetected by the BIOS.
The optional 'unlock boot jumper' enables the boot block to be temporarily unlocked for reprogramming.
HU430 has been designed so that the TSOP part can be programmed during ICT.
2.5 Video
Video controller support:
ATI VT-B (“VT3”) for standard builds
ATI 3D-Rage II+, optional build
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The video memory comprises 4 pieces of 256Kx16 40-pin SOJ to give a maximum of 2MB
(64-bits wide). Board builds populated with only 1MB (2 pieces) will have two sockets fitted
to enable the memory to be upgraded to 2MB. The memory type is 40ns EDO DRAM.
An AMC (ATI Media Connector) is also fitted; this is a 40-pin (extended) version of the 26way VESA feature connector.
2.6 Audio
The audio system is based on the Crystal CS4236B. It is a single chip audio controller
compatible with Sound Blaster, Sound Blaster Pro and the Windows Sound System.
Audio features:
Plug-and-Play ISA bus interface
16-bit address decode support
Internal FM Synthesis Support
Dual DMA Support w/FIFOs, full duplex operation
Programmable Power Management
Joystick Port and MPU-401 compatible MIDI interface
6 channel Input Mixer.
The audio circuit’s output stage is a National Semiconductor LM4880 stereo power amplifier
(Boomer family). It drives a single mono internal speaker or a stereo headphone output jack.
The amplifier will produce 600 mW RMS for the internal speaker and approximately 65 mW
RMS per channel for stereo headphones (32 impedance). The stereo headphone output is
derived from the stereo output mixer of the audio controller and the internal speaker's signal
is derived from the audio controller's separate mono output stage. In the Windows mixer
panel, it is necessary to un-mute the 'PC Speaker' output as this controls the audio controller's
mono output.
A microphone input jack is provided with phantom power for electret condenser
microphones. An optional CD-ROM audio connector is provided for connecting the internal
CD-ROM drive's audio output into the motherboard sound system.
There is a 16-way header which provides the MIDI and joystick functionality via an optionalfit 15-way D-type cable assembly.
The audio section can be completely de-populated, leaving the conventional PC-Beep. The
PC beep is always available from the small PCB-mounted speaker if the enable jumper is
present. The output of the audio sub-system is never fed to the PCB-mounted speaker.
If the audio sub-system is not fitted, then the PC beep signal is fed up the NLX riser on the
left channel. If the audio sub-system is fitted then the mono speaker output is fed up the NLX
riser on the left channel.
2.7 Standard I/O
The SMC FDC37C675 combo controller provides standard I/O. This comprises the four
functional blocks below. It is packaged in a 100-pin QFP and is fully PC97 and motherboard
Plug-and-Play compliant. It supports three ISA DMA channels and supports a serial interrupt
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scheme compatible with that of the PIIX4. This allows a wide selection of interrupt channels
for the serial and parallel ports, and the floppy disk controller.
2.7.1 Keyboard and Mouse
This is implemented in an SMC 37C675 device on the motherboard. The keyboard and mouse
controller uses the Phoenix Multikey version 1.40 firmware. PS/2 style keyboard and mouse
ports are provided on the rear panel. This version does not support keyboard/mouse port
swapping.
2.7.2 Floppy Disk Interface
This is implemented in an SMC 37C675 device on the motherboard. Standard 2-mode and 3mode 3½” drives are supported. The 3-mode drive includes the 1.6MB (unformatted) mode
that is popular in Japan; this requires a special OS device driver that installs the 1.6MB mode
floppy disk drive as another system device.
The floppy disk drive signals are routed from the motherboard to the NLX riser and the
floppy disk drive connector is mounted on the NLX riser.
As per the NLX specification, all floppy disk input signals to the motherboard must be pulled
up on the NLX riser.
2.7.3 Serial Ports
This is implemented in an SMC 37C675 device on the motherboard. There are two standard
COM ports which are wired to two standard 9-way D-type connectors on the rear panel. The
maximum Baud rate is 115K bits per second.
2.7.4 Parallel Port
This is implemented in an SMC 37C675 device on the motherboard. This is EPP 1.7/1.9 and
IEE1284 (ECP) compliant and is compatible with a standard (output only) PC parallel port as
well as a bi-directional (PS/2 style) parallel port. There is a 25-way D-type connector on the
rear panel.
2.8 Additional I/O
2.8.1 IDE Disk Controller
This is integrated into the PIIX4E South Bridge device. Two connectors are provided on the
NLX riser allowing two drives per cable. The system BIOS auto-detects the drives fitted and
sets the best signal timing appropriate for the drives. PIIX4E supports up to PIO mode 4
timing and bus master IDE transfers up to 33MBps (ATA33). The total cable length attached
to each connector must not exceed 12" or signal integrity problems may result.
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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 I2C. It comprises a bus master
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
The video controller I2C bus is local to the video controller, AMC connector, and VGA
connector.
2.9 Motherboard Power
2.9.1 Regulators
The board has a switched-mode regulator and optionally, a linear regulator. The switchedmode 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.
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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
(G3)
SOFT-OFF (G2)
SLEEPING
(G1/S1)
WORKING (G0)
AC input
CPU
disconnected
PSU main
o/p rails
off
off
Green
anode
off
Red
anode
off
F/P
LED
off
connected
off
off
off
connected
on
on
connected
on
on: clock
stopped
full speed or
clock
throttling
on or off
(build)
on or off
(s/w)
on or off
(s/w)
red or
off
orange
or green
orange
or green
on
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
High
Action
machine powers-up in SOFT-OFF and waits for a power button press
before going into WORKING state
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)
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The PIIX4E can support up to 5 ISA slots on the riser. There are an additional two ISA
‘loads’ used on the motherboard: the audio and super i/o controllers.
2.11.2 Peripheral Component Interconnect (PCI)
The motherboard can support up to 3 bus master PCI slots on the NLX riser.
2.12 Bus Resource Utilisation
2.12.1 ISA DMA Channels
DMA
Data
Width
8-bit
8-bit
8-bit
8-bit
16-bit
16-bit
16-bit
Usual Assignment
Audio
Combo
0
option
Audio (8-bit)
1
option
option
Floppy disk controller
2
option
ECP
parallel
port
3
option
option
DMAC daisy chain
4
5
6
7
Shaded areas indicate DMA channels not normally available on the ISA bus
2.12.2 ISA Interrupts
IRQ
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Usual Assignment
Timer 0
Keyboard
PIC daisy chain
Serial port 2
Serial port 1
Audio
Floppy disk controller
Parallel port
Real-time clock
Video
Audio
Combo
option
option
option
option
option
option
option
option
option
option
option
option
option
option
option
Mouse
option
option
Co-processor
option
Primary IDE
option
Secondary IDE
option
option
Shaded areas indicate IRQs not normally available on the ISA bus
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2.12.3 PCI Interrupts
Channel
INTA#
INTB#
INTC#
INTD#
Device
Slots
Slots
Slots
Video & slots
2.12.4 PCI Device Selection
Dev No IDSEL
Device
Function No Function
0
AD(11)
MTXC
4
AD(15)
VGA
7
AD(18)
PIIX4E
0
PCI-ISA bridge
“
“
“
1
IDE interface
“
“
“
2
USB interface
“
“
“
3
Power management
16
AD(27)
Slot 3
18
AD(29)
Slot 2
20
AD(31)
Slot 1
Slot resource depends on NLX riser conforming to NLX specification
2.12.5 PCI Arbitration
Channel
PHOLD#
0
1
2
3
Device
PIIX4E
VGA
Slot 1
Slot 2
Slot 3
3 Electrical, Mechanical, Thermal
3.1 Power Requirements
TBD
3.2 PCB
The PCB is a four-layer design measuring W9.0” x L10.0”. It is designed to be NLX
compatible. The following table shows a size comparison with current MEPCD
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motherboards. The 'width' dimension is the edge adjacent to the system rear panel which
contains the I/O connectors:
Standard LPX
Spitfire
HU430
Length
13.0”
7.6”
10.0"
Width
9.0”
9.0”
9.0"
Comments
Small LPX
Small NLX
3.3 Thermal
The processor site needs to dissipate up to 28.3W. This will accommodate the 233MHz
0.35µm (3.2V) version of K6. The case temperature of Pentium, Pentium MMX or K6
processors must not exceed 70ºC.
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Appendix A.
124575UG Revision 2
Jumpers And Switches
Main Jumper Block, PL10
BF1 and BF0 set the processor bus/core multiplier ratio on P54C and P55C processors, and
BF2 is present to support the K6. The FS jumper selects a processor bus speed of 60 or 66
MHz.
The VGA jumper enables/disables the on-board VGA controller as follows:
VGA = IN
VGA = OUT
Enable on-board VGA controller
Disable on-board VGA
controller
The AUDIO jumper enables/disables the on-board audio (if fitted) as follows:
AUD = IN
AUD = OUT
Enable on-board audio
Disable on-board audio
Note that the BIOS auto-detects a video card plugged into an expansion slot and disables the
on-board video. The VGA jumper provided disables the on-board VGA controller in
hardware in case there is a problem with the auto-disable function.
The PW3-0 jumpers select the value of the processor core voltage. This is necessary as P54C,
P55C and K6 processors require different core voltages. The board cannot automatically
detect the core voltage that is required by the processor and so this must be set manually.
The table below shows supported CPUs with their configuration jumper settings; note that the
presence of any processor type or speed in the table does not imply that it is or will be
available:
CPU
P54C
P54C
P54C
P54C
P54C
P54C
P55C
K6
P54C
P55C
K6
P55C
K6 0.35µm
K6 0.25µm
K6 0.25µm
K6 0.25µm
Core/bus
speeds
90/60 MHz
100/66 MHz
120/60 MHz
133/66 MHz
150/60 MHz
166/66 MHz
166/66 MHz
166/66 MHz
200/66 MHz
200/66 MHz
200/66 MHz
233/66 MHz
233/66 MHz
233/66 MHz
266/66 MHz
300/66 MHz
Ratio
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3/2
3/2
2/1
2/1
5/2
5/2
5/2
5/2
3/1
3/1
3/1
7/2
7/2
7/2
4/1
9/2
PCI/ISA bus
speeds
30/7.5 MHz
33/8.33 MHz
30/7.5 MHz
33/8.33 MHz
30/7.5 MHz
33/8.33 MHz
33/8.33 MHz
33/8.33 MHz
33/8.33 MHz
33/8.33 MHz
33/8.33 MHz
33/8.33 MHz
33/8.33 MHz
33/8.33 MHz
33/8.33 MHz
33/8.33 MHz
BF2
BF1
BF0
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
1
1
0
0
FS
Pw2
Pw1
Pw0
Pw3
IN
IN
IN
OUT IN
IN
IN
IN
IN
OUT IN
IN
IN
IN
IN
OUT IN
IN
OUT OUT OUT
OUT IN
OUT
OUT IN
IN
OUT OUT OUT
OUT IN
OUT
OUT OUT OUT
OUT IN
OUT
OUT OUT IN
OUT OUT IN
OUT OUT IN
IN
IN
IN
IN
IN
IN
OUT
OUT
IN
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
OUT
OUT
OUT
Cor
V
3.5
3.5
3.5
3.5
3.5
3.5
2.8
3.2
3.5
2.8
3.2
2.8
3.2
2.2
2.2
2.2
Page 15 of 21
HU430 NLX Motherboard User Guide
=1
BF1
=0
124575UG Revision 2
=1
=1
BF0
BF1
=0
=0
BF2
FS (IN=60MHz, OUT=66MHz)
VGA (IN=enable)
AUDIO (IN=enable)
PW2
PW1
PW0
PW3
PL10 - Configuration
=1
BF0
=0
BF2
FS
VGA
AUDIO
PW2
PW1
PW0
PW3
Example - 233MHz P55C
MMX Power Jumper PL5
Note that these two jumpers must be fitted for a Pentium MMX or K6 processor to function
correctly.
Position
1-2, 3-4
No fit
Function
P55C MMX or K6
P54C Pentium
Battery Jumper, PL19
Position
1-2
2-3
Function
Normal operation
Clear RTC CMOS RAM
Enable On-board Speaker, PL13
Position
IN
OUT
Mitsubishi Electric PC Division
Function
Enable on-board speaker
Disable
Page 16 of 21
HU430 NLX Motherboard User Guide
Appendix B.
124575UG Revision 2
Connector Assignments
NLX Riser Edge Connector
TBA
NLX Supplemental Edge Connector
TBA
USB, PL15
1
4
USB
Port 0
USB
Port 1
1
4
1
2
3
4
+5V
DATADATA+
GND
The +5V supply to both connectors is fused with a single 1.1A resettable fuse.
AMC, PL12
Digital ground
Digital ground
Digital ground
EVIDEO/IOW
#
ESYNC/IOR#
EDCLK/RDY
NC/SAD4/SD
A
Digital ground
Digital ground
Digital ground
VFSENSE#
NC/SCL
Key pin
Key pin
1
3
5
7
2
4
6
8
P0
P1
P2
P3
9
11
13
10
12
14
P4
P5
P6
15
17
19
16
18
20
21
23
25
27
22
24
26
28
P7
DCLK
BLANK#/SA
D0
HSYNC/SAD1
VSYNC/SAD2
Digital ground
Key pin
Mitsubishi Electric PC Division
Page 17 of 21
HU430 NLX Motherboard User Guide
+5V
RESET#
SAD6
RES/SDA
Analogue gnd
AUDRIGHT
29
31
33
35
37
39
30
32
34
36
38
40
124575UG Revision 2
SAD3
SAD7
SAD5
REV
+12V
AUDLEFT
VGA, PL3
5
1
6
10
15
11
1
GND
+5V
B RTN
G RTN
R RTN
6
GND
NC
BLUE
GREEN
RED
VSYNC
HSYNC
SDA
NC
SCL
11
The +5V supply is fused with a 1.1A resettable fuse.
Keyboard & Mouse, PL9
1
2
3
4
5
6
CLK
+5V
GND
No connect
DATA
No connect
Parallel Port, PL3
13
25
Mitsubishi Electric PC Division
1
14
Page 18 of 21
HU430 NLX Motherboard User Guide
124575UG Revision 2
1
STROBE#
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
ACK#
BUSY
PE
SLCT
14
ALF#
ERROR#
INIT#
SLCTIN#
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground
COM1, PL3 And COM2, PL7
1
2
3
4
5
6
7
8
9
1
5
6
9
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI
Input
Input
Output
Output
Ground
Input
Output
Input
Input
Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Ground reference pin
Data Set Ready
Ready To Send
Clear To Send
Ring Indicate
MIDI & Joystick Header, PL18
The +5V supply to this connector is fused with a 1.1A resettable fuse.
Mitsubishi Electric PC Division
Page 19 of 21
HU430 NLX Motherboard User Guide
+5V
J/stick A fire 1
J/stick A x-ctrl
GND
GND
J/stick A y-ctrl
J/stick A fire 2
+5V
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
124575UG Revision 2
+5V
J/stick B fire 1
J/stick B x-ctrl
MIDI out
J/stick B y-ctrl
J/stick B fire 2
MIDI in
Key pin
CPU Fan, PL16
The fan output is fused with a 0.75A resettable fuse. The maximum continuous current that
can be supplied by the motherboard is 150mA.
1
2
3
Ground
+12V switched
Ground
Microphone In, PL20
Shld
Ring
Tip
Frame GND
Bias
Signal input
Headphones Out, PL17
Shld
Ring
Tip
Frame GND
Right output
Left output
CD Audio, PL24
This connector is not always fitted to the motherboard.
1
2
3
4
Reference
Left in
Reference
Right in
Reset, PL14
This connector is not always fitted to the motherboard.
Mitsubishi Electric PC Division
Page 20 of 21
HU430 NLX Motherboard User Guide
124575UG Revision 2
To cause a reset event to occur, pin 1 must be shorted to ground.
1
2
Input
Ground
Mitsubishi Electric PC Division
Page 21 of 21
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