MB839-1C
MB839-4C
USER’S MANUAL
Version A1
Acknowledgments
Award is a registered trademark of Award Software International,
Inc.
PS/2 is a trademark of International Business Machines
Corporation.
Intel® and Atom™ and Celeron® are registered trademark of
Award Software International, Inc. registered trademark and
trademark of Intel Corporation.
Microsoft Windows is a registered trademark of Microsoft
Corporation.
Winbond is a registered trademark of Winbond Electronics
Corporation.
All other product names or trademarks are properties of their
respective owners.
ii
MB839 series User’s Manual
Table of Contents
Introduction .............................................................. 1
Product Description............................................................. 1
Checklist .............................................................................. 2
MB839 Specifications ......................................................... 3
Board Dimensions ............................................................... 4
Installations .............................................................. 5
Installing the Memory ......................................................... 6
Setting the Jumpers and Connectors ................................... 7
Jumper & Connector Location on MB839-1C / MB839-4C 8
JP1: MicroSD Power select ................................................. 8
JP2: BIOS Flash Security Setting ........................................ 8
JP3: Clear CMOS Setting .................................................... 8
JP4: Clear ME Setting ......................................................... 9
JP5: VGA Connectors.......................................................... 9
JP6: LPC Debug Port ........................................................... 9
JP7: SPI Debug Port ............................................................ 9
J3: MCU Update (Factory use only) .................................. 11
J7: SATA Power Connector .............................................. 11
J8 : USB 2.0 Pin Header .................................................... 11
J10: AT_12V Connector .................................................... 11
FAN1: System Fan Power Connector ................................ 12
LED1, LED2, LED3, LED4: LAN Port Link, Active LED 12
LED5: Status LED ............................................................. 12
SW3: Software reset button ............................................... 12
CN1: MicroSD Connector ................................................. 13
CN2: Console Port (COM1) .............................................. 13
CN3: Serial ATA Port ....................................................... 13
CN4: USB2.0 Ports ........................................................... 13
CN5, CN6, CN7, CN8: LAN 1G / 100M Port ................... 13
CN9: SO-DIMM DDR3 Socket ......................................... 13
CN10: Compact Flash Connector ...................................... 13
CN11: Mini PCI- E Connector (Half size)......................... 13
CN12 : DC Power Jack (+12V only) ................................. 13
BIOS Setup ............................................................. 14
BIOS Introduction ............................................................. 15
BIOS Setup ........................................................................ 15
Advanced Settings ............................................................. 17
MB839 series User’s Manu iii
Chipset Settings.................................................................. 23
Security Settings ................................................................ 24
Save & Exit Settings .......................................................... 25
Drivers Installation ................................................. 27
Intel Chipset Software Installation Utility ........................ 28
VGA Drivers Installation .................................................. 29
LAN Drivers Installation ................................................... 31
Appendix ................................................................. 33
A. I/O Port Address Map .................................................. 33
B. Interrupt Request Lines (IRQ) ...................................... 34
C. Watchdog Timer Configuration ................................... 35
D. Digital I/O Sample Code .............................................. 40
E. Register of the LAN Bypass Controller........................ 45
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MB839 Series User’s Manual
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MB839 series User’s Manu v
INTRODUCTION
Introduction
Product Description
The MB839 is a small footprint single board computer that is configured
with the Intel Celeron® J1900 or AtomTM E3815 SoC.
This 5.25-inch SBC provides greater flexibility for developers of
embedded computing solutions. It is ideally suited for rugged and
compact designs as in Internet devices and applications in automation,
industrial control, data acquisition, thin client and other embedded PC
applications.
One DDR3 SO-DIMM on board implements up to 8GB of system
memory. Four Gigabit LAN ports are also available.
Advanced connectivity and expansion interfaces are provided by one CF
socket, one SATA-III, one Mini PCI-e and two USB 2.0 ports.
MB839-4C Features
Intel Celeron® J1900 at 2.0GHz processor
Four Intel® Gigabit LAN ports
DDR3L SO-DIMM x1, up to 8GB
Mini PCI-E half size slot x1
Compact Flash socket
LAN Bypass Enable/Disable pre-setting by BIOS on Eth 3 & 4
MB839-1C Features
Intel AtomTM E3815 at 1.46GHz processor
Four Intel® Gigabit LAN ports
DDR3L SO-DIMM x1, up to 8GB
Mini PCI-E half size slot x1
Compact Flash socket
LAN Bypass Enable/Disable pre-setting by BIOS on Eth 3 & 4
MB839 Series User’s Manual 1
INSTALLATIONS
Checklist
Your MB839 package should include the items listed below.
The MB839-1C or MB839-4C embedded board
Drivers DVD containing chipset drivers and flash memory utility
Cables are optional.
2
MB839 Series User’s Manual
Product Name
MB839-1C or MB839-4C
Form Factor
5.25” Disk Size SBC
CPU Type
Operating Frequency
Intel “Bay Trail” Processor, 22nm Bulk
MB839-4C: Celeron J1900 = 2.0 GHz [TDP= 10W], Quad Core
MB839-1C: Atom E3815 = 1.46 GHz [TDP= 5W], Single Core
BIOS
AMI BIOS w/ACPI
Ethernet controller
Intel I211-AT PCI Express Gigabit ethernet controller x4
Memory
CPU on-die memory controller supporting up to 8GB
One DDR3L SO-DIMM socket, Non-ECC, unbuffered
LAN
Console: RS-232 @ RJ45
Eth1, 2, 3 & 4: Intel I211-AT @ RJ45 with LED
Network Bypass
One segment hardware Bypass (Eth3 & 4)
Control by GPIO / Watchdog
Watchdog Timer
Yes (256 segments, 0, 1, 2…255 sec/min)
Storage
Onboard CF Socket x1
7-pin SATA connector for 2.5” HDD x1 (optional HDD kit)
Rear Panel
Cylindrical (Tip) Connector DC +12V inlet with Screw Lock
Power On / Off Switch
Optional opening for Wireless LAN antenna
RJ45 x1 for Console
RJ45 with LED x4 for GLAN
USB 2.0 x2
Front Panel
LED: Power (Green) / Alarm (Red) / Status (Yellow)
LAN Speed LED (Yellow / Green) x4
LAN Link / Act LED (Green) x4
Factory Mode Restore Reset Switch (GPIO control)
USB 2.0
USB 2.0 x4
External x2
[2x4] Pin header Onboard x1
Mini PCI-e Socket x1
Video
VGA pin header onboard x1
LPC I/O
Nuvoton NCT5523D:
RS-232 [2x5] Pin Header Onboard x1
RJ45 Console x1
Hardware monitors
Fan Connector x1
Internal I/O Headers
4-pin Smart Fan Connector x1
2-pin header for DC-in (12V) x1
Keyboard + Mouse ([1x6] Pin Header) x1
Expansion Interface
Mini PCI Socket x1
Mini PCI-e Socket x1 (USB Signal Only)
Power Supply
Full range 40W Adapter / 12V (Optional)
Dimensions
203(W) x 149.5(D) mm
Operation
Temperature
0 ~ 60 ˚C (32 ~ 140 ˚F)
Storage Temperature
-20 ~ 80 ˚C (-4 ~ 176 ˚F)
MB839 Specifications
INTRODUCTION
MB839 Series User’s Manual 3
INSTALLATIONS
[
Board Dimensions
unit: mm
4
MB839 Series User’s Manual
INSTALLATIONS
Installations
This section provides information on how to use the jumpers and
connectors on theMB839 in order to set up a workable system. The topics
covered are:
Installing the Memory ............................................................................ 6
Setting the Jumpers and Connectors ...................................................... 7
MB839 Series User’s Manual 5
INSTALLATIONS
Installing the Memory
The MB839 board supports one DDR3 memory socket that can support
up to 8GB memory, DDR3L (w/o ECC function).
Installing and Removing Memory Modules
To install the DDR3L module, locate the memory slot on the board and
perform the following steps:
1. Hold the DDR3L module so that the key of the DDR3L module aligns
with that on the memory slot. Insert the module into the socket at a
slight angle (approximately 30 degrees). Note that the socket and
module are both keyed, which means that the module can be installed
only in one direction.
2. To seat the memory module into the socket, apply firm and even
pressure to each end of the module until you feel it slip down into the
socket.
3. With the module properly seated in the socket, rotate the module
downward. Continue pressing downward until the clips at each end
lock into position.
4. To remove the DDR3L module, press the clips with both hands.
6
MB839 Series User’s Manual
INSTALLATIONS
Setting the Jumpers and Connectors
Jumpers are used on MB839 to select various settings and features
according to your needs and applications. Contact your supplier if you
have doubts about the best configuration for your needs. The following
lists the connectors on MB839 and their respective functions.
Jumper & Connector Location on MB839-1C / MB839-4C.................. 8
JP1: MicroSD Power select ................................................................... 8
JP2: BIOS Flash Security Setting .......................................................... 8
JP3: Clear CMOS Setting ...................................................................... 8
JP4: Clear ME Setting ........................................................................... 9
JP5: VGA Connectors............................................................................ 9
JP6: LPC Debug Port ............................................................................. 9
JP7: SPI Debug Port .............................................................................. 9
JP12: System Function Connector ....................................................... 10
J3:MCU UPDATE(Factory use only) .................................................. 11
J4: Serial Port (COM2) ........................................................................ 11
J7: SATA Power Connector ................................................................ 11
J8 : USB 2.0 Pin Header ...................................................................... 11
J10: AT_12V Connector ...................................................................... 11
FAN1: System Fan Power Connector .................................................. 12
LED1, LED2, LED3, LED4: LAN Port Link, Active LED ................. 12
LED5: Status LED ............................................................................... 12
SW3: Software reset button ................................................................ . 12
CN1: MicroSD Connector ................................................................... 13
CN2: Console Port (COM1) ................................................................ 13
CN3: Serial ATA Port ......................................................................... 13
CN4: USB2.0 Ports ............................................................................. 13
CN5, CN6, CN7, CN8: LAN 1G / 100M Port ..................................... 13
CN9: SO-DIMM DDR3 Socket ........................................................... 13
CN10: Compact Flash Connector ........................................................ 13
CN11: Mini PCI- E Connector (Half size)........................................... 13
CN12 : DC Power Jack (+12V only) ................................................... 13
MB839 Series User’s Manual 7
INSTALLATIONS
Pin #
Signal Name
1
+V1.8V
2
+VSDIO_IN
3
+V3.3V
Pin #
Signal Name
1
GND
2
I2S_2_TXD
JP2
Setting
Normal
Clear CMOS
Jumper & Connector Location on MB839-1C / MB839-4C
JP1: MicroSD Power select
JP2: BIOS Flash Security Setting
JP3: Clear CMOS Setting
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MB839 Series User’s Manual
JP3
Setting
Normal
Clear ME
Signal Name
Pin #
Pin #
Signal Name
VGA_R
1 2 VGA_PWR
VGA_G
3 4 GND
VGA_B
5 6 NC
NC
7 8 VGADDCDATA
GND
9
10
HSYNC
GND
11
12
VSYNC
GND
13
14
VGADDCCLK
GND
15
Signal Name
Pin #
Pin #
Signal Name
LPC_AD0
1 2 SIO_PLTRST#
LPC_AD1
3 4 LPC_FRAME#
LPC_AD2
5 6 +3.3V
LPC_AD3
7 8 Ground
LPC_CLK
9
Signal Name
Pin #
Pin #
Signal Name
NC
1 2 NC
SPI_CS#0
3 4 +1.8V
SPI_SO
5
6
SPI0_HOLD#
SPI0_WP#
7 8 SPI_CLK
GND
9
10
SPI_SI
JP4: Clear ME Setting
JP5: VGA Connectors
JP6: LPC Debug Port
INSTALLATIONS
JP7: SPI Debug Port
MB839 Series User’s Manual 9
INSTALLATIONS
Pin #
Signal Name
1
+5V
2
GND
Pin #
Signal Name
3
Power_ON
4
GND
Pin #
Signal Name
5
+3.3V
6
-HDD_LED
Pin #
Signal Name
7
PM_SYSRST#
8
GND
JP12: System Function Connector
JP12 provides connectors for system indicators that provide light
indication of the computer activities and switches to change the computer
status. JP12 is a 8-pin header that provides interfaces for the following
functions
Pin 1,2: Power LED
The power LED indicates the status of the main power switch.
Pin 3,4: ATX Power ON Switch
Pin 3 & 4 are for “ATX Power Supply On/Off Switch” on the
system that connects to the power switch on the case. When
pressed, the power switch will force the system to power on. When
pressed again, it will force the system to power off.
10
Pin 5, 6: Hard Disk Drive LED Connector
This connector connects to the hard drive activity LED on control
panel. This LED will flash when the HDD is being accessed.
Pin 7, 8: Reset Switch
The reset switch allows the user to reset the system without turning
the main power switch off and then on again. Orientation is not
required when making a connection to this header.
MB839 Series User’s Manual
Signal Name
Pin #
Pin #
Signal Name
DCD#
1 6 DSR#
SIN
2 7 RTS#
SOUT
3 8 CTS#
DTR#
4 9 RI#
GND
5
Pin #
Signal Name
1
+5V
2
Ground
3
Ground
4
+12V
Signal Name
Pin #
Pin #
Signal Name
NC
1 2 GND
NC
3 4 D+
NC
5 6 D-
GND
7 8 +5V
Pin #
Signal Name
1
+12V
2
Ground
J3: MCU Update (Factory use only)
J4: Serial Port (COM2)
J7: SATA Power Connector
J8 : USB 2.0 Pin Header
INSTALLATIONS
J10: AT_12V Connector
DC-in internal connector supports +12V.
Remarks: Do not connect CN12 and J10 at the same time.
MB839 Series User’s Manual 11
INSTALLATIONS
Pin #
Signal Name
1
Ground
2
+12V
3
Rotation Control
Signal Name
Pin #
Pin #
Signal Name
SIO_GP27
A1
C1
SIO_GP26
ALARM_R
A2
C2
BY_LED_R
PWR_R
A3
C3
GND
Signal Name
Pin #
Pin #
Signal Name
GND
1
2
Intel SoC
GPIO7
FAN1: System Fan Power Connector
Pin header for system fan. The fan must be 12V (Max. 1A).
LED1, LED2, LED3, LED4: LAN Port Link, Active LED
LED5: Status LED
A1 & C1 : Status LED
A2 & C2 : Bypass LED
A3 & C3 : Power LED
Index port: 4E
Data port: 4F
Device: 07
F5h bit5, bit6 (Control pin)
SW3: Software reset button
Note: SW3 is controlled by GPIO only.
12
IO Base:
Read memory 0 x fed0e238 and set bit 1 to “1” as (GPI ),
set bit 1 to “0” as (GPO )
Read memory 0 x fed0e238 and check the bit 0 (Control Pin)
MB839 Series User’s Manual
CN1: MicroSD Connector
Pin #
Signal Name (RS-232)
1
RTS, Request to send
2
DTR, Data terminal ready
3
TXD, Transmit data
4
Ground
5
Ground
6
RXD, Receive data
7
DSR, Data set ready
8
CTS, Clear to send
CN2: Console Port (COM1)
CN3: Serial ATA Port
CN4: USB2.0 Ports
CN5, CN6, CN7, CN8: LAN 1G / 100M Port
CN9: SO-DIMM DDR3 Socket
CN10: Compact Flash Connector
INSTALLATIONS
Note: CF card supports IDE mode only.
CN11: Mini PCI- E Connector (Half size)
CN12 : DC Power Jack (+12V only)
Note: CN12 and J10 cannot be connected at the same time.
MB839 Series User’s Manual 13
If CF card applied, please set the SATA configuration to “IDE
mode” in BIOS.
BIOS Setup
BIOS Setup
This chapter describes the different settings available in the AMI BIOS
that comes with the board. The topics covered in this chapter are as
follows:
BIOS Introduction ................................................................................ 15
BIOS Setup .......................................................................................... 15
Advanced Settings ................................................................................ 17
Chipset Settings.................................................................................... 22
Security Settings .................................................................................. 23
Boot Settings ........................................................................................ 24
Save & Exit Settings ............................................................................ 24
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MB839 Series User’s Manual
BIOS Setup
BIOS Introduction
The BIOS (Basic Input/Output System) installed in your computer
system’s ROM supports Intel processors. The BIOS provides critical
low-level support for a standard device such as disk drives, serial ports
and parallel ports. It also password protection as well as special support
for detailed fine-tuning of the chipset controlling the entire system.
BIOS Setup
The BIOS provides a Setup utility program for specifying the system
configurations and settings. The BIOS ROM of the system stores the
Setup utility. When you turn on the computer, the BIOS is immediately
activated. Pressing the <Del> key immediately allows you to enter the
Setup utility. If you are a little bit late pressing the <Del> key, POST
(Power On Self Test) will continue with its test routines, thus preventing
you from invoking the Setup. If you still wish to enter Setup, restart the
system by pressing the ”Reset” button or simultaneously pressing the
<Ctrl>, <Alt> and <Delete> keys. You can also restart by turning the
system Off and back On again. The following message will appear on the
screen:
Press <DEL> to Enter Setup
In general, you press the arrow keys to highlight items, <Enter> to select,
the <PgUp> and <PgDn> keys to change entries, <F1> for help and
<Esc> to quit.
When you enter the Setup utility, the Main Menu screen will appear on
the screen. The Main Menu allows you to select from various setup
functions and exit choices.
MB839 Series User’s Manual 15
BIOS Setup
Warning:
It is strongly recommended that you avoid making any
changes to the chipset defaults. These defaults have been
carefully chosen by both AMI and your system manufacturer
to provide the absolute maximum performance and
reliability. Changing the defaults could cause the system to
become unstable and crash in some cases.
System Date
Set the Date. Use Tab to switch between Data elements.
System Time
Set the Time. Use Tab to switch between Data elements.
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MB839 Series User’s Manual
BIOS Setup
Main Advanced Chipset Boot Security Save & Exit
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
OnBoard LAN PXE Rom
[Disabled]
► ACPI Settings
► Super IO Configuration
► H/W Monitor
► LAN Bypass Configuration
► Serial Port Console Redirection
► CPU Configuration
► PPM Configuration
► IDE Configuration
► SDIO Configuration
Main Advanced Chipset Boot Security Save & Exit
ACPI Settings
Enable ACPI Auto Configuration [Disabled]
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
Enable Hibernation
[Enabled]
ACPI Sleep State
S3 (Suspend to RAM)
Advanced Settings
This section allows you to configure and improve your system and allows
you to set up some system features according to your preference.
OnBoard LAN PXE Rom
Controls the execution of UEFI and Legacy PEX OpROM.
ACPI Settings
Aptio Setup Utility
Aptio Setup Utility
Enabled ACPI Auto Configuration
Enables or Disables BIOS ACPI Auto Configuration.
Enable Hibernation
Enables or Disables System ability to Hibernate (OS/S4 Sleep State).
This option may be not effective with some OS.
ACPI Sleep State
Select the highest ACPI sleep state the system will enter, when the
SUSPEND button is pressed.
MB839 Series User’s Manual 17
BIOS Setup
Main Advanced Chipset Boot Security Save & Exit
PC Health Status
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
Smart Fan Function
[50]
System temperature
+33 C
CPU temperature
System Fan Speed
+37 C
3600 RPM
VCORE
+0.840 V
+1.35V
+1.368 V
AVCC
+3.388 V
VSB3
+3.376V
VCC3V
VBAT
+3.388 V
+3.280 V
CPU Shutdown Temperature
[Disabled]
Super IO Configuration
Set Parameters of Serial Ports. User can Enable/Disable the serial port
and Select an optimal settings for the Super IO Device.
H/W Monitor
Aptio Setup Utility
Smart Fan Function
50 ℃
60 ℃
70 ℃
80 ℃
90 ℃
CPU Shutdown Temperature
The default setting is disabled.
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MB839 Series User’s Manual
BIOS Setup
Main Advanced Chipset Boot Security Save & Exit
LAN Bypass Configuration
Firmware Information
Signature
Version
ETH-BYPASS
2.1
Bypass Quick Setting
[Normal]
Main Advanced Chipset Boot Security Save & Exit
LAN Bypass Configuration
Bypass Quick Setting
[Custom Define]
Watchdog Reset Signal
WDT Bypass Setting
LAN3 LAN4 Bypass
[Disabled]
[Normal]
System OFF Bypass Setting
LAN3 LAN4 Bypass
[Normal]
Ethernet Bypass Configuration
Aptio Setup Utility
Bypass Quick Setting
Set LAN Bypass to Normal, Bypass, Firewall or Custom Define Mode
Normal mode: All LAN ports in NORMAL. When Watchdog monitor system
hangs, software will initiates a system reboot.
Bypass mode: All LAN ports in BYPASS during power-off or watchdog initiates
Bypass. System will not reboot.
Firewall mode: All LAN ports in BYPASS until software change it to NORMAL
under OS. When watchdog monitors system hang, software will
initiates a system reboot.
Custom Define mode: Customer defines watchdog reset, watchdog Bypass and
power-off Bypass settings.
Aptio Setup Utility
MB839 Series User’s Manual 19
BIOS Setup
Main Advanced Chipset Boot Security Save & Exit
COM0
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
Console Redirection
►Console Redirection Setting
Serial Port for Out-of Band Management /
Windows Emergency Management Services (EMS)
[Enabled]
Console Redirection
►Console Redirection Settings
[Disabled]
Main Advanced Chipset Boot Security Save & Exit
COM0
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
Console Redirection Settings
Terminal Type
Bits per second
Data Bits
Parity
Stop Bits
[VT100]
[115200]
[8]
[None]
[1]
Flow Control
[None]
VT-UTF8 Combo Key Support
Recorder Mode
Resolution 100x31
Legacy OS Redirection Resolution
Putty KeyPad
Redirection After BIOS POST
[Enabled]
[Disabled]
[Disabled]
[80x24]
[VT100]
[Always Enable]
Main Advanced Chipset Boot Security Save & Exit
Socket 0 CPU Information
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
Intel(R) Celeron(R) CPU J1900 @ 1.99 GHz
Processor Speed
1990 MHz
Processor Cores
4
Intel HT Technology
Not Supported
Intel VT-X Technology
Supported
L1 Data Cache
24 kB x 4
L2 Data Cache
32 kB x 4
L2 Cache
1024 kB x2
Serial Port Console Redirection
Aptio Setup Utility
Console Redirection Setting
CPU Configuration
This section shows the CPU configuration parameters.
Aptio Setup Utility
20
MB839 Series User’s Manual
BIOS Setup
MB839 Series User’s Manual 21
BIOS Setup
Main Advanced Chipset Boot Security Save & Exit
PPM Configuration
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
EIST
[Enabled]
Main Advanced Chipset Boot Security Save & Exit
IDE Configuration
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
Serial-ATA (SATA)
SATA Speed Support
SATA Mode
Serial-STA Port 0
[Enable]
[Gen2]
[IDE Mode]
[Enable]
SATA Port0 HotPlug
[Disabled]
Serial-STA Port 1
SATA Port1 HotPlug
[Enable]
[Disabled]
SATA Port0
TRANSCEND (4.0GB)
SATA Port1
SAMSUNG 470 Se (64.0GB)
PPM Configuration
Aptio Setup Utility
IDE Configuration
Aptio Setup Utility
SATA Controller(s)
Enable / Disable Serial ATA Controller.
Configure SATA as
(1) IDE Mode.
(2) AHCI Mode.
22
MB839 Series User’s Manual
BIOS Setup
Main Advanced Chipset Boot Security Save & Exit
SDIO Configuration
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
SDIO Access Mode
[Auto]
Main Advanced Chipset Boot Security Save & Exit
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
► North Bridge
► South Bridge
Main Advanced Chipset Boot Security Save & Exit
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
Memory Information
Total Memory
Memory Slot0
2048 MB (LPDDR3)
2048 MB (LPDDR3)
SDIO Configuration
Aptio Setup Utility
Auto: Access SD device in DMA mode if controller supports it,
otherwise in PIO mode.
DMA: Access SE device in DMA mode.
PIO: Access SD device in PIO mode.
Chipset Settings
This section allows you to configure and improve your system and allows
you to set up some system features according to your preference.
Aptio Setup Utility
North Bridge
Aptio Setup Utility
MB839 Series User’s Manual 23
BIOS Setup
Main Advanced Chipset Boot Security Save & Exit
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
Restore AC Power Loss
[Power On]
Main Advanced Chipset Security Boot Save & Exit
Password Description
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
If ONLY the Administrator’s password is set,
then this only limits access to Setup and is
only asked for when entering Setup.
If ONLY the User’s password is set, then this
is a power on password and must be entered to
boot or enter Setup. In Setup the User will
have Administrator rights.
The password length must be
in the following range:
Minimum length
Maximum length
3
20
Administrator Password
User Password
HDD Security Configuration:
HDD0: TRANSCEND
HDD1: SAMSUNG 470
South Bridge
Power On: motherboard will Power ON when DC power source plugged.
Power Off: motherboard will Power ON when power switch (SW2)
pushed.
Security Settings
This section allows you to configure and improve your system and allows
you to set up some system features according to your preference.
Aptio Setup Utility
Administrator Password
Set Setup Administrator Password.
User Password
Set User Password.
24
MB839 Series User’s Manual
Main Advanced Chipset Boot Security Save & Exit
Boot Configuration
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
Setup Prompt Timeout
10
Bootup NumLock State
[On]
Quiet Boot
[Enabled]
Fast Boot
[Disabled]
Boot Option Priorities
Boot Option #1
[PATA PM: TRANS..]
Boot Option #2
[Disabled]
Hard Drive BBS Priorities
Main Advanced Chipset Boot Security Save & Exit
Save Changes and Exit
→ ← Select Screen
↑↓ Select Item
Enter: Select
+- Change Field
F1: General Help
F2: Previous Values
F3: Optimized Default
F4: Save ESC: Exit
Discard Changes and Exit
Save Changes and Reset
Discard Changes and Reset
Save Options
Save Changes
Discard Changes
Restore Defaults
Save as User Defaults
Restore User Defaults
Boot Override
Boot Settings
Aptio Setup Utility
Boot Option Priorities
Sets the system boot order.
Hard Drive BBS Priorities
Sets the SATA devices boot order.
Save & Exit Settings
Aptio Setup Utility
BIOS Setup
Save Changes and Exit
Exit system setup after saving the changes.
MB839 Series User’s Manual 25
BIOS Setup
Discard Changes and Exit
Exit system setup without saving any changes.
Save Changes and Reset
Reset the system after saving the changes.
Discard Changes and Reset
Reset system setup without saving any changes.
Save Changes
Save Changes done so far to any of the setup options.
Discard Changes
Discard Changes done so far to any of the setup options.
Restore Defaults
Restore/Load Defaults values for all the setup options.
Save as User Defaults
Save the changes done so far as User Defaults.
Restore User Defaults
Restore the User Defaults to all the setup options.
Boot Override
Pressing ENTER causes the system to enter the OS.
26
MB839 Series User’s Manual
DRIVERS INSTALLATION
Drivers Installation
This section describes the installation procedures for software and
drivers. The software and drivers are included with the motherboard. If
you find the items missing, please contact the vendor where you made the
purchase. The contents of this section include the following:
Intel Chipset Software Installation Utility ........................................... 27
VGA Drivers Installation ..................................................................... 28
LAN Drivers Installation ..................................................................... 30
IMPORTANT NOTE:
After installing your Windows operating system, you must install first the
Intel Chipset Software Installation Utility before proceeding with the
drivers installation.
MB839 Series User’s Manual 27
DRIVERS INSTALLATION
Intel Chipset Software Installation Utility
The Intel Chipset Drivers should be installed first before the software
drivers to enable Plug & Play INF support for Intel chipset components.
Follow the instructions below to complete the installation.
1. Insert the disc that comes with the board. Click Intel and then Intel(R)
Cedarview Chipset Drivers.
2. Click Intel(R) Chipset Software Installation Utility.
3. When the Welcome screen to the Intel® Chipset Device Software
appears, click Next to continue.
4. Click Yes to accept the software license agreement and proceed with
the installation process.
5. On the Readme File Information screen, click Next to continue the
installation.
6. The Setup process is now complete. Click Finish to restart the
computer and for changes to take effect.
28
MB839 Series User’s Manual
DRIVERS INSTALLATION
VGA Drivers Installation
1. Insert the disc that comes with the board. Click Intel and then Intel(R)
Cedarview Chipset Drivers.
2. Click Intel(R) Cedarview Graphics Driver.
MB839 Series User’s Manual 29
DRIVERS INSTALLATION
3. When the Welcome screen appears, click Next to continue.
4. Click Yes to to agree with the license agreement and continue the
installation.
5. On the Readme File Information screen, click Next to continue the
installation of the Intel® Graphics Media Accelerator Driver.
6. On Setup Progress screen, click Next to continue.
7. Setup complete. Click Finish to restart the computer and for changes
to take effect.
30
MB839 Series User’s Manual
LAN Drivers Installation
1. Insert the disc that comes with the board. Click LAN Card and then
Intel LAN Cedarview Drivers.
2. On the next screen, click Install Drivers and Software.
DRIVERS INSTALLATION
3. In the Welcome screen, click Next. On the next screen, click Yes to to
agree with the license agreement.
4. Agree with the license agreement and click Next.
MB839 Series User’s Manual 31
DRIVERS INSTALLATION
5. Click the checkbox for Drivers in the Setup Options screen to select it
and click Next to continue.
6. The wizard is ready to begin installation. Click Install to begin the
installation.
7. When InstallShield Wizard is complete, click Finish.
32
MB839 Series User’s Manual
Address
Device Description
000h - 01Fh
DMA Controller #1
020h - 03Fh
Interrupt Controller #1
040h - 05Fh
Timer
060h - 06Fh
Keyboard Controller
070h - 07Fh
Real Time Clock, NMI
080h - 09Fh
DMA Page Register
0A0h - 0BFh
Interrupt Controller #2
0C0h - 0DFh
DMA Controller #2
0F0h
Clear Math Coprocessor Busy Signal
0F1h
Reset Math Coprocessor
1F0h - 1F7h
IDE Interface
2F8h - 2FFh
Serial Port #2(COM2)
2B0h- 2DFh
Graphics adapter Controller
360h - 36Fh
Network Ports
3F8h - 3FFh
Serial Port #1(COM1)
APPENDIX
Appendix
A. I/O Port Address Map
Each peripheral device in the system is assigned a set of I/O port
addresses which also becomes the identity of the device. The following
table lists the I/O port addresses used.
MB839 Series User’s Manual 33
APPENDIX
Level
Function
IRQ 0
System timer
IRQ 1
Standard PS/2 Keyboard
IRQ 3
Communications Port (COM2)
IRQ 4
Communications Port (COM1)
IRQ 5
Communications Port (COM3)
IRQ 7
Communications Port (COM4)
IRQ 8
System CMOS/real time clock
IRQ 11
Intel(R) N10/ICH7 Family SMBus Controller 27DA
IRQ 12
Microsoft PS/2 Mouse
IRQ 13
Numeric data processor
IRQ 16
Intel(R) N10/ICH7 Family USB Universal Host
Controller - 27CB
IRQ 18
Intel(R) N10/ICH7 Family USB Universal Host
Controller - 27CA
IRQ 19
Intel(R) N10/ICH7 Family Serial ATA Storage
Controller - 27C0
IRQ 19
Intel(R) N10/ICH7 Family USB Universal Host
Controller - 27C9
IRQ 22
High Definition Audio Controller
IRQ 23
Intel(R) N10/ICH7 Family USB2 Enhanced Host
Controller - 27CC
IRQ 23
Intel(R) N10/ICH7 Family USB Universal Host
Controller - 27C8
IRQ 4294967290
Intel(R) 82583V Gigabit Network Connection
IRQ 4294967291
Intel(R) 82583V Gigabit Network Connection #2
IRQ 4294967292
Intel(R) Graphics Media Accelerator 3600 Series
IRQ 4294967293
Intel(R) N10/ICH7 Family PCI Express Root Port 27D2
IRQ 4294967294
Intel(R) N10/ICH7 Family PCI Express Root Port 27D0
B. Interrupt Request Lines (IRQ)
Peripheral devices use interrupt request lines to notify CPU for the
service required. The following table shows the IRQ used by the devices
on board.
34
MB839 Series User’s Manual
APPENDIX
C. Watchdog Timer Configuration
The WDT is used to generate a variety of output signals after a user
programmable count. The WDT is suitable for use in the prevention of
system lock-up, such as when software becomes trapped in a deadlock.
Under these sorts of circumstances, the timer will count to zero and the
selected outputs will be driven. Under normal circumstance, the user will
restart the WDT at regular intervals before the timer counts to zero.
SAMPLE CODE:
File of the NCT5523D.H
//--------------------------------------------------------------------------//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//
//--------------------------------------------------------------------------#ifndef __NCT5523D_H
#define __NCT5523D_H 1
//--------------------------------------------------------------------------#define NCT5523D_INDEX_PORT (NCT5523D_BASE)
#define NCT5523D_DATA_PORT (NCT5523D_BASE+1)
//--------------------------------------------------------------------------#define NCT5523D_REG_LD 0x07
//--------------------------------------------------------------------------#define NCT5523D_UNLOCK 0x87
#define NCT5523D_LOCK 0xAA
//--------------------------------------------------------------------------unsigned int Init_NCT5523D(void);
void Set_NCT5523D_LD( unsigned char);
void Set_NCT5523D_Reg( unsigned char, unsigned char);
unsigned char Get_NCT5523D_Reg( unsigned char);
//--------------------------------------------------------------------------#endif //__NCT5523D_H
MB839 Series User’s Manual 35
APPENDIX
File of the MAIN.CPP.
//--------------------------------------------------------------------------//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//
//--------------------------------------------------------------------------#include <dos.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include "NCT5523D.H"
//--------------------------------------------------------------------------int main (void);
void WDTInitial(void);
void WDTEnable(unsigned char);
void WDTDisable(void);
//--------------------------------------------------------------------------int main (void)
{
char SIO;
SIO = Init_NCT5523D();
if (SIO == 0)
{
printf("Can not detect Nuvoton NCT5523D, program abort.\n");
return(1);
}
WDTInitial();
WDTEnable(10);
WDTDisable();
return 0;
}
//--------------------------------------------------------------------------void WDTInitial(void)
{
unsigned char bBuf;
Set_NCT5523D_LD(0x08); //switch to logic device 8
bBuf = Get_NCT5523D_Reg(0x30);
bBuf &= (~0x01);
Set_NCT5523D_Reg(0x30, bBuf); //Enable WDTO
}
//---------------------------------------------------------------------------
36
MB839 Series User’s Manual
APPENDIX
void WDTEnable(unsigned char NewInterval)
{
unsigned char bBuf;
Set_NCT5523D_LD(0x08); //switch to logic device 8
Set_NCT5523D_Reg(0x30, 0x01); //enable timer
bBuf = Get_NCT5523D_Reg(0xF0);
bBuf &= (~0x08);
Set_NCT5523D_Reg(0xF0, bBuf); //count mode is second
Set_NCT5523D_Reg(0xF1, NewInterval); //set timer
}
//--------------------------------------------------------------------------void WDTDisable(void)
{
Set_NCT5523D_LD(0x08); //switch to logic device 8
Set_NCT5523D_Reg(0xF1, 0x00); //clear watchdog timer
Set_NCT5523D_Reg(0x30, 0x00); //watchdog disabled
}
//---------------------------------------------------------------------------
MB839 Series User’s Manual 37
APPENDIX
File of the NCT5523D.CPP
//--------------------------------------------------------------------------//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//
//--------------------------------------------------------------------------#include "NCT5523D.H"
#include <dos.h>
//--------------------------------------------------------------------------unsigned int NCT5523D_BASE;
void Unlock_NCT5523D (void);
void Lock_NCT5523D (void);
//--------------------------------------------------------------------------unsigned int Init_NCT5523D(void)
{
unsigned int result;
unsigned char ucDid;
NCT5523D_BASE = 0x4E;
result = NCT5523D_BASE;
ucDid = Get_NCT5523D_Reg(0x20);
if (ucDid == 0xC4) //NCT5523D??
{ goto Init_Finish; }
NCT5523D_BASE = 0x2E;
result = NCT5523D_BASE;
ucDid = Get_NCT5523D_Reg(0x20);
if (ucDid == 0xC4) //NCT5523D??
{ goto Init_Finish; }
NCT5523D_BASE = 0x00;
result = NCT5523D_BASE;
Init_Finish:
return (result);
}
//--------------------------------------------------------------------------void Unlock_NCT5523D (void)
{
outportb(NCT5523D_INDEX_PORT, NCT5523D_UNLOCK);
outportb(NCT5523D_INDEX_PORT, NCT5523D_UNLOCK);
}
//--------------------------------------------------------------------------void Lock_NCT5523D (void)
{
outportb(NCT5523D_INDEX_PORT, NCT5523D_LOCK);
}
//---------------------------------------------------------------------------
38
MB839 Series User’s Manual
void Set_NCT5523D_LD( unsigned char LD)
{
Unlock_NCT5523D();
outportb(NCT5523D_INDEX_PORT, NCT5523D_REG_LD);
outportb(NCT5523D_DATA_PORT, LD);
Lock_NCT5523D();
}
//--------------------------------------------------------------------------void Set_NCT5523D_Reg( unsigned char REG, unsigned char DATA)
{
Unlock_NCT5523D();
outportb(NCT5523D_INDEX_PORT, REG);
outportb(NCT5523D_DATA_PORT, DATA);
Lock_NCT5523D();
}
//--------------------------------------------------------------------------unsigned char Get_NCT5523D_Reg(unsigned char REG)
{
unsigned char Result;
Unlock_NCT5523D();
outportb(NCT5523D_INDEX_PORT, REG);
Result = inportb(NCT5523D_DATA_PORT);
Lock_NCT5523D();
return Result;
}
//------------------------------------------------------------------------
APPENDIX
MB839 Series User’s Manual 39
APPENDIX
D. Digital I/O Sample Code
File of the NCT5523D.H
//--------------------------------------------------------------------------// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//--------------------------------------------------------------------------#ifndef __NCT5523D_H
#define __NCT5523D_H 1
//--------------------------------------------------------------------------#define NCT5523D_INDEX_PORT (NCT5523D_BASE)
#define NCT5523D_DATA_PORT (NCT5523D_BASE+1)
//--------------------------------------------------------------------------#define NCT5523D_REG_LD 0x07
//--------------------------------------------------------------------------#define NCT5523D_UNLOCK 0x87
#define NCT5523D_LOCK 0xAA
//--------------------------------------------------------------------------unsigned int Init_NCT5523D(void);
void Set_NCT5523D_LD( unsigned char);
void Set_NCT5523D_Reg( unsigned char, unsigned char);
unsigned char Get_NCT5523D_Reg( unsigned char);
//--------------------------------------------------------------------------#endif //__NCT5523D_H
40
MB839 Series User’s Manual
APPENDIX
File of the MAIN.CPP
//--------------------------------------------------------------------------// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//--------------------------------------------------------------------------#include <dos.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include "NCT5523D.H"
//--------------------------------------------------------------------------int main (void);
void Dio5Initial(void);
void Dio5SetOutput(unsigned char);
unsigned char Dio5GetInput(void);
void Dio5SetDirection(unsigned char);
unsigned char Dio5GetDirection(void);
//--------------------------------------------------------------------------int main (void)
{
char SIO;
SIO = Init_NCT5523D();
if (SIO == 0)
{
printf("Can not detect Nuvoton NCT5523D, program abort.\n");
return(1);
}
Dio5Initial();
//for GPIO20..27
Dio5SetDirection(0x0F); //GP20..23 = input, GP24..27=output
printf("Current DIO direction = 0x%X\n", Dio5GetDirection());
printf("Current DIO status = 0x%X\n", Dio5GetInput());
printf("Set DIO output to high\n");
Dio5SetOutput(0x0F);
printf("Set DIO output to low\n");
Dio5SetOutput(0x00);
return 0;
}
//---------------------------------------------------------------------------
MB839 Series User’s Manual 41
APPENDIX
void Dio5Initial(void)
{
unsigned char ucBuf;
ucBuf = Get_NCT5523D_Reg(0x1C);
ucBuf &= ~0x02;
Set_NCT5523D_Reg(0x1C, ucBuf);
Set_NCT5523D_LD(0x07); //switch to logic device 7
//enable the GP2 group
ucBuf = Get_NCT5523D_Reg(0x30);
ucBuf |= 0x04;
Set_NCT5523D_Reg(0x30, ucBuf);
}
//--------------------------------------------------------------------------void Dio5SetOutput(unsigned char NewData)
{
Set_NCT5523D_LD(0x07); //switch to logic device 7
Set_NCT5523D_Reg(0xE1, NewData);
}
//--------------------------------------------------------------------------unsigned char Dio5GetInput(void)
{
unsigned char result;
Set_NCT5523D_LD(0x07); //switch to logic device 7
result = Get_NCT5523D_Reg(0xE1);
return (result);
}
//--------------------------------------------------------------------------void Dio5SetDirection(unsigned char NewData)
{
//NewData : 1 for input, 0 for output
Set_NCT5523D_LD(0x07); //switch to logic device 7
Set_NCT5523D_Reg(0xE8, NewData);
}
//--------------------------------------------------------------------------unsigned char Dio5GetDirection(void)
{
unsigned char result;
Set_NCT5523D_LD(0x07); //switch to logic device 7
result = Get_NCT5523D_Reg(0xE8);
return (result);
}
//---------------------------------------------------------------------------
42
MB839 Series User’s Manual
APPENDIX
File of the NCT5523D.CPP
//--------------------------------------------------------------------------// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//--------------------------------------------------------------------------#include "NCT5523D.H"
#include <dos.h>
//--------------------------------------------------------------------------unsigned int NCT5523D_BASE;
void Unlock_NCT5523D (void);
void Lock_NCT5523D (void);
//--------------------------------------------------------------------------unsigned int Init_NCT5523D(void)
{
unsigned int result;
unsigned char ucDid;
NCT5523D_BASE = 0x4E;
result = NCT5523D_BASE;
ucDid = Get_NCT5523D_Reg(0x20);
if (ucDid == 0xC4) //NCT5523D??
{ goto Init_Finish; }
NCT5523D_BASE = 0x2E;
result = NCT5523D_BASE;
ucDid = Get_NCT5523D_Reg(0x20);
if (ucDid == 0xC4) //NCT5523D??
{ goto Init_Finish; }
NCT5523D_BASE = 0x00;
result = NCT5523D_BASE;
Init_Finish:
return (result);
}
//--------------------------------------------------------------------------void Unlock_NCT5523D (void)
{
outportb(NCT5523D_INDEX_PORT, NCT5523D_UNLOCK);
outportb(NCT5523D_INDEX_PORT, NCT5523D_UNLOCK);
}
//--------------------------------------------------------------------------void Lock_NCT5523D (void)
{
outportb(NCT5523D_INDEX_PORT, NCT5523D_LOCK);
}
//---------------------------------------------------------------------------
MB839 Series User’s Manual 43
APPENDIX
void Set_NCT5523D_LD( unsigned char LD)
{
Unlock_NCT5523D();
outportb(NCT5523D_INDEX_PORT, NCT5523D_REG_LD);
outportb(NCT5523D_DATA_PORT, LD);
Lock_NCT5523D();
}
//--------------------------------------------------------------------------void Set_NCT5523D_Reg( unsigned char REG, unsigned char DATA)
{
Unlock_NCT5523D();
outportb(NCT5523D_INDEX_PORT, REG);
outportb(NCT5523D_DATA_PORT, DATA);
Lock_NCT5523D();
}
//--------------------------------------------------------------------------unsigned char Get_NCT5523D_Reg(unsigned char REG)
{
unsigned char Result;
Unlock_NCT5523D();
outportb(NCT5523D_INDEX_PORT, REG);
Result = inportb(NCT5523D_DATA_PORT);
Lock_NCT5523D();
return Result;
}
//---------------------------------------------------------------------------
44
MB839 Series User’s Manual
APPENDIX
I2C Address (8bit)
Remark
1st Controller
0x68
2nd Controller
0x6A
Optional
Bit
LAN
Port#
Read /
Write
Description
0
Eth3, 4
Read /
Write
Enable / Disable LAN Bypass
function when the system is
power On.
1 = Enable LAN Bypass function
0 = Disable LAN Bypass function
Bit
LAN
Port#
Read /
Write
Description
0
Eth3, 4
Read /
Write
Enable / Disable LAN Bypass
function when the system is power
Off.
1 = Enable LAN Bypass function
0 = Disable LAN Bypass function
E. Register of the LAN Bypass Controller
To fulfill the varied requests on LAN Bypass controller, IBASE provide
the smart LAN Bypass controller. User can define the Bypass function
behavior when the system is power-on, power-off and WDT signal is
asserted.
The controller is behind the SMBus controller. The I2C address is listed
as below:
CR 0x22 : System-On Bypass Register
Attribute : Read / Write
Reset default : 0x0000
CR 0x24 : System-Off Bypass Register
Attribute : Read / Write
Reset default : 0x0000
MB839 Series User’s Manual 45
APPENDIX
Bit
Read /
Write
Description
0
Read /
Write
WDT_OUT# Generator
The capacity use the WDT to reset the
system
1 = Generate 100ms pulse to reset signal
when WDT signal is asserted.
0 = Ignore the WDT signal.
1
Read /
Write
WDT LAN Bypass Enable
The capacity use the WDT to set LAN
Bypass function
1 = Enable LAN Bypass function when the
WDT signal is asserted.
CR 0x28 and CR 0x2A will be available if
this bit is set to "1".
0 = Disable WDT LAN Bypass function.
2 ~ 7
Reserved
Bit
LAN
Port#
Read /
Write
Description
0
Eth3, 4
Read /
Write
Enable / Disable WDT Bypass
function for each LAN port.
1 = Follow the setting in "WDT
Bypass Register CR 0x2A"
when the WDT signal is
asserted.
0 = Ignore to control the bypass
when the WDT is asserted.
CR 0x26 : Watchdog (WDT) WDT_IN# Signal Control Register
Attribute : Read / Write
Reset default : 0x00
CR 0x28 : Watchdog (WDT) Bypass Control Register
Attribute : Read / Write
Reset default : 0x0000
46
MB839 Series User’s Manual
Bit
LAN
Port#
Read /
Write
Description
0
Eth3, 4
Read /
Write
The function works when the bit
in CR 0x28 is “1”. It controls
LAN Bypass function should be
Enabled / Disabled when the
WDT signal is asserted.
If the bit is set to "1" in "WDT
Bypass Control Register
CR 0x28", it will follow below
setting:
1 = Enable LAN Bypass function
0 = Disable LAN Bypass
function
CR 0x2A : Watchdog (WDT) Bypass Register
Attribute : Read / Write
Reset default : 0x0000
APPENDIX
MB839 Series User’s Manual 47
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