Page 1
SBC87842
Intel® AtomTM E3827 and Celeron®
N2807 Processor Single Board
Computer
User’s Manual
Page 2
ii
Disclaimers
This manual has been carefully checked and believed to contain accurate information.
Axiomtek Co., Ltd. assumes no responsibility for any infringements of patents or any third
party’s rights, and any liability arising from such use.
Axiomtek does not warrant or assume any legal liability or responsibility for the accuracy,
completeness or usefulness of any information in this document. Axiomtek does not make any
commitment to update the information in this manual.
Axiomtek reserves the right to change or revise this document and/or product at any time
without notice.
No part of this document may be reproduced, stored in a retrieval system, or transmitted, in
any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
without the prior written permission of Axiomtek Co., Ltd.
CAUTION
If you replace wrong batteries, it causes the danger of explosion. It is recommended by the
manufacturer that you follow the manufacturer’s instructions to only replace the same or
equivalent type of battery, and dispose of used ones.
Copyright 2015 Axiomtek Co., Ltd.
All Rights Reserved
October 2015, Version A1
Printed in Taiwan
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iii
ESD Precautions
Computer boards have integrated circuits sensitive to static electricity. To prevent chipsets
from electrostatic discharge damage, please take care of the following jobs with precautions:
Do not remove boards or integrated circuits from their anti-static packaging until you are
ready to install them.
Before holding the board or integrated circuit, touch an unpainted portion of the system
unit chassis for a few seconds. It discharges static electricity from your body.
Wear a wrist-grounding strap, available from most electronic component stores, when
handling boards and components.
Trademarks Acknowledgments
Axiomtek is a trademark of Axiomtek Co., Ltd.
AMI is a trademark of American Megatrend Inc.
IBM, PC/AT, PS/2, VGA are trademarks of International Business Machines Corporation.
Intel® and Celeron® are trademarks of Intel Corporation.
Other brand names and trademarks are the properties and registered brands of their
respective owners.
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iv
Table of Contents
Disclaimers ..................................................................................................... ii
ESD Precautions ........................................................................................... iii
Chapter 1 Introduction ............................................. 1
1.1 Features ............................................................................................... 1
1.2 Specifications ...................................................................................... 2
1.3 Utilities Supported .............................................................................. 3
Chapter 2 Board and Pin Assignments .................... 5
2.1 Board Dimensions and Fixing Holes ................................................. 5
2.2 Board Layout ....................................................................................... 7
2.3 Jumper Settings .................................................................................. 8
2.3.1 Restore BIOS Optimal Defaults (JP2) ......................................................... 8
2.4 Connectors and LEDs ......................................................................... 9
2.4.1 Front Panel Connector (CN1) ................................................................... 10
2.4.2 Power Input Terminal Block (CN2) ............................................................ 10
2.4.3 SATA Power Connector (CN5) .................................................................. 10
2.4.4 Full-size PCI-Express Mini Card and mSATA Connector (CN6) ................ 11
2.4.5 VGA Connector (CN7) ............................................................................... 12
2.4.6 SIM Card Slot (CN9) ................................................................................. 12
2.4.7 Ethernet Port (CN10) ................................................................................ 12
2.4.8 COM1~COM4 Connectors (CN11~CN12) ................................................ 13
2.4.9 SMBus Connector (CN2001) .................................................................... 13
2.4.10 SATA Connector (SATA1) .......................................................................... 13
2.4.11 CompactFlash™ Socket (CF1) ................................................................. 14
2.4.12 USB Connector (USB1) ............................................................................ 15
2.4.13 LED Indicator (LED3) ................................................................................ 15
Chapter 3 Hardware Description ........................... 17
3.1 Microprocessors ............................................................................... 17
3.2 BIOS ................................................................................................... 17
3.3 System Memory ................................................................................. 17
3.4 I/O Port Address Map ........................................................................ 18
3.5 Interrupt Controller (IRQ) Map ......................................................... 20
3.6 Memory Map ...................................................................................... 25
Chapter 4 AMI BIOS Setup Utility .......................... 27
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4.1 Starting ............................................................................................... 27
4.2 Navigation Keys ................................................................................ 27
4.3 Main Menu .......................................................................................... 28
4.4 Advanced Menu ................................................................................. 29
4.5 Chipset Menu ..................................................................................... 40
4.6 Security Menu .................................................................................... 42
4.7 Boot Menu .......................................................................................... 43
4.8 Save & Exit Menu .............................................................................. 45
Appendix A Watchdog Timer ................................... 47
A.1 About Watchdog Timer ..................................................................... 47
A.2 How to Use Watchdog Timer ............................................................ 47
Appendix B Heatspreader (Optional) ...................... 49
B.1 Installing Heatspreader ..................................................................... 49
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SBC87842 Single Board Computer
Introduction 1
Chapter 1
Introduction
The SBC87842, a single board computer, supports Intel® AtomTM E3827 and Celeron
®
N2807
processors. The board delivers outstanding system performance through high-bandwidth
interfaces, multiple I/O functions for interactive applications and various embedded computing
solutions. There is one 204-pin SO-DIMM socket for single channel DDR3L 1333MHz memory
with maximum capacity up to 8GB. The board also features dual Gigabit Ethernet, one SATA,
one CompactFlash
TM
socket, and two USB 2.0 compliant ports to achieve the best stability and
reliability for industrial applications.
1.1 Features
Intel
®
AtomTM E3827 (1.75GHz) and Celeron
®
N2807 (1.58GHz)
1 DDR3L SO-DIMM supports up to 8GB memory capacity
4 COM ports
2 USB 2.0 ports
1 SATA 2.0
1 CompactFlash
TM
Wide operating temperature supported
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SBC87842 Single Board Computer
2 Introduction
1.2 Specifications
CPU
Intel
®
AtomTM dual core E3827 1.75GHz.
Intel
®
Celeron® dual core N2807 1.58GHz.
Thermal Solution
Passive.
An optional heatspreader.
Operating Temperature
-20
o
C~70oC.
-40
o
C~-80oC (Optional).
BIOS
AMI BIOS via SPI interface.
System Memory
One 204-pin unbuffered DDR3L SO-DIMM socket.
Maximum up to 8GB DDR3L 1333MHz memory.
Onboard Multi I/O
Four RS-232/422/485 ports selectable via BIOS setting.
Serial ATA
One SATA-300 connector.
mSATA support (Optional).
USB Interface
Two USB ports with fuse protection and complies with USB Spec. Rev. 2.0.
Display
One slim type 15-pin D-Sub as VGA connector.
Watchdog Timer
1~255 seconds or minutes; up to 255 levels.
Ethernet
Two RJ-45 LAN ports: Intel
®
i211AT supports 1000/100/10Mbps Gigabit/Fast
Ethernet with Wake-on-LAN and PXE Boot ROM.
Expansion Interface
One full-size PCI-Express Mini Card connector with mSATA support.
One SIM card slot.
One CompactFlash™ Type II socket.
Note
CompactFlashTM or mSATA support is selectable via BIOS setting.
Power Input
One 3-pin terminal block.
Wide range 12V~24V DC-in.
OVP and reverse protection.
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SBC87842 Single Board Computer
Introduction 3
Dimensions
143.05mm(W) x 104.65mm(D).
Note
All specifications and images are subject to change without notice.
1.3 Utilities Supported
Chipset and graphics driver
Ethernet driver
AHCI driver
Trusted Execution Engine
Sideband Fabric Device
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SBC87842 Single Board Computer
4 Introduction
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SBC87842 Single Board Computer
Board and Pin Assignments 5
Chapter 2
Board and Pin Assignments
2.1 Board Dimensions and Fixing Holes
Top View
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SBC87842 Single Board Computer
6 Board and Pin Assignments
Bottom View
Side View
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SBC87842 Single Board Computer
Board and Pin Assignments 7
2.2 Board Layout
Top View
Side View
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SBC87842 Single Board Computer
8 Board and Pin Assignments
2.3 Jumper Settings
Jumper is a small component consisting of jumper clip and jumper pins. Install jumper clip on 2
jumper pins to close. And remove jumper clip from 2 jumper pins to open. The following
illustration shows how to set up jumper.
Before applying power to SBC87842, please make sure all of the jumpers are in factory default
position. Below you can find a summary table of all jumpers and onboard default settings.
Note
Once the default jumper setting needs to be changed, please do it under power-off
condition.
Jumper
Description
Setting
JP2
Restore BIOS Optimal Defaults
Default: Normal Operation
1-2 Close
2.3.1 Restore BIOS Optimal Defaults (JP2)
Put jumper clip to pin 2-3 for a few seconds then move it back to pin 1-2. Doing this
procedure can restore BIOS optimal defaults.
Function
Setting
Normal operation (Default)
1-2 close
Restore BIOS optimal defaults
2-3 close
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SBC87842 Single Board Computer
Board and Pin Assignments 9
2.4 Connectors and LEDs
Signals go to other parts of the system through connectors. Loose or improper connection
might cause problems, please make sure all connectors are properly and firmly connected.
Here is a summary table which shows all connectors and LEDs on the hardware.
Connector/LED
Description
CN1
Front Panel Connector
CN2
Power Input Terminal Block
CN5
SATA Power Connector
CN6
Full-size PCI-Express Mini Card and mSATA Connector
CN7
VGA Connector
CN9
SIM Card Slot
CN10
Ethernet Port 1 and 2
CN11~CN12
COM1~COM4 Connectors
CN2001
SMBus Connector
SATA1
SATA Connector
CF1
CompactFlashTM Socket
USB1
USB 2.0 Port 0 and 1
SODIMM1
DDR3L SO-DIMM Socket
LED3
LED Indicator
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SBC87842 Single Board Computer
10 Board and Pin Assignments
2.4.1 Front Panel Connector (CN1)
HDD Activity LED
This connection is linked to hard drive activity LED on the control panel. LED flashes
when HDD is being accessed. Pin 1 and 3 connect the hard disk drive to the front panel
HDD LED, pin 3 is assigned as cathode(-) and pin 1 is assigned as anode(+).
System Reset Switch
Pin 5 and 6 connect the case-mounted reset switch that reboots your computer without
turning off the power switch. It is a better way to reboot your system for a longer life of
system power supply.
Power On/Off Button
Pin 7 and 8 connect the power button on front panel to the CPU board, which allows
users to turn on or off power supply.
2.4.2 Power Input Terminal Block (CN2)
The board is equipped with a 3-pin terminal block for 12~24VDC power input.
2.4.3 SATA Power Connector (CN5)
This is a 2-pin connector for interfacing to SATA 2.5" HDD power supply.
Pin
Signal
1
HDDLED+
2
+3.3V
3
HDDLED-
4
+3.3V
5
HW RST+
6
HW RST-
7
PWRSW+
8
PWRSW-
Pin
Signal
1
+
2
NC 3 -
Pin
Signal
1
+5V
2
GND
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SBC87842 Single Board Computer
Board and Pin Assignments 11
2.4.4 Full-size PCI-Express Mini Card and mSATA Connector
(CN6)
The CN6 is a full-size PCI-Express Mini Card connector applying to either PCI-Express
or USB 2.0 with mSATA support. It also complies with PCI-Express Mini Card Spec.
V1.2.
Note
Please refer to section 4.4 to select CompactFlashTM or mSATA..
Pin
Signal
Pin
Signal
1
WAKE#
2
+3.3VSB
3
RSVD1
4
GND
5
RSVD2
6
+1.5V
7
CLKREQ#
8
SIM_PWR
9
GND
10
SIM_I/O
11
REFCLK-
12
SIM_CLK
13
REFCLK+
14
SIM_RST
15
GND
16
SIM_VCC
17
RSVD3
18
GND
19
RSVD4
20
RSVD9
21
GND
22
PERST#
23
PE_RXN0/
SATA_RXP1
24
+3.3VSB
25
PE_RXP0/
SATA_RXN1
26
GND
27
GND
28
+1.5V
29
GND
30
SMB_CLK
31
PE_TXN0/
SATA_TXN1
32
SMB_DATA
33
PE_TXP0/
SATA_TXP1
34
GND
35
GND
36
USB_D4-
37
GND
38
USB_D4+
39
+3.3VSB
40
GND
41
+3.3VSB
42
RSVD
43
GND
44
RSVD
45
RSVD5
46
RSVD
47
RSVD6
48
+1.5V
49
RSVD7
50
GND
51
RSVD8
52
+3.3VSB
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12 Board and Pin Assignments
2.4.5 VGA Connector (CN7)
This is a 15-pin D-Sub connector which is commonly used for VGA display. This VGA
interface configuration can be configured via software utility.
2.4.6 SIM Card Slot (CN9)
The CN9 is for inserting SIM Card. It is mainly used in 3G wireless network application.
In order to work properly, the SIM Card must be used together with 3G module which is
inserted to CN6.
2.4.7 Ethernet Port (CN10)
The board has two RJ-45 connectors. Ethernet connection can be established by
plugging one end of the Ethernet cable into this RJ-45 connector and the other end
(phone jack) to a 1000/100/10-Base-T hub.
Pin
Signal
Pin
Signal
1
Red 2 Green
3
Blue 4 N.C. 5 GND
6
DETECT
7
GND
8
GND
9
VCC
10
GND
11
N.C.
12
DDC DATA
13
Horizontal Sync
14
Vertical Sync
15
DDC CLK
Pin
Signal
1
PWR
2
RST 3 CLK 4 NC
5
GND
6
VPP 7 I/O 8 NC
Pin
Signal
Pin
Signal
1
MDI0+
5
MDI2+
2
MDI0-
6
MDI2-
3
MDI1+
7
MDI3+
4
MDI1-
8
MDI3-
A
Active LED (Yellow)
B
100 LAN LED (Green) / 1000 LAN LED
(Orange)
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SBC87842 Single Board Computer
Board and Pin Assignments 13
2.4.8 COM1~COM4 Connectors (CN11~CN12)
The board comes with four standard DB-9 connectors on the rear I/O for
RS-232/422/485 interfaces. If you need these COM ports to support RS-422 or RS-485,
please refer to BIOS setting in section 4.4.
2.4.9 SMBus Connector (CN2001)
This is a 4-pin connector for SMBus interface. The SMBus (System Management Bus) is
a simple bus for the purpose of lightweight communication.
2.4.10 SATA Connector (SATA1)
This Serial Advanced Technology Attachment (Serial ATA or SATA) connector is for
high-speed SATA interface. It is a computer bus interface for connecting to devices such
as hard disk drive.
Pin
RS-232
RS-422
RS-485
1
DCD
TX-
Data-
2
RXD
TX+
Data+
3
TXD
RX+
No use
4
DTR
RX-
No use
5
GND
GND
GND
6
DSR
No use
No use
7
RTS
No use
No use
8
CTS
No use
No use
9
RI
No use
No use
Pin
Signal
1
+5V 2 Clock
3
Data
4
GND
Pin
Signal
1
GND
2
TXP 3 TXN 4 GND
5
RXN
6
RXP 7 GND
1 7
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14 Board and Pin Assignments
2.4.11 CompactFlash™ Socket (CF1)
The board is equipped with a CompactFlashTM disk type-II socket to support an IDE
interface CompactFlashTM disk card with DMA mode supported. The socket is especially
designed to avoid incorrect installation. When installing or removing the CompactFlashTM
disk card, please make sure the system power is off.
1
2 3 4 5 6 7 8 9 1011 12 1314 151617 18 1920 212223 24
26
2728 29 3031 323334 35 363738 39 40 414243 44 454647 48 49
25
50
Note
Please refer to section 4.4 to select CompactFlashTM or mSATA..
Pin
Signal
Pin
Signal
1
GND
26
CD1-
2
Data 3
27
Data 11
3
Data 4
28
Data 12
4
Data 5
29
Data 13
5
Data 6
30
Data 14
6
Data 7
31
Data 15
7
CS0#
32
CS1#
8
Address 10
33
VS1#
9
ATASEL
34
IORD#
10
Address 9
35
IOWR#
11
Address 8
36
WE#
12
Address 7
37
INTR
13
VCC
38
VCC
14
Address 6
39
CSEL#
15
Address 5
40
VS2#
16
Address 4
41
RESET#
17
Address 3
42
IORDY#
18
Address 2
43
DMAREQ
19
Address 1
44
DMAACK-
20
Address 0
45
DASP#
21
Data 0
46
PDIAG#
22
Data 1
47
Data 8
23
Data 2
48
Data 9
24
IOCS16#
49
Data 10
25
CD2#
50
GND
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SBC87842 Single Board Computer
Board and Pin Assignments 15
2.4.12 USB Connector (USB1)
This is a Universal Serial Bus (compliant with USB 2.0 (480Mbps)) connector on the rear
I/O. It is commonly used for installing USB peripherals such as keyboard, mouse,
scanner, etc.
1 2 3 4
5 6 7 8
2.4.13 LED Indicator (LED3)
The storage LED (green) is linked to Hard Disk Drive (HDD) activity signal. LED flashes
every time when HDD is accessed.
The power LED (yellow) lights up and remain steady while the system is powered on.
Pin
Signal
Pin
Signal
1
USB VCC (+5V)
5
USB VCC (+5V)
2
USB #0_D-
6
USB #1_D-
3
USB #0_D+
7
USB #1_D+
4
GND
8
GND
Color
Description
Green
Hard disk drive activity
Yellow
Power status
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16 Board and Pin Assignments
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SBC87842 Single Board Computer
Hardware Description 17
Chapter 3
Hardware Description
3.1 Microprocessors
The SBC87842 supports Intel® AtomTM E3827 and Celeron
®
N2807 processors, which enable
your system to operate under Windows® 7, Windows® 8 and Linux environments. The system
performance depends on the microprocessor. Make sure all correct settings are arranged for
your installed microprocessor to prevent the CPU from damages.
3.2 BIOS
The SBC87842 uses AMI Plug and Play BIOS with a single 64Mbit SPI Flash.
3.3 System Memory
The SBC87842 supports one 204-pin DDR3L SO-DIMM socket for maximum memory capacity
up to 8GB DDR3L SDRAMs. The memory module comes in sizes of 1GB, 2GB, 4GB and 8GB.
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18 Hardware Description
3.4 I/O Port Address Map
The I/O port address mapping list is shown as follows:
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Hardware Description 19
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20 Hardware Description
3.5 Interrupt Controller (IRQ) Map
The interrupt controller (IRQ) mapping list is shown as follows:
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Hardware Description 21
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22 Hardware Description
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Hardware Description 23
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24 Hardware Description
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Hardware Description 25
3.6 Memory Map
The memory mapping list is shown as follows:
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26 Hardware Description
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SBC87842 Single Board Computer
AMI BIOS Setup Utility 27
Chapter 4
AMI BIOS Setup Utility
The AMI UEFI BIOS provides users with a built-in setup program to modify basic system
configuration. All configured parameters are stored in a flash chip to save the setup information
whenever the power is turned off. This chapter provides users with detailed description about
how to set up basic system configuration through the AMI BIOS setup utility.
4.1 Starting
To enter the setup screens, follow the steps below:
1. Turn on the computer and press the <Del> key immediately.
2. After you press the <Del> key, the main BIOS setup menu displays. You can access the
other setup screens from the main BIOS setup menu, such as the Advanced and Chipset
menus.
Note
If your computer cannot boot after making and saving system changes with BIOS
setup, you can restore BIOS optimal defaults by setting JP2 (see section 2.4.1).
It is strongly recommended that you should avoid changing the chipset’s defaults. Both AMI
and your system manufacturer have carefully set up these defaults that provide the best
performance and reliability.
4.2 Navigation Keys
The BIOS setup/utility uses a key-based navigation system called hot keys. Most of the BIOS
setup utility hot keys can be used at any time during the setup navigation process. These keys
include <F1>, <F2>, <Enter>, <ESC>, <Arrow> keys, and so on.
Note
Some of the navigation keys differ from one screen to another.
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SBC87842 Single Board Computer
28 AMI BIOS Setup Utility
Hot Keys
Description
Left/Right
The Left and Right <Arrow> keys allow you to select a setup screen.
Up/Down
The Up and Down <Arrow> keys allow you to select a setup screen or
sub-screen.
+ Plus/Minus
The Plus and Minus <Arrow> keys allow you to change the field value of a
particular setup item.
Tab
The <Tab> key allows you to select setup fields.
F1
The <F1> key allows you to display the General Help screen.
F2
The <F2> key allows you to Load Previous Values.
F3
The <F3> key allows you to Load Optimized Defaults.
F4
The <F4> key allows you to save any changes you have made and exit
Setup. Press the <F4> key to save your changes.
Esc
The <Esc> key allows you to discard any changes you have made and exit
the Setup. Press the <Esc> key to exit the setup without saving your
changes.
Enter
The <Enter> key allows you to display or change the setup option listed for a
particular setup item. The <Enter> key can also allow you to display the
setup sub- screens.
4.3 Main Menu
When you first enter the setup utility, you will enter the Main setup screen. You can always
return to the Main setup screen by selecting the Main tab. System Time/Date can be set up as
described below. The Main BIOS setup screen is shown below.
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AMI BIOS Setup Utility 29
BIOS Information
Display the auto-detected BIOS information.
System Date/Time
Use this option to change the system time and date. Highlight System Time or System Date
using the <Arrow> keys. Enter new values through the keyboard. Press the <Tab> key or the
<Arrow> keys to move between fields. The date must be entered in MM/DD/YY format. The
time is entered in HH:MM:SS format.
Access Level
Display the access level of current user.
4.4 Advanced Menu
The Advanced menu also allows users to set configuration of the CPU and other system
devices. You can select any of the items in the left frame of the screen to go to the sub menus:
► ACPI Settings
► Serial Port
► Hardware Monitor
► RTC Wake Settings
► Serial Port Console Redirection
► CPU Configuration
► IDE Configuration
► USB Configuration
For items marked with “”, please press <Enter> for more options.
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SBC87842 Single Board Computer
30 AMI BIOS Setup Utility
ACPI Settings
ACPI Sleep State
When the suspend button is pressed, the Advanced Configuration and Power Interface
(ACPI) sleep state is S3 (Suspend to RAM).
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SBC87842 Single Board Computer
AMI BIOS Setup Utility 31
Serial Port
You can use this screen to select options for the Serial Port Configuration, and change the
value of the selected option. A description of the selected item appears on the right side of
the screen. For items marked with “”, please press <Enter> for more options.
Serial Port 1~4 (COM1~4)
Use these items to set parameters related to serial port 1~4.
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SBC87842 Single Board Computer
32 AMI BIOS Setup Utility
Serial Port 1 (COM1)
Serial Port
Enable or disable serial port 1. The optimal setting for base I/O address is 3F8h and for
interrupt request address is IRQ4.
COM Port Type
These are settings for RS-232/422/485 mode. The default setting for all serial ports is
RS-232. The COM_TERM option appears only if RS-422 or RS-485 mode is selected, see
images below. Use COM_TERM to enable or disable internal 120Ω terminator.
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AMI BIOS Setup Utility 33
Hardware Monitor
This screen monitors hardware health status.
This screen displays the temperature of system and CPU and system voltages (VCORE,
VBAT, +5.0V, VSB3 and VCC3V).
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SBC87842 Single Board Computer
34 AMI BIOS Setup Utility
RTC Wake Settings
This screen allows user to enable system to wake from S5 using RTC alarm.
Wake system from S5
Enable or disable system wake on alarm event. The default is Disabled. It allows you to
wake up the system in a certain time. Select Fixed Time to set the system to wake on the
specified time, see image below. Use <> <> to switch among the items: Hour, Minute
and Second, and type the value in the selected item as you wish. For example, if you want
the system to boot up automatically at 14:25:26, then you should enter 14, 25, and 26 from
top to bottom.
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SBC87842 Single Board Computer
AMI BIOS Setup Utility 35
Serial Port Console Redirection
You can use this screen to select options for Serial Port Console Redirection, and change
the value of the selected option. A description of the selected item appears on the right
side of the screen. For items marked with “”, please press <Enter> for more options.
COM1 Console Redirection
Enable or disable console redirection. Note that only COM1 supports this feature.
Console Redirection Settings
When enabled, the host computer is allowed to remotely manage the computer with
SBC87842.
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SBC87842 Single Board Computer
36 AMI BIOS Setup Utility
You can use this screen to further change parameters for console redirection settings.
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SBC87842 Single Board Computer
AMI BIOS Setup Utility 37
CPU Configuration
This screen shows the CPU information, and you can change the value of the selected
option.
Socket 0 CPU Information
This item is for CPU information.
Socket 0 CPU Information
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SBC87842 Single Board Computer
38 AMI BIOS Setup Utility
IDE Configuration
In this configuration menu, you can see the currently installed hardware in the SATA ports.
During system boot up, the BIOS automatically detects the presence of SATA devices.
CF/mSATA
Select CompactFlashTM or mSATA support.
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SBC87842 Single Board Computer
AMI BIOS Setup Utility 39
USB Configuration
USB Devices
Display all detected USB devices.
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SBC87842 Single Board Computer
40 AMI BIOS Setup Utility
4.5 Chipset Menu
The Chipset menu allows users to change the advanced chipset settings. You can select any
of the items in the left frame of the screen to go to the sub menus:
► North Bridge
For items marked with “”, please press <Enter> for more options.
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North Bridge
This screen shows system memory information.
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42 AMI BIOS Setup Utility
4.6 Security Menu
The Security menu allows users to change the security settings for the system.
Administrator Password
This item indicates whether an administrator password has been set (installed or
uninstalled).
User Password
This item indicates whether an user password has been set (installed or uninstalled).
Note
The BIOS default has no password. Create a new password and please remember
it. If you forget the password, then RMA is the only solution.
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AMI BIOS Setup Utility 43
4.7 Boot Menu
The Boot menu allows users to change boot options of the system.
Setup Prompt Timeout
Number of seconds to wait for setup activation key. 65535(0xFFFF) means indefinite
waiting.
Legacy PXE OpROM
Control the execution of UEFI and legacy Preboot eXecution Environment (PXE) OpROM.
The default is Disabled.
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Boot Option Priorities [Boot Option #1, …]
These are settings for boot priority. Specify the boot device priority sequence from the
available devices.
Hard Drive BBS Priorities
Set the order of hard drive boot. This option appears only if at least one device of this
group is detected.
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AMI BIOS Setup Utility 45
4.8 Save & Exit Menu
The Save & Exit menu allows users to load your system configuration with optimal or fail-safe
default values.
Save Changes and Reset
When you have completed the system configuration changes, select this option to leave
Setup and reboot the computer so the new system configuration parameters can take
effect. Select Save Changes and Reset from the Save & Exit menu and press <Enter>.
Select Yes to save changes and reset.
Discard Changes and Reset
Select this option to quit Setup without making any permanent changes to the system
configuration and reboot the computer. Select Discard Changes and Reset from the Save
& Exit menu and press <Enter>. Select Yes to discard changes and reset.
Restore Defaults
It automatically sets all Setup options to a complete set of default settings when you select
this option. Select Restore Defaults from the Save & Exit menu and press <Enter>.
Save as User Defaults
Select this option to save system configuration changes done so far as User Defaults.
Select Save as User Defaults from the Save & Exit menu and press <Enter>.
Restore User Defaults
It automatically sets all Setup options to a complete set of User Defaults when you select
this option. Select Restore User Defaults from the Save & Exit menu and press <Enter>.
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Watchdog Timer 47
Appendix A
Watchdog Timer
A.1 About Watchdog Timer
After the system stops working for a while, it can be auto-reset by the watchdog timer. The
integrated watchdog timer can be set up in the system reset mode by program.
A.2 How to Use Watchdog Timer
The following example enables configuration using debug tool.
Enable WDT
Enable configuration:
O 2E 87 ; Un-lock super I/O
O 2E 87
Select logic device:
O 2E 07
O 2F 08
WDT device enable:
O 2E 30
O 2F 01
Set timer unit:
O 2E F0
O 2F 00 ; (00: Sec; 08:Minute)
Set base timer:
O 2E F1
O 2F 0A ; Set reset time (where 0A (hex) = 10sec)
Disable WDT
Enable configuration:
O 2E 87 ; Un-lock super I/O
O 2E 87
Select logic device:
O 2E 07
O 2F 08
WDT device disable:
O 2E 30
O 2F 00
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Heatspreader (Optional) 49
Appendix B
Heatspreader (Optional)
B.1 Installing Heatspreader
For thermal dissipation, a heatspreader enables the SBC87842’s components to dissipate
heat efficiently. All heat generating components are thermally conducted to the heatspreader in
order to avoid hot spots. Below images illustrate how to install the heatspreader.
1. There is a protective plastic covering on the thermal pads. This must be removed before
the heatspreader can be mounted.
2. Each heatspreader is designed for a specific purpose. The thermal pads on the
heatspreader are designed to make contact with the necessary components on the board.
When mounting the heatspreader you must make sure that the thermal pads on the
heatspreader make complete contact (no space between thermal pad and component)
with the corresponding components on the board. This is especially critical for CPU
board that have higher CPU speeds (for example 1.46GHz or more) to ensure that the
heatspreader acts as a proper thermal interface for cooling solutions.
3. Before installing the heatspreader to the board, please apply thermal grease on the CPU
die. This board has six assembly holes for installing heatspreader plate. Use the six
screws to secure the heatspreader plate to the SBC87842. Be careful not to over-tighten
the screws.
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