Ampro MightyBoard 821 User manual

MightyBoard 821
Single Board Computer
Reference Manual
P/N 5001784B Revision A

Notice Page
NOTICE
No part of this document may be reproduced, transmitted, transcribed, stored in a retrieval system, or
translated into any language or computer language, in any form or by any means, electronic, mechanical,
magnetic, optical, chemical, manual, or otherwise, without the prior written permission of Ampro
Computers, Incorporated.
DISCLAIMER
Ampro Computers, Incorporated makes no representations or warranties with respect to the contents of this
manual or of the associated Ampro products, and specifically disclaims any implied warranties of
merchantability or fitness for any particular purpose. Ampro shall under no circumstances be liable for
incidental or consequential damages or related expenses resulting from the use of this product, even if it has
been notified of the possibility of such damages. Ampro reserves the right to revise this publication from
time to time without obligation to notify any person of such revisions. If errors are found, please contact
Ampro at the address listed below on the Notice page of this document.
Audience
This manual provides reference only for computer design engineers, including but not limited to hardware
and software designers and applications engineers. Ampro Computers, Inc. assumes you are qualified to
design and implement prototype computer equipment.
ii Reference Manual MightyBoard 821
TRADEMARKS
Ampro and the Ampro logo are registered trademarks, and CoreModule, Little Board, LittleBoard,
MightyBoard, MightySystem, MiniModule, ReadyBoard, ReadyBox, ReadyPanel, ReadySystem,
RuffSystem are trademarks of Ampro Computers, Inc. All other marks are the property of their respective
companies.
REVISION HISTORY
Ampro Computers, Incorporated
5215 Hellyer Avenue
San Jose, CA 95138-1007
Tel. [phone]
Fax [phone]
www.ampro.com
© Copyright 2007, 2008 Ampro Computers, Incorporated
Revision Reason for Change Date
A, A Initial Release Dec/06
A, B Correction to move pin 1 on J21 Feb/07
A, C Removed reference to Design Library in
Mechanical Specifications
Dec/07
B, A Removed TV-Out; added LAN LED
jumper pins; corrected block diagram;
added reference to Design Library back
into Mechanical Specification
Aug/08

MightyBoard 821 Reference Manual iii
Contents
Chapter 1 About This Manual ....................................................................................................1
Purpose of this Manual ....................................................................................................................1
References ......................................................................................................................................1
Chapter 2 Product Overview......................................................................................................3
MightyBoard Architecture.................................................................................................................3
Product Description..........................................................................................................................4
Board Features ..........................................................................................................................4
Block Diagram ............................................................................................................................7
Major Components (ICs).............................................................................................................7
Connector and Header Definitions..............................................................................................9
Additional Components.............................................................................................................10
Jumper Definitions ....................................................................................................................11
Specifications.................................................................................................................................11
Power Specifications ................................................................................................................11
Environmental Specifications....................................................................................................12
Thermal/Cooling Requirements ................................................................................................12
Physical Specifications .............................................................................................................13
Mechanical Specifications ........................................................................................................13
Chapter 3 Hardware .................................................................................................................15
Overview ........................................................................................................................................15
Interrupt Channel Assignments ................................................................................................16
Memory Map ............................................................................................................................16
I/O Address Map ......................................................................................................................17
Serial Interfaces ............................................................................................................................18
Keyboard/Mouse Interfaces ...........................................................................................................20
Keyboard Interface ...................................................................................................................20
Mouse Interface ........................................................................................................................21
USB Interfaces...............................................................................................................................21
USB 2.0 Support.......................................................................................................................21
Legacy USB Support ...............................................................................................................21
USB4 and USB5 .......................................................................................................................21
Audio Interface ..............................................................................................................................22
Video Interfaces .............................................................................................................................22
LVDS Interface ........................................................................................................................23
Utility Interface ..............................................................................................................................24
External Power-On Switch........................................................................................................24
External Reset Switch...............................................................................................................24
External Speaker (Beep) .........................................................................................................24
External Power-On LED ...........................................................................................................24
External IDE Activity LED .........................................................................................................24
Miscellaneous ................................................................................................................................25
Real Time Clock (RTC) ............................................................................................................25
External Battery (BT1) ..............................................................................................................25
Temperature Monitoring ..........................................................................................................25
User GPIO Signals (J8) ............................................................................................................25
Ethernet External LED ..............................................................................................................26
Serial Console ..........................................................................................................................26

Contents
iv Reference Manual MightyBoard 821
Infrared (IrDA) Port .................................................................................................................. 26
Watchdog Timer....................................................................................................................... 27
Power Interfaces .......................................................................................................................... 27
ATX Power Supply Interface ................................................................................................... 27
Optional CPU Fan .................................................................................................................... 28
Optional System Fan ............................................................................................................... 28
Power and Sleep States................................................................................................................ 28
Power-On Switch .................................................................................................................... 28
Sleep States (ACPI) ................................................................................................................. 29
Chapter 4 BIOS Setup .............................................................................................................. 31
Introduction.................................................................................................................................... 31
Entering BIOS Setup (VGA Display) ........................................................................................ 31
Entering BIOS Setup (Remote Access) .................................................................................. 31
Logo screen .................................................................................................................................. 32
Logo Screen Image Requirements .......................................................................................... 32
Appendix A Technical Support .................................................................................................. 33
List of Figures
Figure 2-1. MightyBoard and ATX Style Boards Compared ...................................................... 3
Figure 2-2. Functional Block Diagram ....................................................................................... 7
Figure 2-3. Component Locations ............................................................................................ 8
Figure 2-4. Connector and Header Locations ......................................................................... 10
Figure 2-5. Back Panel Overview ............................................................................................ 13
Figure 3-1. RS485 Serial Port Implementation ........................................................................ 18
List of Tables
Table 2-1. Major Component Descriptions and Functions ....................................................... 8
Table 2-2. Connector and Header Descriptions ....................................................................... 9
Table 2-3. Additional Component Descriptions ...................................................................... 10
Table 2-4. Jumper Settings .................................................................................................... 11
Table 2-5. System Power Requirements (1.5 GHz CPU)....................................................... 11
Table 2-6. System Power Requirements (2.0 GHz CPU)....................................................... 12
Table 2-7. Environmental Requirements ................................................................................ 12
Table 2-8. Weight and Footprint Dimensions ......................................................................... 13
Table 3-1. Interrupt Channel Assignments ............................................................................. 16
Table 3-2. Memory Map ......................................................................................................... 17
Table 3-3. I/O Address Map ................................................................................................... 17
Table 3-4. Serial 2 (COM2) Interface Pin/Signal Descriptions (J6) ........................................ 19
Table 3-5. Serial 3 and 4 (COM3 and COM4) Interface Pin/Signal Descriptions (J15).......... 19
Table 3-6. USB Ports 4 & 5 Interface Pin/Signal Descriptions (J21) ...................................... 21
Table 3-7. LVDS Interface Pin/Signal Descriptions (J2) ......................................................... 23
Table 3-8. Utility Interface Pin/Signal Descriptions (J17) ....................................................... 24
Table 3-9. User GPIO Signals Pin/Signal Descriptions (J10)................................................. 25
Table 3-10. Ethernet External LED Pin/Signal Descriptions (JP6) ........................................... 26
Table 3-11. Infrared (IrDA) Interface Pin/Signal Descriptions (J7) ........................................... 26
Table 3-12. ATX Power Supply Interface Pin/Signal Descriptions (J2) .................................... 27
Table 3-13. Optional CPU Fan Interface Pin/Signal Descriptions (J12) ................................... 28
Table 3-14. Optional System Fan Interface Pin/Signal Descriptions (J22)............................... 28
Table A-1. Technical Support Contact Information ................................................................. 33

MightyBoard 821 Reference Manual 1
Chapter 1 About This Manual
Purpose of this Manual
This manual is for designers of systems based on the MightyBoard 821™ single board computer (SBC). The
information in this manual helps designers create embedded systems based on specific design requirements.
Information provided in this reference manual includes:
•MightyBoard 821 Specifications
•Environmental requirements
•Major integrated circuits (chips) and features implemented
•MightyBoard 821 connector/pin numbers and definitions
•BIOS Setup information
Information not provided in this reference manual includes:
•Detailed chip specifications
•Internal component operation
•Internal registers or signal operations
•Bus or signal timing for industry standard busses and signals
References
The following list of references may be helpful for you to complete your design successfully. Some of this
material is also available on the Ampro web site in the InfoCenter. The InfoCenter was created for
embedded system developers to share Ampro’s knowledge, insight, and expertise.
Specifications
•PCI Express Compliant Specifications
For the latest revision of the PCI Express specifications, contact the PCI Special Interest Group
Office at:
Web site: http://www.pcisig.com
•Audio CODEC 1997 Standard, including all revisions
For latest version of the Audio (AC'97) standard developed by Intel Corporation, refer to:
Web site: http://www.intel.com/design/chipsets/audio
Chip specifications used on the MightyBoard 821:
•Intel Corporation and the Pentium®M or Celeron®M CPUs, and the chips 915GM and 82801FB
ICH6-M, used for the Memory Hub (Northbridge/Video controller) and I/O Hub (Southbridge)
respectively.
Web site: http://www.intel.com
•Nuvoton Technology, Corp. and the W83627HF chip used for the Super I/O controller
Web site: http://www.nuvoton-usa.com/products/winbond_products/pdfs/PCIC/W83627HF_HGb.pdf
•FinTek and the F81216D chip used for the Secondary I/O (LPC UART) controller (48-pin)
Web site: http://www.fintek.com.tw/eng/

Chapter 1 About This Manual
2 Reference Manual MightyBoard 821
•Intel Corporation and the Gigabit Ethernet PCI Express 82573V, used for the Gigabit Ethernet
controller.
Web site: http://www.intel.com/design/network/products/lan/controllers/82573.htm
NOTE If you are unable to locate the datasheets using the links provided, go to the
manufacturer’s web site where you should be able to perform a search using
the chip datasheet number or name listed, including the extension such as
htm or pdf.

MightyBoard 821 Reference Manual 3
Chapter 2 Product Overview
This introduction presents general information about the Mini-ITX form factor and the MightyBoard 821
single board computer (SBC). After reading this chapter you should understand:
•MightyBoard 821 architecture
•MightyBoard 821 features
•Major components
•Connectors
•Specifications
MightyBoard Architecture
Ampro’s MightyBoard™is based on the Mini-ITX form factor, which uses the smallest motherboard size,
measuring a mere 170mm x 170mm (6.7" x 6.7"). The MightyBoard size complies with the ATX mechanical
standard in terms of mounting holes, PCI slot placement, and I/O connector placement. The MightyBoard
can be used in any enclosure, which supports ATX, MicroATX or FlexATX motherboards. Unlike Ampro’s
other SBCs (single board computers), which support the PC/104, PC/104-Plus, and PCI-104 standards, the
MightyBoard provides a single PCI slot for I/O expansion.
The MightyBoard form-factor is small enough for deeply embedded applications, yet large enough to
contain the functions of a complete embedded SBC including CPU, memory, mass storage interfaces,
display controller, serial/parallel ports, today’s advanced operating systems, and other system functions.
This new embedded form factor boasts a highly flexible and adaptable system expansion, allowing easy PCI
board addition of functions such as IEEE 1394 FireWire™, video capture, or wireless networking not
usually contained in embedded motherboards.
This new MightyBoard SBC ensures that embedded system OEMs can standardize their designs and that
embedded computing solutions can be designed into space constrained environments with off-the-shelf
components. The MightyBoard SBC is open to continuing technology advancements, since it is both
processor and I/O independent. It creates opportunity for economies of scale in chassis, power supply, and
peripheral devices.
Figure 2-1. MightyBoard and ATX Style Boards Compared
9.6" x 9.6"
Micro ATX
Flex ATX 7.5" x 9"
Full Size
ATX
Mini-ITX
(MightyBoard)
6.7" x 6.7"
9.6" x 12"
PCI Slot PCI Slot
PCI Slot
PCI Slot
Rear I/O Location

Chapter 2 Product Overview
4 Reference Manual MightyBoard 821
Product Description
The MightyBoard 821 is an exceptionally high integration, high performance, rugged, and high quality
single-board computer, which contains all the component subsystems of an ATX motherboard plus a single
PCI expansion slot. Based on Intel processors (Pentium M or Celeron M), the MightyBoard 821 gives
designers a complete, high performance embedded processor based on the Mini-ITX form factor.
Each MightyBoard 821 incorporates an Intel 915GM chipset (82915GM + 82801FBM) and provides four
serial ports, an EPP/ECP parallel port, six USB 2.0 ports, PS/2 keyboard and mouse interfaces, and one
Ultra DMA 33/66/100 IDE controller supporting two IDE drives, two independent 10/100BaseTX and
1000BaseT Ethernet interfaces, and an audio AC'97 CODEC on the board. The MightyBoard 821 also
supports up to 2GB of SDRAM in a single 184-pin DDR DIMM slot, and an AGP4x equivalent graphics
controller, which provides CRT and LVDS flat panel video interfaces for the most popular LCD panels.
The MightyBoard 821 can be expanded through a single x16 PCI Express (PCIe) bus slot for additional
system functions. This PCIe bus operates at clock speeds up to 100MHz.
Among the many embedded-PC enhancements on the MightyBoard 821 that ensure embedded system
operation and application versatility are a watchdog timer, serial console support, battery-free boot, and
BIOS extensions for OEM boot customization.
The MightyBoard 821 is particularly well suited to either embedded or portable applications and meets the
size, power consumption, temperature range, quality, and reliability demands of embedded system
applications. The MightyBoard 821 requires an ATX power supply or a single +5V power supply.
Board Features
•CPU Features
♦ 2.0GHz Intel Pentium®M 760 or 1.5GHz Celeron®M 370
♦ Front Side Bus (FSB) of 533MHz for the 2.0GHz Pentium, 400MHz for the 1.5GHz Celeron
•Memory
♦ Provides two standard 200-pin DDR2 DIMM slots
♦ Supports two +2.5V DDR2 DIMMs up to 2GB
♦ Supports up to 2GB DDR2 (533MHz) SDRAM
♦ Supports unregistered/unbuffered non-ECC DDR2 RAM
•PCI Express Bus x16 Slot Interface
♦ Provides a single PCIe slot
♦ Supports PCIe bus speed up to 4 GBps, each direction
•Serial ATA Interface (SATA)
♦ Supports two 7-pin SATA ports
♦ Provides 1.5 GB/second data transfer rate
•IDE Interface
♦ Provides one enhanced IDE controller (2 devices)
♦ Provides one 40-pin IDE connector
♦ Supports dual bus master mode
♦ Supports Ultra DMA 33/66/100 modes
♦ Supports ATAPI and DVD peripherals
♦ Supports IDE native and ATA compatibility modes
•Parallel Port

Chapter 2 Product Overview
MightyBoard 821 Reference Manual 5
♦ Provides standard printer port
♦ Supports IEEE standard 1284 protocols of EPP and ECP outputs
♦ Provides bi-directional data lines
♦ Supports 16 byte FIFO for ECP mode
•USB Ports
♦ Provides two root USB hubs
♦ Provides six USB ports
♦ Supports USB bootable devices
♦ Supports USB 2.0 and legacy USB v1.1
♦ Supports over-current fuses on board
♦ Supports over-current detection status on board
•Serial Ports
♦ Provides four buffered serial ports with full handshaking
♦ Provides 16550-equivalent controllers, each with a built-in 16-byte FIFO buffer
♦ Supports RS232 capability on all four ports
♦ Supports full modem capability on three of the four ports
♦ Supports RS485 or RS422 operation on two of the four ports
♦ Supports programmable word length, stop bits, and parity
♦ Supports 16-bit programmable baud-rate generator and an interrupt generator
•Infrared Interface
♦ Provides a five-pin IrDA interface header (J7)
♦ Supports IrDA v1.1
♦ Supports HPSIR and ASKIR infrared modes
•Keyboard/Mouse Interface
♦ Provides a single PS/2 keyboard port
♦ Provides a single PS/2 mouse port
•Audio Interface
♦ Provides a single three-pin audio stack for MIC In, Line In, and Line Out
♦ Supports AC'97 standard
♦ AC'97 CODEC on board
•Ethernet Interface
♦ Supports two fully independent ethernet ports
♦ Integrated LEDs on each port (Link/Activity and Speed)
♦ Provides PCIe interface using Intel 82573V controller
♦ Supports IEEE 802.11 10BaseT/100BaseTX/1000BaseT compatible physical layer
♦ Supports auto-negotiation for speed, duplex mode, and flow control
♦ Supports full duplex or half-duplex mode
• Full-duplex mode supports transmit and receive frames simultaneously
• Supports IEEE 802.11 flow control in full duplex mode

Chapter 2 Product Overview
6 Reference Manual MightyBoard 821
• Half-duplex mode supports enhanced proprietary collision reduction mode
♦ Supports LAN Boot (See Appendix B)
•Video Interfaces (CRT/LVDS)
♦ Support CRT (2048-1536) with 64MB BIOS dependent UMA (Unified Memory Architecture)
♦ Integrated graphics controller performance
♦ LVDS outputs (1 or 2 channel, four differential signals 3-bits + clock)
•Miscellaneous
♦ Provides real-time clock (RTC) with replaceable battery
♦ Supports battery-free boot
♦ Provides external battery connection for RTC operation
♦ Provides user GPIO interface header
♦ Thermal and voltage monitoring
♦ Provides connector for optional CPU fan
♦ Supports a customizable Logo Screen
♦ Supports Serial Console
♦ Provides Watchdog Timer

Chapter 2 Product Overview
MightyBoard 821 Reference Manual 7
Block Diagram
Figure 2-2 shows the functional components of the MightyBoard 821.
Figure 2-2. Functional Block Diagram
Major Components (ICs)
Table 2-1 lists the major integrated circuits (chips), including a brief description of each, on the
MightyBoard 821 and Figure 2-3 shows the location of the major chips.
MB821Blkdiagm_b
Intel
Pentium M
or Celeron M
CPU
DDR2
SODIMM
Memory Bus
Magnetics-
RJ45
Keyboard/
Mouse
SMBus
PCIe Bus
Connector
PCIe
x16 Bus
PCIe
x1 Bus
IrDA 1.1
Parallel
AC’97
CODEC
COM3 COM4
USB Port 2
USB Port 1
USB Port 0
USB 2.0
Super I/O
W83627HF
COM1 COM2
AC’97 Link
Clock
Temp
512kB
ROM
BIOS
Ethernet
Controller(2)
82573V
CRT VGA
LVDS LCD
Magnetics-
RJ45
GPIO (User Defined)
Memory Hub
82915GM
(Northbridge)
I/O Hub
82801FB
(Southbridge)
SATA
IDE
PATA
SATA
IDE Devices,
(HDDs, ) CD-ROM, etc.
RS232/RS422/RS485
LPC Bus
LPC I/O
(Secondary)
F81216D
CPU Fan
USB Port 3
USB Port 4
USB Port 5

Chapter 2 Product Overview
8 Reference Manual MightyBoard 821
Figure 2-3. Component Locations
Table 2-1. Major Component Descriptions and Functions
Chip Type Mfg. Model Description Function
CPU (U10) Intel Pentium M,
Celeron M
2.0GHz, 1.5GHz CPUs Embedded
CPU
Memory Hub (U7) Intel 915GM Memory and Video functions Memory
and Video
I/O Hub (U3) Intel 82801FB Provides some of the I/O functions (HDD,
Audio, USB, LAN, PCI)
I/O
Functions
Super I/O (U5) Nuvoton W83627HF Provides most of remaining I/O functions
(FDD, COM1/2, KB, MS, LPT, Fan,
IrDA)
I/O
Functions
LPC (I/O) UART
Controller (U13)
FinTech F81216D LPC controller for Serial Ports 3 & 4
(COM 3 & 4)
UART
(I/O)
Controller
Audio '97 CODEC
(U15)
Realtek ALC202A Audio '97 CODEC for audio In/Out
signals
Audio
In/Out
Ethernet
Controllers
(U8, U11)
Intel 82573V Ethernet – These chips provide two
independent 10/100BaseT and 1000BaseT
network channels respectively
Ethernet
Functions
U8
U11
U10
U5
U7
U3
U15
U13

Chapter 2 Product Overview
MightyBoard 821 Reference Manual 9
Connector and Header Definitions
Table 2-2 describes the connectors and headers shown in Figure 2-4. All I/O connectors and headers use
2.54mm (0.1") pin spacing (pitch) unless otherwise indicated.
Table 2-2. Connector and Header Descriptions
Jack # Signal Description
BT1 Battery 2-pin, 1.25mm external battery connector
DIMM1 DDR2 Memory 1 240-pin socket for DDR2 RAM DIMM
DIMM2 DDR2 Memory 2 240-pin socket for DDR2 RAM DIMM
J1 A/B Keyboard/Mouse 6-pin standard PS/2 connectors for keyboard (purple) and mouse
(green)
J2 ATX PWR In 20-pin, 4.2mm for ATX power in connector
J3 Serial 1 (COM1) 9-pin, 2.77mm connector for serial port 1 (COM1)
J4 Parallel 25-pin connector for printer port (LPT 1)
J5 Video (CRT) 15-pin connector for output to a CRT type monitor
J6 Serial 2 (COM2) 10-pin, 2.0mm header for serial port 2 (COM2)
JP6 Ethernet External
LED
8-pin header for Ethernet activity signals on external LEDs
J7 Infrared (IrDA) 5-pin header for Infrared (IrDA)
J8 GPIO 10-pin, 2.0mm header for general purpose I/O
J9 Video (LVDS) 30-pin, 2.0mm header for LVDS type video displays
J10 DNP Do not populate
J11A Ethernet 1
(LAN1)
8-pin RJ45 connector on Gigabit Ethernet port 1
J11B/C USB 0 & 1 8-pin USB jack provides USB0 and USB1 ports
J12 CPU Fan 3-pin header for fan, +12V, tachometer, ground
J13A Ethernet 2
(LAN2)
8-pin RJ45 connector on Gigabit Ethernet port 2
J13B/C USB 2 & 3 8-pin USB jack provides USB2 and USB3 ports
J14 Audio In/Out 14-pin jack for 3.5 mm MIC In, Line Out, Line In connectors
J15 Serial 3 & 4 20-pin, 2.0mm header for serial ports 3 and 4 (COM3 & COM4)
J16 PCI Express 164-pin, 2.0mm slot for PCI Express
J17 Utility 16-pin connector for PWR LED, IDE activity LED, Power switch,
reset switch, PC speaker (Beep)
J18 IDE 40-pin header for the IDE interface
J19 SATA 1 7-pin Serial ATA connector
J20 SATA 0 7-pin Serial ATA connector
J21 USB 4 & 5 10-pin, 2.0mm header for USB4 and USB5 ports
J22 System Fan 3-pin header for fan, +12V, tachometer, ground

Chapter 2 Product Overview
10 Reference Manual MightyBoard 821
Figure 2-4. Connector and Header Locations
Additional Components
Fuses F1 and F2, in Table 2-3, are shown in Figure 2-4. Fuses F3 and F4 can be found on the back of the
board.
NOTE Pin-1 is shown as a black pin (square or round) in all connectors and jumpers in
all illustrations.
Table 2-3. Additional Component Descriptions
Component Description
F1 (1.6A) Auto Reset Overcurrent Fuse for the USB 4 & 5 (J21)
F2 (1.6A) Auto Reset Overcurrent Fuse for the USB 0 & 1 (J11)
F3 (1.1A) Auto Reset Overcurrent Fuse for the Keyboard/Mouse (J1)
F4 (1.6A) Auto Reset Overcurrent Fuse for the USB 2 & 3 (J13)
J4
J3
J5
J20
J22 BT1
J1
JP1
F2
F1
DIMM2 DIMM1
J16
J15
JP6
J21
J17
J18
J2
J6
J8
J9

Chapter 2 Product Overview
MightyBoard 821 Reference Manual 11
Jumper Definitions
Table 2-4 describes the jumpers shown in Figure 2-4 on page 10.
Table 2-4. Jumper Settings
Note: *The jumper or shunt may be stored by connecting it to one of the pins for safe keeping.
Specifications
Power Specifications
Tables 2-5 and 2-6 list the power requirements for the MightyBoard 821 with 1.5 and 2.0 GHz CPUs.
Operating configurations:
•In-rush operating configuration includes 512MB DDR RAM, ATX power, CRT monitor, two SATA
HDDs and one IDE HDD each with WinXP Pro, keyboard and mouse.
•Idle operating configuration includes the same items as the in-rush configuration.
•BIT* = Burn-In-Test. Operating configuration includes Idle configuration as well as one serial port with
loop-back, one parallel port with loop-back, two Ethernet connections, and four external USB flash
drives.
Jumper # Installed Removed/Installed
JP1 – CMOS Normal/Clear Normal (pins 1-2) Default Clear (pins 2-3)
JP2 – CPU Voltage Select 1.5V/533 FSB CPU (pins 1-2) 1.8V/400 FSB CPU (removed)
JP3 – Serial 3 (COM3) RS-485
Termination
Termination (pins 1-2) No Termination (removed)
*Default
JP3 – Serial 4 (COM4) RS-485
Termination
Termination (pins 3-4) No Termination (removed)
*Default
JP4 – LVDS Voltage Select Enable +3.3V (pins 1-2) Default Enable +5V (pins 2-3)
JP5 – Inverter Voltage Select +5V (pins 1-2) +12V (pins 2-3)
Table 2-5. System Power Requirements (1.5 GHz CPU)
Parameter +12.0VDC
In-rush Current
(Typical)
Max: 8.00A (96.00W)
Min: 0.28A (3.36W)
Idle 1.20A (14.38W)
BIT* Current
(Typical)
1.54A (18.47W)

Chapter 2 Product Overview
12 Reference Manual MightyBoard 821
Operating configurations:
•In-rush operating configuration includes 512MB DDR RAM, ATX power, CRT monitor, two SATA
HDDs and one IDE HDD each with WinXP Pro, keyboard and mouse.
•Idle operating configuration includes the same items as the in-rush configuration.
•BIT* = Burn-In-Test. Operating configuration includes Idle configuration as well as one serial loop-
back, one parallel port with loop-back, two Ethernet connections, and four external USB flash drives.
Environmental Specifications
Table 2-7 provides the most efficient operating and storage condition ranges required for this board.
Thermal/Cooling Requirements
The CPU, Memory Hub (Northbridge), I/O Hub (Southbridge), and voltage regulators are the sources of
heat on the board. The MightyBoard 821 is designed to operate at its maximum CPU speed of 2.0GHz or
1.5GHz. Both CPU versions (Celeron M or Pentium M) and the Memory Hub (Northbridge) require a
heatsink with a fan.
Table 2-6. System Power Requirements (2.0 GHz CPU)
Parameter +12.0VDC
In-rush Current
(Typical)
Max: 5.84A (70.08W)
Min: 0.20A (2.40W)
Idle 0.97A (11.65W)
BIT* Current
(Typical)
1.33A (16.00W)
Table 2-7. Environmental Requirements
Parameter 1.5GHz Celeron M Conditions 2.0GHz Pentium M Conditions
Temperature
Operating 0° to +60°C
(+32° to +140°F)
0° to +60°C
(+32° to +140°F)
Storage –20° to +75°C
(–4° to +167°F)
–20° to +75°C
(–4° to +167°F)
Humidity
Operating 5% to 90%
relative humidity,
non-condensing
5% to 90%
relative humidity,
non-condensing
Non-operating 5% to 95%
relative humidity,
non-condensing
5% to 95%
relative humidity,
non-condensing

Chapter 2 Product Overview
MightyBoard 821 Reference Manual 13
Physical Specifications
Table 2-8 shows the physical dimensions of the board, and Figure 2-5 shows the mounting dimensions and
connector locations.
Mechanical Specifications
Figure 2-5 shows the side view of the MightyBoard 821 with the mechanical mounting dimensions. Refer
also to the MightyBoard Design Library on the MightyBoard 821 Support Software DVD for more detailed
dimensions.
Figure 2-5. Back Panel Overview
Table 2-8. Weight and Footprint Dimensions
Item Dimension NOTE Overall height is measured from the
upper board surface to the highest
permanent component (Audio 3-in-1
stack) on the upper board surface. This
measurement does not include the
various heatsinks or DIMM sizes
available for this board. The DIMM or
heatsinks could increase this dimension.
Weight 0.385kg. (0.85lbs.)
Height (overall) 38.50mm (1.51")
Width 170mm (6.69")
Length 170mm (6.69")
Thickness 1.57mm (0.062")
Back Panel I/Os
Line In (Blue)
Line Out (Green)
MIC In (Pink)
Mouse (Green)
Keyboard (Purple)
Back Panel Bezel
MB821SideVw_b

Chapter 2 Product Overview
14 Reference Manual MightyBoard 821

MightyBoard 821 Reference Manual 15
Chapter 3 Hardware
Overview
This chapter discusses the chips and features of the connectors in the following order:
•Interrupt Channel Assignments
•Memory Map
•I/O Address Map
•Serial Interfaces
•USB Interfaces
♦ USB 2.0 Support
♦ Legacy USB Support
•Video Interfaces
♦ LVDS Interface (J2)
•Infrared (IrDA)
•Utility Interface
♦ External Power-On Switch
♦ External Reset Switch
♦ External Speaker (Beep)
♦ External Power-On LED
♦ External IDE Activity LED
•Miscellaneous
♦ Real Time Clock (RTC)
♦ External Battery (BT1)
♦ Temperature Monitoring
♦ User GPIO Signals
♦ Ethernet External LED
♦ Serial Console
• Serial Console Setup
♦ Watchdog timer
•Power and Sleep States
♦ Power-On Switch
♦ Sleep States (ACPI)
NOTE Ampro Computers, Inc. supports only the features/options tested and listed in
this manual. The main integrated circuits (chips) used in the MightyBoard 821
may provide more features or options than are listed for the MightyBoard 821,
but some of these chip features/options are not supported on the board and may
not function as specified in the chip documentation.

Chapter 3 Hardware
16 Reference Manual MightyBoard 821
Interrupt Channel Assignments
The interrupt channel assignments are shown in Table 3-1.
Legend: D = Default, O = Optional
Memory Map
The following table provides the common PC/AT memory allocations. These are DOS-level addresses. The
OS typically hides these physical addresses by way of memory management. Memory below 000500h is
used by the BIOS.
Table 3-1. Interrupt Channel Assignments
Device vs IRQ No. 01234567891011 12 13 14 15
Timer D
Keyboard D
Secondary Cascade D
COM1 O D
COM2 D O
COM3 O D
COM4 D O
Parallel O D
RTC D
IDE DO
Math Coprocessor D
PS/2 Mouse D
PCI INTA Automatically Assigned
PCI INTB Automatically Assigned
PCI INTC Automatically Assigned
PCI INTD Automatically Assigned
PCI INTE Automatically Assigned
PCI INTF Automatically Assigned
PCI INTH Automatically Assigned
Sound Blaster D O O O
USB Automatically Assigned
VGA Automatically Assigned
Ethernet Automatically Assigned
NOTE The IRQs for the Ethernet, Video, and Internal LPC bus are automatically
assigned by the BIOS Plug and Play logic. Local IRQs assigned during
initialization can not be used by external devices.