Ampro Corporation Littleboard 550 User Manual

LittleBoard™ 550

Single Board Computer

Reference Manual

P/N 5001740A 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.

TRADEMARKS

Ampro and the Ampro logo are registered trademarks, and CoreModule, EnCore, Little Board,
LittleBoard, MightyBoard, MiniModule, ReadyBoard, ReadyBox, and ReadySystem are trademarks of
Ampro Computers, Inc. All other marks are the property of their respective companies.

REVISION HISTORY

Revision Reason for Change Date

A Initial Release Jan/05

Ampro Computers, Incorporated
5215 Hellyer Avenue
San Jose, CA 95138-1007
Tel. [phone]
Fax [phone]
www.ampro.com

© Copyright 2005, Ampro Computers, Incorporated

Audience Assumptions

This reference manual is for the person who designs computer related equipment, including but not
limited to hardware and software design and implementation of the same. Ampro Computers, Inc.
assumes you are qualified in designing and implementing your hardware designs and its related software
into your prototype computer equipment.

ii Reference Manual LittleBoard 550

Contents

Chapter 1 About This Manual.........................................................................................................1

Purpose of this Manual.......................................................................................................................1

Reference Material .............................................................................................................................1

Related Ampro Products ....................................................................................................................2

Chapter 2 Product Overview...........................................................................................................5

EBX Architecture ................................................................................................................................5

Product Description ............................................................................................................................6

Board Features...............................................................................................................................7

Block Diagram..............................................................................................................................10

Major Integrated Circuits (ICs) .....................................................................................................11

Connector Definitions...................................................................................................................12

Additional Components................................................................................................................12

Jumper Definitions........................................................................................................................14

LED Definitions.............................................................................................................................14

Specifications....................................................................................................................................16

Physical Specifications.................................................................................................................16

Mechanical Specifications............................................................................................................17

Power Specifications....................................................................................................................19

Environmental Specifications.......................................................................................................19

Thermal/Cooling Requirements....................................................................................................19

Chapter 3 Hardware.......................................................................................................................21

Overview .......................................................................................................................................21

CPU (U1) .......................................................................................................................................22

Memory .......................................................................................................................................22

SDRAM Memory (DIMM1) ...........................................................................................................22

Flash Memory (U17).....................................................................................................................22

Serial EEPROM (SEEP)...............................................................................................................22

Interrupt Channel Assignments....................................................................................................23

Memory Map.................................................................................................................................23

I/O Address Map ..........................................................................................................................24

PC/104-Plus Interface (J21).............................................................................................................25

PC/104 Interface (J1A,B,C,D) ..........................................................................................................30

IDE Interface (J12, J17)....................................................................................................................35

CompactFlash Adapter (J23)............................................................................................................39

Floppy Drive Interface (J14)...................................................................................................

Parallel Port Interface (J15)..............................................................................................................42

Serial Interfaces (J11, J13)...............................................................................................................43

Utility Interfaces................................................................................................................................47

Utility 1 Interface (J16)......................................................................................................................47

Keyboard Interface.......................................................................................................................47

External Battery............................................................................................................................47

Reset Switch ................................................................................................................................47

PC Speaker..................................................................................................................................47

Utility 2 Interface (J24)......................................................................................................................48

Mouse Interface............................................................................................................................48

System Management Bus (SMBus).............................................................................................48

..........41

LittleBoard 550 Reference Manual iii

Contents

USB Signals (USB0 and USB1) .................................................................................................. 49

Utility 3 Interface (J18)..................................................................................................................... 51

USB Signals (USB2 and USB3) .................................................................................................. 51

Ethernet Interfaces (J7, J32)............................................................................................................52

Audio Interface (J28)........................................................................................................................53

Video Interfaces (J3, J4, J5, J31) .................................................................................................... 55

CRT Interface...............................................................................................................................55

LCD Interface 1............................................................................................................................56

LCD Interface 2............................................................................................................................57

LVDS Interface.............................................................................................................................58

Miscellaneous .................................................................................................................................. 59

Real Time Clock (RTC)................................................................................................................59

Temperature Monitoring...............................................................................................................59

Oops! Jumper (BIOS Recovery)..................................................................................................59

Serial Console.............................................................................................................................. 59

Watchdog Timer...........................................................................................................................60

Power Interface (J10).......................................................................................................................61

Power Monitor..............................................................................................................................61

CPU Fan ......................................................................................................................................61

Chapter 4 BIOS Setup...................................................................................................................63

Introduction ...................................................................................................................................... 63

Accessing BIOS Setup (VGA Display)......................................................................................... 63

Accessing BIOS Setup (Serial Console)...................................................................................... 64

BIOS Menus..................................................................................................................................... 65

BIOS Setup Opening Screen.......................................................................................................65

BIOS Configuration Screen ......................................................................................................... 66

Drive Configurations and Boot Options ....................................................................................... 66

User Interface Options................................................................................................................. 69

Memory Control Options.............................................................................................................. 70

Power Management and Advanced User Options ...................................................................... 71

Video, Flat Panel, and Audio Options..........................................................................................74

PCI, Plug n' Play, and Interrupt Assignments.............................................................................. 75

Splash Screen Customization.......................................................................................................... 79

Splash Screen Image Requirements........................................................................................... 79

Converting the Splash Screen File.............................................................................................. 79

Appendix A Technical Support ......................................................................................................81

Appendix B Connector Part Numbers............................................................................................ 83

Appendix C LAN Boot Option..........................................................................................................85

Introduction ...................................................................................................................................... 85

PXE Boot Agent BIOS Setup........................................................................................................... 86

Accessing PXE Boot Agent BIOS Setup .....................................................................................86

PXE Boot Agent Setup Screen....................................................................................................87

Index .......................................................................................................................................89

List of Figures

Figure 2-1. Stacking PC/104 Modules with the LittleBoard 550 ....................................................... 6

Figure 2-2. LittleBoard 550 Functional Block Diagram................................................................... 10

Figure 2-3. LittleBoard 550 Component Location (Top view)......................................................... 11

iv Reference Manual LittleBoard 550

Contents

Figure 2-4. Connector and Fuse Locations (Top view)...................................................................13

Figure 2-5. Jumpers Locations (Top view)......................................................................................15

Figure 2-6. Component and Fuses Locations (Bottom view)..........................................................16

Figure 2-7. LittleBoard 550 Dimensions (Top view, #1)..................................................................17

Figure 2-8. LittleBoard 550 Dimensions (Top view, #2)..................................................................18

Figure 3-1. RS485 Serial Port Implementation................................................................................43

Figure 3-2. Oops! Jumper Connection ............................................................................................59

Figure 3-3. Hot Cable Jumper.........................................................................................................60

Figure 4-1. Opening BIOS Screen...................................................................................................65

Figure 4-2. Modifying Setup Parameters Screen............................................................................66

Figure B-1. PXE Agent Boot Setup Screen.....................................................................................87

List of Tables

Table 2-1. Major Integrated Circuit Description and Function.........................................................11

Table 2-2. Connector Descriptions..................................................................................................12

Table 2-3. Additional Component Descriptions...............................................................................12

Table 2-4. Jumper Settings .............................................................................................................14

Table 2-5. Ethernet Port 1 (J7) LED Indicators...............................................................................14

Table 2-6. Ethernet Port 2 (J32) LED Indicators.............................................................................14

Table 2-7. Weight and Footprint Dimensions..................................................................................16

Table 2-8. Power Supply Requirements..........................................................................................19

Table 2-9. Environmental Requirements.........................................................................................19

Table 3-1. Interrupt Channel Assignments......................................................................................23

Table 3-2. Memory Map ..................................................................................................................24

Table 3-3. I/O Address Map ............................................................................................................24

Table 3-4. PC/104-Plus Pin/Signal Descriptions (J21)....................................................................25

Table 3-5. PC/104 Interface Pin/Signal Descriptions (J1A) ............................................................30

Table 3-6. PC/104 Interface Pin/Signal Descriptions (J1B) ............................................................31

Table 3-7. PC/104 Interface Pin/Signal Descriptions (J1C) ............................................................33

Table 3-8. PC/104 Interface Pin/Signal Descriptions (J1D) ............................................................33

Table 3-9. Primary IDE Interface Pin/Signal Descriptions (J12) .....................................................35

Table 3-10. Secondary IDE Interface Pin/Signal Descriptions (J17)...............................................36

Table 3-11. CompactFlash Interface Pin/Signal Descriptions (J23)................................................39

Table 3-12. Floppy Drive Interface Pin/Signal Descriptions (J14)...................................................41

Table 3-13. Parallel Interface Pin/Signal Descriptions (J15)...........................................................42

Table 3-14. Serial A Interface Pin/Signal Descriptions (J11) ..........................................................44

Table 3-15. Serial B Interface Pin/Signal Descriptions (J13) ..........................................................45

Table 3-16. Utility 1 Interface Pin/Signal Descriptions (J16)...........................................................48

Table 3-17. SMBus Reserved Addresses .......................................................................................49

Table 3-18. Utility 2 Interface Pin/Signal Descriptions (J24)...........................................................50

Table 3-19. Utility 3 Interface Pin/Signal Descriptions (J18)...........................................................51

Table 3-20. Ethernet Port 1 Pin/Signal Descriptions (J7)................................................................52

Table 3-21. Ethernet Port 2 Pin/Signal Descriptions (J32)..............................................................53

Table 3-22. Audio Interface Pin/Signal Descriptions (J28)..............................................................54

Table 3-23. CRT Interface Pin/Signal Descriptions (J5)..................................................................55

Table 3-24. LCD Interface 1 Pin/Signal Descriptions (J3)...............................................................56

Table 3-25. LCD Interface 2 Pin/Signal Descriptions (J4)...............................................................57

Table 3-26. LVDS Interface Pin/Signal Descriptions (J31) .............................................................58

Table 3-27. Power Interface Pin/Signal Descriptions (J10).............................................................61

LittleBoard 550 Reference Manual v

Contents

Table 3-28. CPU Fan (J2)............................................................................................................... 61

Table 4-1. BIOS Setup Menus........................................................................................................64

Table 4-2. Floppy Drive BIOS Settings...........................................................................................67

Table 4-3. LCD Panel Type List......................................................................................................75

Table A-1. USA Technical Support Contact Information ................................................................ 81

Table B-1. Connector and Manufacturers' Part Numbers............................................................... 83

vi Reference Manual LittleBoard 550

Chapter 1 About This Manual

Purpose of this Manual

This manual is for designers of systems based on the LittleBoard™ 550 single board computer (SBC).
This manual contains information that permits designers to create an embedded system based on specific
design requirements.

Information provided in this reference manual includes:

• LittleBoard 550 Specifications

• Environmental requirements

• Major integrated circuits (chips) and features implemented

• LittleBoard 550 connector/pin numbers and definition

• 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

Reference Material

The following list of reference materials may be helpful for you to complete your design successfully.
Most of this reference material is also available on the Ampro web site in the Embedded Design
Resource Center. The Embedded Design Resource Center was created for embedded system developers
to share Ampro’s knowledge, insight, and expertise gained from years of experience.

Specifications

• PC/104 Spec Revision 2.5, November 2003

• PC/104-Plus Spec Revision 2, November 2003

For latest revision of the PC/104 specifications, contact the PC/104 Consortium, at:

Web site: http://www.pc104.org

• PCI 2.3 Compliant Specifications

For latest revision of the PCI specifications, contact the PCI Special Interest Group Office at:

Web site: http://www.pcisig.com

LittleBoard 550 Reference Manual 1

Chapter 1 About this Manual

Chip (integrated circuits) specifications used on the LittleBoard 550:

• VIA Technologies, Inc. the Eden™ ESP processors, and the chips, VT8606 and VT82C686B,

used for the Northbridge/Video controller and Southbridge respectively

Web site: http://www.viatech.com

• Winbond Electronics, Corp. and the W83877TF chip used for the secondary I/O controller

Web site: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/877tf.pdf

• Intel Corporation and the chip, 82551ER, used for the Ethernet controllers

Web site: http://developer.intel.com/design/network/products/82551er_DS

Related Ampro Products

The following items are directly related to successfully using the Ampro product you have just
purchased or plan to purchase. Ampro highly recommends that you purchase and utilize a
LittleBoard 550 QuickStart Kit or Development System.

LittleBoard 550 Support Products

• LittleBoard 550 QuickStart Kit (QSK)

The QuickStart Kit includes the LittleBoard 550, RAM, an I/O interface board, a cable kit,
documentation, and drivers for the unique devices used with Ampro supported operating systems.

• LittleBoard 550 Development System

The Development System is a benchtop system, which provides a “known good” environment for
your development work. The Development System provides an integrated and easy-to-use self­hosted development environment that lets you maximize the benefit of using an off-the-shelf
board as the basis of your embedded system design. You can install ISA bus or PCI bus
expansion boards on the Development System chassis. The Development System is arranged to
make all the components of your system accessible. Refer to the LittleBoard 550 Development
System Users Guide on the LittleBoard 550 Documentation and Support Software (Doc & SW)
CD-ROM for more information.

• LittleBoard 550 Documentation and Support Software CD-ROM

The LittleBoard 550 Documentation and Support Software (Doc & SW) CD-ROM is provided
with the LittleBoard 550. The CD-ROM includes all of the LittleBoard 550 documentation in
PDF format, including this reference manual, the LittleBoard 550 QuickStart Guide, the
LittleBoard 550 Development System Users Guide, software utilities, board support packages,
and drivers.

Other LittleBoard Products

• LittleBoard 700 – This EBX single board computer (SBC) is a highly integrated, high-

performance, rugged, high quality system based on Intel's 933MHz Low Voltage Pentium® III,
650MHz Low Voltage Celeron®, or 400MHz Ultra Low Voltage Celeron processors. In addition
to the standard LittleBoard features (EBX form factor, PC/104 & PC/104-Plus interfaces, +5 volt
power, watchdog timer, serial console, etc.), the LittleBoard 700 supports up to four EIDE Ultra
DMA 33/66/100 IDE drives including a CompactFlash™ socket, two floppy disk drives, one
ECP/EPP parallel port, four RS232/422/485 serial ports, four USB V1.1 ports, two Ethernet
ports, IrDA, AC'97 audio interface, and PS/2 keyboard & serial mouse. It also supports Ampro
BIOS extensions for OEM boot customization, power management features, up to 1GB of
SDRAM in an DIMM slot, up to 32MB UMA of AGP 4X video with built-in LVDS, CRT, and
36-bit TFT support.

2 Reference Manual LittleBoard 550

Chapter 1 About this Manual

• LittleBoard 800 – This EBX single board computer (SBC) is a highly integrated, high­performance, rugged, high quality system based on Intel's 1.4GHz Low Voltage Pentium M 738,

1.0GHz Low Voltage Celeron M, or 600MHz Ultra Low Voltage Celeron M CPUs. In addition
to the standard LittleBoard features (EBX form factor, PC/104 & PC/104-Plus interfaces, +5 volt
power, watchdog timer, serial console, etc.), the LittleBoard 800 supports up to four EIDE Ultra
DMA 33/66/100 IDE drives including a CompactFlash socket, two floppy disk drives, one
ECP/EPP parallel port, four RS232/422/485 serial ports, four USB 2.0 ports, two Ethernet ports
(one Gigabit port), IrDA, AC'97 audio interface, and PS/2 keyboard & serial mouse. It also
supports Ampro BIOS extensions for OEM boot customization, power management features, up
to 1GB of DDR RAM in an DIMM slot, up to 64MB UMA of AGP 4X 128-bit 3D video
interface with built-in dual channel LVDS and CRT support.

Other Ampro Products

• CoreModule™

Family – These complete embedded-PC subsystems on single PC/104 or PC/104­Plus form-factor (3.6x3.8 inches) modules feature 486, VIA Eden ESPs, Celeron®, or Celeron M
CPUs. Each CoreModule includes a full complement of PC core logic functions, plus disk
controllers, and serial and parallel ports. Most modules also include CRT and flat panel graphics
controllers and/or an Ethernet interface. The CoreModules also come with built-in extras to meet
the critical reliability requirements of embedded applications. These include onboard solid state
disk compatibility, watchdog timer, smart power monitor, and Ampro embedded BIOS
extensions.

• MiniModule™ Family – This extensive line of peripheral interface modules compliant with

PC/104 and PC/104-Plus standards can be used with Ampro CoreModule, LittleBoard, and
ReadyBoard single-board computers to configure embedded system solutions. Ampro's highly
reliable MiniModule products currently support USB 2.0, IEEE 1394 (Firewire), Ethernet, PC
Card expansion, analog/data acquisition, additional RS232/RS485 serial ports, and general­purpose I/O (GPIO).

™

• MightyBoard

the Mini-ITX form factor (6.7" x 6.7") and are available with Intel® processors, including
Pentium M. MightyBoard products offer the equivalent functions of a complete laptop or
desktop PC system, including DDR memory, high performance graphics, USB 2.0, Gigabit
Ethernet, plus standard PCI expansion capability in one card slot. Ampro includes configuration
control and embedded BIOS extension such as watchdog timer, battery-free boot, a customizable
splash screen, BIOS recovery, and serial console.

• ReadyBoard
EPIC form factor (4.5”x6.5”) and are available with the VIA Eden™, Intel Pentium® III,
Celeron®, Pentium M and Celeron M processors. ReadyBoard products offer functions
equivalent to a complete laptop or desktop PC system, plus several expansion cards. Ampro
includes configuration control and embedded BIOS extension such as watchdog timer, battery­free boot, a customizable splash screen, BIOS recovery, and serial console.

Family – These low-cost, high-performance single-board computers (SBC) use

™

Family – These low-cost, high-performance single-board computers (SBC) use the

• ETX Family – These high-performance, compact, rugged Computer-on-Module (COM) solutions
use various x86 processors from 300MHz VIA Eden ESP to 1.4GHz Low Voltage Pentium M
738 CPUs in an ETX Revision 2.6 form factor to plug into your custom baseboard. Each ETX
module provides standard peripherals, including dual Ultra/DMA 33/66/100 IDE, floppy drive
interface, PCI bus, ISA bus, serial, parallel, PS/2 keyboard and mouse interfaces, 10/100BaseT
Ethernet, USB ports, Video, and AC’97 sound. ETX modules support up to 512MB or more of
SODIMM DRAM. Optional –40°C to +85°C operation, along with a 50% thicker PCB are
available to meet your rugged application requirements.

LittleBoard 550 Reference Manual 3

Chapter 1 About this Manual

• EnCore™ Family – These high-performance, compact, rugged Computer-on-Module (COM)
solutions use various processor technologies including x86, MIPS®, and PowerPC™
architectures to plug into your custom baseboard. Each EnCore module provides standard
peripherals, including Ultra/DMA 33/66/100 IDE, floppy drive interface, PCI bus, serial, parallel,
PS/2 keyboard and mouse interfaces, 10/100BaseT Ethernet, and USB ports. Some EnCore
modules also provide video and AC’97 sound. Depending on the model, EnCore modules
support up to 256MB or 512MB of SODIMM DRAM. Extended temperature support up to
+85°C is available.

4 Reference Manual LittleBoard 550

Chapter 2 Product Overview

This introduction presents general information about the EBX Architecture and the LittleBoard 550
single board computer (SBC). After reading this chapter you should understand:

• EBX Architecture

• LittleBoard 550 architecture

• LittleBoard 550 features

• Major components

• Connectors

• Specifications

EBX Architecture

The “Embedded Board, eXpandable” (EBX) standard is the result of a collaboration between industry
leaders, Motorola and Ampro, to unify the embedded computing industry on a small footprint embedded
single-board computer (SBC) standard. The EBX standard principally defines physical size, mounting
hole pattern, and power connector locations. It does not specify processor type or electrical
characteristics. There are recommended connector placements for serial/parallel, Ethernet, graphics, and
memory expansion, including an optional location for PC Card (PCMCIA) expansion.

Derived from the Ampro LittleBoard™ form-factor originated in 1984, EBX combines a standard
footprint with open interfaces. The EBX form-factor is small enough for deeply embedded applications,
yet large enough to contain the functions of a full embedded SBC (single board computer) including
CPU, memory, mass storage interfaces, display controller, serial/parallel ports, today’s advanced
operating systems, and other system functions. This embedded SBC standard 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 EBX standard boasts highly flexible and adaptable system expansion, allowing easy and modular
addition of functions such as USB 2.0, Firewire or wireless networking not usually contained in standard
product offerings. The EBX system expansion is based on popular existing industry standards,

PC/104™ and PC/104-Plus
stacking capability. PC/104-Plus adds the power of a PCI bus to PC/104 while retaining the basic form-

factor. Using PC/104 expansion cards, the PCMCIA standard offers access to PC Cards from the mobile
and handheld computing markets.

The EBX standard integrates all these off-the-shelf standards into a highly embeddable SBC form-factor.
EBX supports the legacy of PC/104, hosting the wide variety of embedded system oriented expansion
modules from hundreds of companies worldwide. PCMCIA brings the advantages of the latest portable
and mobile system expansion technologies to embedded applications. Additionally, the EBX PCI

infrastructure and PC/104-Plus expansion bus offer true processor independence and high performance

standards-based system expansion. See Figure 2-1.

The EBX standard also brings stability to the embedded board market and offers OEMs assurance that a
wide range of products will be available from multiple sources – now and in the future. The EBX
standard is open to continuing technology advancements, since it is both processor and payload
independent. It creates opportunity for economies of scale in chassis, power supply, and peripheral
devices.

The EBX specification is freely available to all interested companies, and may be used without licenses
or royalties. For further technical information on the EBX standard, go to the Ampro web site at

www.ampro.com, or to the PC/104 Consortium web site at www.pc104.org

™

. PC/104 places the ISA bus on compact 3.6” x 3.8” modules with self-

.

LittleBoard 550 Reference Manual 5

Chapter 2 Product Overview

k

4-40 screws (4)

0.6 inch spacers (4)

PCI Stac

Headers

0.6 inch spacers (4)

4-40 nuts (4)

through

Figure 2-1. Stacking PC/104 Modules with the LittleBoard 550

PC/104 Module

PC/104 Plus Module

LittleBoard 550

Product Description

The LittleBoard 550 is an exceptionally high integration, high performance, rugged, and high quality
single-board system, which contains all the component subsystems of a PC/AT PCI motherboard plus
the equivalent of up to 5 PCI expansion boards. The LittleBoard 550 is based on one of these ultra high
performance, high-integration processors; 1GHz Via 1Eden™ ESP 10000, 533MHz Eden™ ESP 5000,
or the low cost 300MHz Eden™ ESP 3000 CPU. This gives designers more of a choice when selecting a
complete, high performance embedded processor based on the EBX form factor that conforms to the
EBX V1.1 specifications.

Stackthrough
Expansion
Bus Headers

LB550stackthru

Each LittleBoard 550 incorporates the Via Technologies Twister-T chipset (VT8606 and VT82C686B)
and a Secondary I/O controller in the Standard Microsystems, Super I/O (SP37E760) controller chip to
provide a floppy and two Ultra/DMA 33/66/100 IDE controllers supporting two IDE drives each
channel, four serial ports, a EPP/ECP parallel port, four USB OHCI ports, PS/2 keyboard and mouse
interfaces, and an audio AC’97 CODEC on the board. The LittleBoard 550 also supports two
independent 10/100BaseT interfaces, up to 1GB of SDRAM in a single 168-pin DIMM slot, and a
AGP4x graphics controller, which provides CRT and flat panel video interfaces for the most popular
LVDS and TFT/LCD panels.

The LittleBoard 550 can be expanded through the PC/104 and PC/104-Plus expansion buses for
additional system functions. These busses offer compact, self-stacking, modular expandability. The
PC/104 is an embedded system version of the signal set provided on a desktop PC's ISA bus. The
PC/104-Plus bus includes this signal set, and in addition, signals implementing a PCI bus, available on
an additional 120-pin (4 rows of 30 pins) PCI expansion bus connector. The PCI bus operates at clock
speeds up to 33MHz.

Among the many embedded-PC enhancements on the LittleBoard 550 that ensure embedded system
operation and application versatility are a watchdog timer, serial console support, battery-free boot, on­board high-density CompactFlash socket, and BIOS extensions for OEM boot customization.

The LittleBoard 550 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. It can be stacked with Ampro MiniModules™ or other PC/104-compliant expansion
boards, or it can be used as powerful computing engine. The LittleBoard 550 requires a single +5V
power supply.

6 Reference Manual LittleBoard 550

Chapter 2 Product Overview

Board Features

• CPU features

♦ Via Eden™ ESP 10000 (1GHz), Eden ESP 5000 (533MHz) or Eden ESP 3000 (300MHz)

♦ Each CPU has a Front Side Bus (FSB) of 133MHz, 133MHz, or 66MHz, respectively

• Memory

♦ Provides a single standard 168-pin DIMM slot

♦ Supports +3.3V SDRAM up to 1GB

♦ Supports 133MHz (7.5ns) clock speed for Eden ESP 10000 and Eden ESP 5000

♦ Supports 66MHz (15ns) clock speed for Eden ESP 3000

♦ Serial EEPROM (SEEP)

• 4k-bit Serial EEPROM

• Supports 2-wire SMBus interface

• Stores system Setup parameters and manufacturing information

• Supports battery-free boot capability

• 512 bits are available for OEM use

• PC/104 and PC/104-Plus Bus Interface

♦ PC/104 Bus speed at 8MHz

♦ PCI 2.3 compliant

♦ PCI Bus speed at 33MHz

• IDE Interfaces

♦ Supports two enhanced IDE controllers (4 devices)

♦ Supports dual bus master mode

♦ Supports Ultra DMA 33/66/100 modes

♦ Supports ATAPI and DVD peripherals

♦ Supports IDE native and ATA compatibility modes

♦ CompactFlash Adapter

• Supports Type I or Type II PC Card socket

• Supports IDE CompactFlash Card

• Supports primary IDE bus with Master/Slave jumper

• Supports bootable CompactFlash

• Floppy Disk Interface

♦ Supports two floppy drives

♦ Supports all standard PC/AT formats: 360KB, 1.2MB, 720KB, 1.44MB, 2.88MB

• Serial Ports

♦ Four buffered serial ports with full handshaking

♦ Provides 16550-equivalent controllers, each with a built-in 16-byte FIFO buffer

♦ Supports full modem capability on two of the four ports

LittleBoard 550 Reference Manual 7

Chapter 2 Product Overview

♦ Supports RS232, RS485, or RS422 operation on each port

♦ Supports programmable word length, stop bits, and parity

♦ Supports 16-bit programmable baud-rate generator and a interrupt generator.

• Parallel Port

♦ Supports standard printer port

♦ Supports IEEE standard 1284 protocols of EPP and ECP outputs

♦ Bi-directional data lines

♦ Supports 16 byte FIFO for ECP mode.

• USB Ports

♦ Supports two root USB hubs

♦ Supports up to four USB ports

♦ Supports USB bootable devices

♦ Supports USB v1.1 and Universal OHCI v1.1

♦ Supports over-current fuses on board

♦ Supports over-current detection status on board

• Keyboard/Mouse Interface

♦ Supports PS/2 keyboard

♦ Supports PS/2 mouse

• Audio interface

♦ Supports AC’97 standard

♦ AC’97 CODEC on board

♦ Audio amplifier on board

• Ethernet Interface

♦ Supports two fully independent Ethernet ports

♦ Integrated LEDs on each port (Link/Activity and Speed)

♦ Two Intel 82551ER Controller chips

♦ Supports IEEE 802.3 10BaseT/100BaseTX 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 802.3x Flow control in full duplex mode

• Half-duplex mode supports enhance proprietary collision reduction mode

8 Reference Manual LittleBoard 550

Chapter 2 Product Overview

• Video Interfaces (CRT/LVDS)

♦ Supports CRT (1600 x 1200) with 32MB SMA (Shared Memory Area)

♦ AGP 4X graphics

♦ Compliant with Rev 2.0 of AGP Interface

♦ 36-bit flat panel outputs (DSTN, TFT)

♦ LVDS outputs (1 or 2 channel, four differential signals 3-bits + clock)

• Miscellaneous

♦ Real-time clock (RTC) operation on board

♦ Battery-free boot

♦ Provides battery socket for Lithium Battery

♦ Supports external battery connection

♦ Thermal and Voltage monitoring

♦ Oops! Jumper (BIOS recovery) support

♦ USB boot

♦ LAN Boot (optional, requires BIOS upgrade)

♦ Serial Console support

♦ Watchdog timer

LittleBoard 550 Reference Manual 9

Chapter 2 Product Overview

A

Block Diagram

Figure 2-3 shows the functional components of the board.

CRT VGA

TFT LCD

LVDS LCD

PC104-Plus
Bus Connector

Ethernet
Controller
82251ER

Ethernet
Controller
82251ER

VIA EDEN
CPU

Northbridge
VT8606

PCI Bus

IrDA 1.1

Floppy

Parallel

Keyboard/
Mouse

AC’97 Link

™

Memory Bus

Southbridge
VT82C686B

SMBus

Clock

SDRAM
SODIMM

TA

IDE Primary
IDE Secondary

IDE Devices,
(HDDs, CompactFlash,
CD-ROM, etc.)

USB Port 1

USB

USB Port 2
USB Port 3
USB Port 4

ISA Bus

Temp

Connector

PC 104

AC’97
CODEC

Magnetics-

Magnetics-

RJ45

RJ45

Figure 2-2. LittleBoard 550 Functional Block Diagram

COM1

COM2

512kB
ROM
BIOS

Super I/O

Dual Serial Port

COM3

COM4

LB550BlkDiagm

10 Reference Manual LittleBoard 550

Chapter 2 Product Overview

Major Integrated Circuits (ICs)

Table 2-1 lists the major integrated circuits, including a brief description of each, on the LittleBoard 550
and Figure 2-4 shows the location of the major chips.

Table 2-1. Major Integrated Circuit Description and Function

Chip Type Mfg. Model Description Function

CPU (U1) VIA

Northbridge
(U2)

Southbridge
(U3)

Super I/O
(U13)

Ethernet
Controllers
(U5, U6)

On Board
Voltage
Regulation
Circuitry

Ethernet 1 (U5)

Southbri dge (U3)

Technologies, Inc.

VIA
Technologies, Inc.

VIA
Technologies, Inc.

Standard
Microsystems

Intel 82551ER Ethernet Controllers provided

L3

L2

L5

U10

J1

U15

Eden ESP 10000,
ESP 5000, ESP 3000

VT8606 (Twister-T)

CPUs offered at 1GHz,
533MHz, and 300MHz

Northbridge functions plus
Video

VT82C686B Southbridge provides most

standard I/O functions

SP37E760 This Super I/O controller

provides two additional serial
ports

by two independent
10/100BaseT Ethernet.

L9

CPU (U1)

J18

Southbr

(U3)

J5

idge

U25

L8

U21

F5

J2

No

(

rthbridg

J4

U2)

e

U34

J31

Et

her

(U5)

n

et

Ether

(

n

U

et

6)

J21

U27

U26

Y5

Embedded
CPU

Memory
and Video

I/O
Functions

Serial
ports

Ethernet
functions

J3

CPU (U1)

DIMM1

J28

Northbridge (U2)

Audio
Amplifier (U27)

Audio
CODEC (U26 )

Clock (U4)

Y1

Ethernet 2 (U6)

Flash (U17)

U24

U22

U11

U16

U17

JP4

JP3

J15

J24

J13

J16

J23

JP5

JP6

U12

U9

JP7

U8 U7

JP8

U14

J14

U33

U20

U4

U23 U19

BAT1

Thermal
Monitor (U33)

Battery (Bat1)

J11

J17

J12

J7

J32

J10

LB550_01a

Figure 2-3. LittleBoard 550 Component Location (Top view)

LittleBoard 550 Reference Manual 11

Chapter 2 Product Overview

Connector Definitions

Table 2-2 describes the connectors shown in Figures 2-3 to 2-5. All I/O connectors use 0.1” pin spacing
unless otherwise indicated.

Table 2-2. Connector Descriptions

Jack # Signal Description

J1A/J1B &
J1C, J1D

J2 Fan connector 3-pin header provides +5v and ground to fan.

J3 Video (LCD 1) 50-pin connector part of video output for LCD panels (lower 24-bits)

J4 Video (LCD 2) 16-pin connector part of video output for LCD panels (upper 12 bits)

J5 Video (CRT) 10-pin connector for output to a CRT type monitor

J7 Ethernet 1 8-pin RJ45 connector for Ethernet port 1

J8 Ethernet 1 Optional 6-pin header for Ethernet port 1; for special builds only

J9 Ethernet 2 Optional 6-pin header for Ethernet port 2, for special builds only

J10 Power In 7-pin connector for input power

J11 Serial A 20-pin connector for serial ports 1 and 2

J12 Primary IDE 40-pin connector for the primary IDE interface

J13 Serial B 20-pin connector for serial ports 3 and 4

J14 Floppy 34-pin connector for floppy disk drive interface

J15 Parallel 26-pin connector for parallel interface

J16 Utility 1 16-pin connector for keyboard, external battery, reset switch, speaker

J17 Secondary IDE 40-pin connector for the secondary IDE interface

J18 Utility 3 10-pin connector provides USB2 and USB3 output

J21 PC/104-Plus 120-pin, 2mm, connector for PCI bus

J23 CompactFlash 50-pin socket accepts Type 1 or Type II CompactFlash cards

J24 Utility 2 24-pin connector for mouse, SMBus, USB 0 & 1, power button

J28 Audio In/Out 26-pin, 2mm, connector for all of the Audio signals (input/output)

J31 Video (LVDS) 20-pin, 1.25mm, connector for LVDS type video displays

J32 Ethernet 2 8-pin RJ45 connector for Ethernet port 2

DIMM1 Memory 168-pin socket for SDRAM DIMMs

PC/104 bus 104-pins for PC/104 connector

Additional Components

The fuses in Table 2-3 are shown in Figures 2-4 and 2-6.

Table 2-3. Additional Component Descriptions

Component Description

F1 (1.5A) Auto Reset Overcurrent Fuse for USB0 on connector J24

F2 (1.5A) Auto Reset Overcurrent Fuse for USB1 on connector J24

F3 (1.5A) Auto Reset Overcurrent Fuse for USB2 on connector J18

F4 (1.5A) Auto Reset Overcurrent Fuse for USB3 on connector J18

F5 (1.5A) Auto Reset Fuse for the CRT on connector J5

12 Reference Manual LittleBoard 550

Chapter 2 Product Overview

J2)Fan (

Utility 3 (J18)

PC/104-Plus
(J21)

CompactFlash
Socket (J23)

Parallel (J15)

Floppy (J14)

Utility 2 (J24)

JP5

JP6

JP7

U8 U7

LCD 2 (J4)

Northb

(U2)

J21

U33

U20

U9

J17

J12

U26

Y5

J11

J31

U23 U19

r

U27

U4

i

dg

e

J7

LCD 1 (J3)

J3

J4

DIMM1

J28

Y1

BAT1

J32

J10

DIMM1

LVDS (J31)

Audio In/
Out (J28)

LB550A_01b

Ethernet
Port 2 (J32)

Ethernet
Port 1 (J7)

Ethernet
Grounding
Pad

CRT (J5)

L9

J5

CRT Fuse (F5)

F5

L8

J2

L3

L2

CPU (U1)

J18

U34

L5

U10

J1

U15

Southbridge

(U3)

U24 U22

U11

U16

U25

U21

E

t

h

e

r

(

n

U

e

5

t

)

E

t

h

e

r

(

n

U

e

6

t

)

J23

U17

JP4

JP3

J15

J24

J16

J13

JP8

U14

U12

J14

Utility 1 (J16)
Serial B (J13, Serial Ports 3 & 4)

Primary IDE (J12)

Serial A (J11, Serial Ports 1 & 2)

Power In (J10)Secondary IDE (J17)

Board
Grounding
Pad (8)

Figure 2-4. Connector and Fuse Locations (Top view)

CAUTION The two Ethernet ports share a common ground (transformer center tap),

that is floating until you determine how the common ground is
connected. The grounding holes (8) of the LittleBoard 550 are
connected to ground potential (return) of the DC power supply
connected to the board through J10.

NOTE Pin-1 is shown as a black pin (square or round) in all connectors and

jumpers in all illustrations.

LittleBoard 550 Reference Manual 13

Chapter 2 Product Overview

Jumper Definitions

Table 2-4 describes the jumpers shown in Figure 2-5.

Table 2-4. Jumper Settings

Jumper # Installed Removed/Installed

JP3 – CompactFlash
Voltage Select

JP4 – CompactFlash
Master/Slave Select

JP5 – Serial Port 1 (COM1)
RS485 Termination

JP6 – Serial Port 2 (COM2)
RS485 Termination

JP7 – Serial Port 3 (COM3)
RS485 Termination

JP8 – Serial Port 4 (COM4)
RS485 Termination

Enable +5V (1-2)

Enable +3.3V (1-3)

(Default)

Enable Master (pins 1-2)

Enable Slave (Removed)

(Default)

Enable Termination (1-2) Disable Termination (Removed)

(Default)

Enable Termination (1-2) Disable Termination (Removed)

(Default)

Enable Termination (1-2) Disable Termination (Removed)

(Default)

Enable Termination (1-2)

Disable Termination (Removed)

(Default)

LED Definitions

Tables 2-5 and 2-6 provide the LED colors and definitions for the Ethernet ports, Port 1 (J7) and Port 2
(J32) located on the LittleBoard 550. Refer to Figure 2-5.

Table 2-5. Ethernet Port 1 (J7) LED Indicators

Indicator Definition

Ethernet
Link/Activity
LED

Link/Activity LED – This yellow LED is the activity/link
indicator and provides the status of Ethernet port 1 (J7).

• A steady On LED indicates a link is established

• A flashing LED indicates active data transfers

Ethernet
Speed LED

Speed LED – This green LED is the Speed indictor and
indicates

• A steady Off LED shows the port at 10BaseT speed

• A steady On LED shows the port at 100BaseT speed

Table 2-6. Ethernet Port 2 (J32) LED Indicators

Indicator Definition

Ethernet
Link/Activity
LED

Link/Activity LED – This yellow LED is the activity/link indicator
and provides the status of Ethernet port 2 (J32).

• A steady On LED indicates a link is established

• A flashing LED indicates active data transfers

Ethernet
Speed LED

Speed LED – This green LED is the Speed indictor and indicates

transmit or receive speed of Ethernet port 2 (J32).

• A steady Off LED shows the port at 10BaseT speed

• A steady On LED shows the port at 100BaseT speed

transmit or receive speed of Ethernet port 1 (J7).

14 Reference Manual LittleBoard 550

Chapter 2 Product Overview

L9

J5

L8

F5

J2

J3

J4

LB550_01c

CF Master/
Slave (JP4)

CF Voltage
Select (JP3)

J24

L3

L2

L5

N

o

rth

(U

b

ridge

2

CPU (U1)

J18

U10

J1

U15

S

o

u

thb

(U3)

r

i

dg

e

U24

U25

U21

U22

U34

E

t

hern

(

U5)

e

t

E

th

ern

(

U6

e

t

)

J21

)

J31

U27

U26

Y5

U4

U33

DIMM1

J28

COM1
RS485
Term

Y1

(JP5)

COM2
RS485
Term
(JP6)

COM3
RS485
Term
(JP7)

COM4

U17

J15

JP4

JP3

U11

U16

J13

J23

JP5

JP6

JP8

U14

U12

J14

U9

JP7

U8

U20

U7

U23 U19

BAT1

J11

J7

J17

J32

RS485
Term

J16

J12

J10

(JP8)

Figure 2-5. Jumpers Locations (Top view)

LittleBoard 550 Reference Manual 15

Chapter 2 Product Overview

Y3

Y4

Y2

Q13 Q14

D6

D4D8

U39

D7

Q4

U28

Q2

Q1

U30

Q3

LB550_02a

USB1 Fuse (F2)

F2

F1

F3

F4

USB0 Fuse (F1)

USB3 Fuse (F4)

USB2 Fuse (F3)

U13

Super I/ O
Controller (U13)

Figure 2-6. Component and Fuses Locations (Bottom view )

Specifications

Physical Specifications

Table 2-7 gives the physical dimensions of the board and Figures 2-7 and 2-8 give the mounting
dimensions and pin-1 connector locations.

Table 2-7. Weight and Footprint Dimensions

Item Dimension

Weight

Height (overall)

Width

Length

Thickness

0.323kg. (0.712lbs.)

25.37mm (0.999”)

146mm (5.75”)

203mm (8.0”)

2.36mm (0.093”)

NOTE Overall height is measured from the

upper board surface to the highest
permanent component (battery in
socket) on the upper board surface.
This measurement does not include
the various heatsinks for the CPUs or
DIMM sizes inserted into the socket.
The heatsinks or DIMMs could
increase this dimension.

16 Reference Manual LittleBoard 550

Chapter 2 Product Overview

Mechanical Specifications

Figures 2-7 and 2-8 show top views of the LittleBoard 550 with the mechanical mounting dimensions.

7.800

7.600

7.500

7.450

7.150

7.115

7.050

5.700

3.915

0.0

0.580

0.230

1.650

3.965

4.050

5.350

7.600

5.800

3.500

3.100

2.800

2.458

0.245

0.0

-0.075

-0.200

0.325

0.0

-0.200

0.705

Figure 2-7. LittleBoard 550 Dimensions (Top view, #1)

1.356

1.875

3.160

NOTE All dimensions are given in inches.

2.700

2.650

2.200

LB550_01d

0.0

4.950

4.025

5.250

5.350

5.550

LittleBoard 550 Reference Manual 17

Chapter 2 Product Overview

7.800

7.600

7.050

6.385

6.350

6.345

0.0

0.115

0.705

1.415

2.730

3.200

4.050

5.350

7.600

6.800

LB550_01e

0.719

0.0

0.0

-0.200

5.350

0.235

0.0

-0.200

-0.107

Figure 2-8. LittleBoard 550 Dimensions (Top view, #2)

5.550

NOTE All dimensions are given in inches.

18 Reference Manual LittleBoard 550

Chapter 2 Product Overview

Power Specifications

Table 2-8 shows the power requirements for the LittleBoard, including the I/O interface board.

Table 2-8. Power Supply Requirements

Parameter 300MHz Characteristics 533MHz Characteristics 1GHz Characteristics

Input Type Regulated DC voltages Regulated DC voltages Regulated DC voltages

In-rush* Current
(Typical)

BIT** Current
(Typical)

Notes: *In-rush measured with video, 64MB memory, and power connected. **The BIT (burn in test)
current was derived with 64MB SDRAM, (1) floppy, (1) IDE HDD, (1) on-board 64MB CompactFlash,
I/O Interface board, (2) serial ports w/loopbacks, (1) externally-powered USB CD-ROM, (1) externally­powered USB HDD, (1) external USB Jump-drive (key-chain CompactFlash type), (1) external USB
CompactFlash Reader with 64MB CompactFlash card, and (2) Ethernet channel connections using
Win2k OS.

26.9Amps (134.5W) 20.6Amps (103W) 25.9Amps (129.5W)

1.98Amps (9.92W) 2.51Amps (12.55W) 2.84Amps (14.21W)

Environmental Specifications

Table 2-9 provides the most efficient operating and storage condition ranges required for this board.

Table 2-9. Environmental Requirements

Processor 300MHz Conditions 533MHz Conditions 1GHz Conditions

Operating

Extended
(Optional)

Temperature

Storage –55° to +85°C

Operating 5% to 95%

Non-operating 5% to 95%

Humidity

+0° to +70°C
(32° to +158°F)

-40° to +85°C
(-40° to +185°F)

(–67° to +185°F)

relative humidity,
non-condensing

relative humidity,
non-condensing

+0° to +70°C
(32° to +158°F)

-40° to +85°C
(-40° to+185°F)

–55° to +85°C
(–67° to +185°F)

5% to 95%
relative humidity,
non-condensing

5% to 95%
relative humidity,
non-condensing

+0° to +70°C
(32° to +158°F)

-40° to +85°C
(-40° to +185°F)

–55° to +85°C
(–67° to +185°F)

5% to 95%
relative humidity,
non-condensing

5% to 95%
relative humidity,
non-condensing

Thermal/Cooling Requirements

The CPU, Northbridge, Southbridge, and voltage regulators are the sources of heat on the board.
The LittleBoard 550 is designed to operate at its maximum CPU speed of 300MHz, 533MHz, or
1GHz. All processors and the northbridge require a heatsink, but no fan is required.

LittleBoard 550 Reference Manual 19

Chapter 2 Product Overview

20 Reference Manual LittleBoard 550

Chapter 3 Hardware

Overview

This chapter discusses the chips and features of the connectors in the following order:

• CPU (U1)

• Memory

• PC/104-Plus (J21A, B, C, D)

• PC/104 (J1A, B, C, D)

• IDE Interfaces (J12, J17)

• CompactFlash Adapter (J23)

• Floppy Interface (J14)

• Serial Interfaces (J11, J13)

• Parallel Interface (J15)

• Utility Interfaces (J16, J18, J24)

♦ Keyboard

♦ Mouse

♦ Battery

♦ Reset Switch

♦ Speaker

♦ USB

♦ SMBus

• Ethernet Interfaces (J7, J32)

• Audio Interface (J28)

• Video Interfaces (J3, J31)

• Miscellaneous

♦ Time of Day/RTC

♦ Temperature Monitoring

♦ Oops! Jumper (BIOS recovery)

♦ Serial Console

♦ Watchdog timer

• Power Interface (J10)

NOTE Ampro Computers, Inc. only supports the features/options tested and listed in this

manual. The main integrated circuits (chips) used in the LittleBoard 550 may
provide more features or options than are listed for the LittleBoard 550, but some
of these chip features/options are not supported on the board and may not
function as specified in the chip documentation.

LittleBoard 550 Reference Manual 21

Chapter 3 Hardware

CPU (U1)

The LittleBoard 550 offers three VIA Technologies Eden processor choices; high performance 1GHz
ESP 10000 processor, 533MHz ESP 5000 processor, or the low cost, 300MHz ESP3000 processor.

ESP Processors

The ESP (0.13µ or 0.15µ) processors at 1GHz, 533MHz, or 300MHz use 133MHz, 133MHz, or 66MHz
FSB (front side bus) respectively, with 128kB Level 1 cache and 64kB Level 2 cache. The ESP
processors require a heatsink, but no fan.

NOTE A CPU fan connector is provided for your convenience to

accommodate any special requirements. See Table 3-28.

Memory

The LittleBoard 550 memory consists of the following elements:

• SDRAM

• Flash memory

• Serial EEPROM (SEEP)

SDRAM Memory (DIMM1)

The LittleBoard 550 supports a single standard 168-pin DIMM slot.

• DIMM slot can support up to 2GB of memory

• Supports PC 133 (133MHz, 7.5ns) and PC 100 (100MHz, 10ns)

• +3.3V SDRAM

NOTE Ampro recommends using only PC 133 (133MHz), 3.3V, 7.5ns, 168-

pin, SDRAM DIMM, but PC 100 (100MHz, 10ns) will function. PC
133 provides the best performance for the Eden processors.

Flash Memory (U17)

There is an 8-bit wide, 512kB flash device used for system BIOS that is connected to the Southbridge,
VT82C686B, through an ISA bus transceiver. The BIOS is re-programmable and the supported features

are detailed in Chapter 4, BIOS Setup.

Serial EEPROM (SEEP)

The 2-wire Serial EEPROM (SEEP) contains 4k-bits and at least 512-bit area is reserved for the user.
The SEEP is used to store system parameters for battery-free boot capability when there is no battery
present. The SEEP uses the SMBus as its 2-wire interface.

22 Reference Manual LittleBoard 550

Chapter 3 Hardware

Interrupt Channel Assignments

The channel interrupt assignments are shown in Table 3-1.

Table 3-1. Interrupt Channel Assignments

Device vs IRQ No. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Timer
Keyboard
Secondary

Cascade
COM1
COM2
COM3
COM4
Floppy
Parallel
RTC
IDE Primary
IDE Secondary
Math Coprocessor
PS/2 Mouse
PCI INTA
PCI INTB
PCI INTC
PCI INTD
Sound Blaster
USB
VGA
Ethernet

X

X

X

OD

DO

OO OD

OO DO

X

OD

X

XO

OX

X

X

Automatically Assigned

Automatically Assigned

Automatically Assigned

Automatically Assigned

DOOO

Automatically Assigned

Automatically Assigned

Automatically Assigned

Legend: D = Default, O = Optional, X = Fixed

NOTE The IRQs for the Ethernet, Video, and Internal Local Bus (ISA) are

automatically assigned by the BIOS Plug and Play logic. Local IRQs
assigned during initialization can not be used by external devices.

Memory Map

The following table provides the common PC/AT memory allocations. Memory below 000500h is used
by the BIOS.

LittleBoard 550 Reference Manual 23

Chapter 3 Hardware

Table 3-2. Memory Map

Base Address Function

00000000h - 0009FFFFh Conventional Memory

000A0000h - 000AFFFFh Graphics Memory

000B0000h - 000B7FFFh Mono Text Memory

000B8000h - 000BFFFFh Color Text Memory

000C0000h - 000C7FFFh Standard Video BIOS

000F0000h - 000FFFFFh System BIOS Area (Storage and RAM Shadowing)

00100000h - 04000000h

Extended Memory (If onboard VGA is enabled, then the amount
of memory assigned is subtracted from extended memory)

FFF80000h - FFFFFFFFh System Flash

I/O Address Map

Table 3-3 shows the I/O address map.

Table 3-3. I/O Address Map

Address (hex) Subsystem

000-00F Primary DMA Controller

020-021 Master interrupt Controller

040-043 Programmable Interrupt Timer (Clock/Timer)

060-06F Keyboard Controller

070-07F CMOS RAM, NMI Mask Reg, RT Clock

080-09F DMA Page Registers

092 Fast A20 gate and CPU reset

094 Motherboard enable

102 Video subsystem register

0A0-0BF Slave Interrupt Controller

0C0-0DF Slave DMA Controller #2

0F0-0FF Math Coprocessor

170-177 Secondary IDE Hard Disk Controller

1F0-1F8 Primary IDE Hard Disk Controller

278-27F Parallel Printer

2E8-2FF Serial Port 4 (COM4)

2F8-2FF Serial Port 2 (COM2)

378-37F Parallel port (Standard and EPP)

3C0-3DF VGA

3E8-3EF Serial Port 3 (COM3)

3F0-3F7 Floppy Disk Controller

3F8-3FF Serial Port 1 (COM1)

778-77A Parallel Port (ECP Extensions) (Port 378+400)

CF8-CFF PCI bus Configuration Address and Data

24 Reference Manual LittleBoard 550