Advantech SOM-ETX Series Guide

Advantech
SOM-ETX Series
System On Modules
Design Guide
Version 1.0

Advantech SOM-ETX Design Guide
Notices
The copyright on this user manual remains with Advantech Co., Ltd. No part of this
user manual may be transmitted, reproduced, or changed.
Other companies’ product names that may be used herein remain the property of
their respective owners.
The product specifications, design and this user’s manuals content are subject to
change without notice.
If you have any questions, please contact your merchant or our service center for
clarification. We are not responsible for any losses resulting from using this product
no matter what the reason.
Revision History
Version/Revision date Date Description
Version 1.0 May 29, 2005 Initial release
Part No: 20060ETX00
2 Notices

Advantech SOM-ETX Design Guide
Table of Contents
Chapter 1 Introduction............................................................................................9
1.1 Terminology.............................................................................................9
Table 1.1 Conventions and Terminology.......................................9
1.2 Referenced Documents.........................................................................10
Table 1.2 Referenced Documents...............................................10
Chapter 2 SOM-ETX Overview .............................................................................11
2.1 Overview................................................................................................11
Figure 2-1 .....................................................................................11
Figure 2-2 .....................................................................................11
Figure 2-3 .....................................................................................12
2.2 Specifications ........................................................................................13
Table 2.1 SOM-4481 Specifications ............................................13
2.2.1 SOM-4481 ....................................................................................14
Figure 2-4 SOM-4481 Block Diagram...........................................14
Table 2.2 SOM-4481 Specifications ............................................15
2.2.2 SOM-4486 ....................................................................................16
Figure 2-5 SOM-4486 Block Diagram...........................................16
Table 2.3 SOM-4486 Specifications ............................................17
2.2.3 SOM-4475 ....................................................................................18
Figure 2-6 SOM-4475 Block Diagram...........................................18
Table 2.4 SOM-4475 Specifications ............................................19
2.2.4 SOM-4472 ....................................................................................20
Figure 2-7 SOM-4472 Block Diagram...........................................20
Table 2.5 SOM-4472 Specifications ............................................21
2.2.5 SOM-4470 ....................................................................................22
Figure 2-8 SOM-4470 Block Diagram...........................................22
Table 2.6 SOM-4470 Specifications ............................................23
2.2.6 SOM-4451 ....................................................................................24
Figure 2-9 SOM-4451 Block Diagram...........................................24
Table 2.7 SOM-4451 Specifications ............................................25
2.2.7 SOM-4450 ....................................................................................26
Figure 2-10 SOM-4450 Block Diagram.........................................26
Table 2.8 SOM-4450 Specifications ............................................27
2.2.8 SOM-DB4400 ...............................................................................28
Figure 2-11 SOM-DB4400 Block Diagram....................................28
Table 2.9 SOM-DB4400 ..............................................................28
2.3 System Resources ................................................................................29
2.3.1 SOM-4481 Resources ..................................................................29
Table 2.10 SOM-4481 IRQ Resources........................................29
Table 2.11 SOM-4481 DMA Resources ......................................29
Table 2.12 SOM-4481 Memory Map ...........................................30
Table 2.13 SOM-4481 I/O Map....................................................31
Table 2.14 SOM-4481 Alternative Device Resources .................31
2.3.2 SOM-4475 IRQ Resources...........................................................32
Table 2.15 SOM-4475 IRQ Resources........................................32
Table 2.16 SOM-4475 DMA Resources ......................................32
Table 2.17 SOM-4475 Memory Map ...........................................32
Table 2.18 SOM-4475 I/O Map....................................................33
Table 2.19 SOM-4475 Alternative Device Resources .................33
2.3.3 SOM-4472 Resources ..................................................................34
Table 2.20 SOM-4472 IRQ Resources........................................34
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Advantech SOM-ETX Design Guide
Table 2.21 SOM-4472 DMA Resources ......................................34
Table 2.22 SOM-4472 Memory Map ...........................................34
Table 2.23 SOM-4472 I/O Map....................................................35
Table 2.24 SOM-4472 Alternative Device Resources .................35
2.3.4 SOM-4470 Resources ..................................................................36
Table 2.25 SOM-4470 IRQ Resources........................................36
Table 2.26 SOM-4470 DMA Resources ......................................36
Table 2.27 SOM-4470 Memory Map ...........................................36
Table 2.28 SOM-4470 I/O Map....................................................37
Table 2.29 SOM-4470 Alternative Device resources...................37
2.3.5 SOM-4451 Resources ..................................................................38
Table 2.30 SOM-4451 IRQ Resources........................................38
Table 2.31 SOM-4451 DMA Resources ......................................38
Table 2.32 SOM-4451 Memory Map ...........................................38
Table 2.33 SOM-4451 I/O Map....................................................39
Table 2.34 SOM-4451 Alternative Device Resources .................39
2.3.6 SOM-4450 Resources ..................................................................40
Table 2.35 SOM-4450 IRQ Resources........................................40
Table 2.36 SOM-4450 DMA Resources ......................................40
Table 2.37 SOM-4450 Memory Map ..........................................40
Table 2.38 SOM-4450 I/O Map....................................................41
2.4 PCI Routing ...........................................................................................42
Table 2.40 Advantech SOM-ETX Modules PCI Routing .............42
2.5 DC Specifications ..................................................................................42
2.5.1 Power Consumption .....................................................................42
Table 2.41 Power Consumption (SOM-4481)..............................42
Table 2.42 Power Consumption (SOM-4475)..............................43
Table 2.43 Power Consumption (SOM-4472)..............................43
Table 2.44 Power Consumption (SOM-4470)..............................43
Table 2.45 Power Consumption (SOM-4451)..............................44
Table 2.46 Power Consumption (SOM-4450)..............................44
Figure 2-12 SOM-ETX Power Consumption................................45
2.5.2 Interface I/O Voltage.....................................................................46
Table 2.47 DC specifications for 5V signaling of PCI Bus...........46
Table 2.48 DC specifications for 3.3V signaling of PCI Bus........46
Table 2.49 DC specification of USB signals ................................46
Table 2.50 AC’97 CODEC DC specification................................47
Table 2.51 AC’97 CODEC analog I/O DC specification ..............47
Table 2.52 Hsync and Vsync signals specification......................47
Table 2.53 RGB Voltage..............................................................47
Table 2.54 LCD I/O Voltage.........................................................47
Table 2.55 Ultra DMA modes 1-4 (5V) ........................................48
Table 2.56 Ultra DMA modes 5 (3.3V).........................................48
Table 2.57 Ethernet I/O Voltage ..................................................48
Table 2.58 TV-Out I/O Voltage ....................................................48
Table 2.59 IrDA I/O Voltage.........................................................48
Table 2.60 I2C I/O Voltage ..........................................................49
Table 2.61 SMBus I/O Voltage ....................................................49
2.6 AC Specification ....................................................................................50
2.6.1 PCI-Bus AC Spec. ........................................................................50
2.6.2 Universal Serial Bus (USB) AC Spec. ..........................................50
2.6.3 Audio AC Spec. ............................................................................50
2.6.4 VGA AC Spec...............................................................................50
2.6.5 LCD AC Spec. ..............................................................................50
2.6.6 IDE AC Spec.................................................................................50
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Advantech SOM-ETX Design Guide
2.6.7 Ethernet AC Spec.........................................................................50
2.6.8 TV-Out Bus AC Spec....................................................................50
2.6.9 I2C AC Spec.................................................................................50
2.6.10 SMBus AC Spec. ..........................................................................50
Chapter 3 Pin Assignments .................................................................................51
Figure 3-1 SOM-ETX, X1- X4 Diagram .......................................51
Table 3.1 Convention and Terminology.......................................52
3.1 Connector X1 (PCI-Bus, USB, Audio) ...................................................53
Table 3.2 Connector X1 Pin Assignments...................................53
3.2 Connector X2 (ISA-Bus) ........................................................................54
Table 3.3 Connector X2 Pin Assignments...................................54
3.3 Connector X3 (VGA, LCD/LVDS, COM1/2, LPT/Floppy, IrDA, KB/MS,
TV-Out)..................................................................................................55
Table 3.4 Connector X3 Pin Assignments...................................55
3.4 Connector X4 ( IDE1, IDE2, Ethernet, Miscellaneous ).........................56
Table 3.5 Connector X4 Pin Assignments...................................56
Chapter 4 General Design Recommendations ...................................................57
4.1 Nominal Board Stack-Up .......................................................................57
4.1.1 Four layer board stack-up.............................................................58
Figure 4-1 Four-Layer Stack-up with 2 Signal Layers and 2 Power
Planes...........................................................................................58
4.1.2 Six layer board stack-up ...............................................................59
Figure 4-2 .....................................................................................59
Table 4.2 Recommended Board Stack-Up Dimensions ..............59
4.2 Alternate Stack Ups...............................................................................60
Chapter 5 Carrier Board Design Guidelines .......................................................61
5.1 PCI-Bus .................................................................................................61
5.1.1 Signal Description.........................................................................61
Table 5.1 PCI Signal Description.................................................61
5.1.2 Design Guidelines.........................................................................62
Table 5.2 Carrier PCI Slots/Devices Interrupt Routing Table ......62
Figure 5-1 Routing PCI Slot/Device CSB Interrupt ......................63
Table 5.3 Clock Skew Parameters ..............................................63
Figure 5-2 Clock Skew Diagram..................................................64
Table 5.4 Maximum Add-in Card Loading via Each Power Rail ..64
Table 5.5 Add-in Card Supplied Power Selection........................65
5.1.3 Layout Guidelines.........................................................................65
Figure 5-3 PCI Bus Layout Example with IDSEL.........................65
Table 5.6 PCI Data Signals Routing Summary............................66
Figure 5-4 PCI Clock Layout Example.........................................66
Table 5.7 PCI Clock Signals Routing Summary ..........................67
5.1.4 Application Notes..........................................................................67
Figure 5-5 Design Example PCI Arbiter......................................67
5.2 Universal Serial Bus (USB) ...................................................................68
5.2.1 Signal Description.........................................................................68
Table 5.8 USB Signals Description..............................................68
5.2.2 Design Guideline ..........................................................................69
Figure 5-6 USB Connections.......................................................69
Figure 5-7 Common Mode Choke ...............................................70
5.2.3 Layout Guideline...........................................................................70
Figure 5-8 USB Layout Guidelines ..............................................70
Figure 5-9 Over-Current Circuit ...................................................71
Figure 5-10 Violation of Proper Routing Techniques...................71
Figure 5-11 Creating Unnecessary Stubs....................................72
5.3 Audio Codec 97(AC’97).........................................................................72
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Advantech SOM-ETX Design Guide
5.3.1 Signal Description.........................................................................72
Table 5.9 Audio signals description.............................................72
5.3.2 Design Note ..................................................................................73
Figure 5-12 Audio Connetions.....................................................73
5.3.3 Layout Requirement .....................................................................74
Figure 5-13 Audio Layout Guidelines ..........................................74
5.4 ISA-Bus .................................................................................................75
5.4.1 Signal Description.........................................................................75
Table 5.11 ISA Bus signals description .......................................75
5.4.2 Design Guideline ..........................................................................77
5.4.3 Layout Guideline...........................................................................78
Figure 5-14 ISA BUS necessary Pull up resistors location..........78
5.5 VGA .......................................................................................................79
5.5.1 Signal Description.........................................................................79
Table 5.12 VGA signals description.............................................79
5.5.2 Design Guideline ..........................................................................79
Figure 5-15 VGA Connections.....................................................79
5.5.3 Layout Guideline...........................................................................80
Figure 5-16 VGA Layout Guidelines ............................................80
Figure 5-17 RGB Output Layout Guidelines ................................80
5.6 LVDS/TTL LCD......................................................................................81
5.6.1 Signal Description.........................................................................81
Table 5.13 LVDS and TTL signals description ............................81
5.6.2 Design Guideline ..........................................................................82
Figure 5-18 LVDS LCD Connections...........................................82
Figure 5-19 TTL LCD Connections..............................................82
Table 5.14 LVDS, TTL LCD Pin-out ............................................83
5.6.3 Layout Requirement .....................................................................83
Figure 5-20 LVDS LCD Layout Guideline....................................83
Figure 5-21 TTL LCD Layout Guideline.......................................84
5.7 IDE0/IDE1..............................................................................................84
5.7.1 Signal Description.........................................................................84
Table 5.15 IDE signals description ..............................................84
5.7.2 Design Guideline ..........................................................................86
Figure 5-22 IDE Master/Slave Handshake Signals Connection ..86
Figure 5-23 IDE Bus Trace on Carrier Board and Cable Length
Limitation ......................................................................................87
Figure 5-24 IDE0/IDE1 Connections ...........................................87
5.7.3 Layout Guideline...........................................................................88
Table 5.16 IDE Signal Groups.....................................................88
Table 5.17 IDE Routing Summary ...............................................88
5.8 Ethernet.................................................................................................89
5.8.1 Signal Description.........................................................................89
Table 5.18 Ethernet signals description.......................................89
5.8.2 Design Guideline ..........................................................................89
Figure 5-25 10/100M Ethernet Connections................................90
5.8.3 Layout Guideline...........................................................................90
Figure 5-27 Critical Dimensions...................................................91
5.9 Serial Port(Com1/Com2) .......................................................................92
5.9.1 Signal Description.........................................................................92
Table 5.19 Serial Bus signals description.....................................92
5.9.2 Design Note ..................................................................................93
Figure 5-28 Serial Bus Connections............................................93
5.9.3 Layout Requirement .....................................................................93
Figure 5-29 Serial Bus Layout Guidelines ...................................93
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Advantech SOM-ETX Design Guide
5.10 LPT/Floppy ............................................................................................93
5.10.1 Signal Description.........................................................................94
Table 5.20 LTP/Floppy Signal Descriptions.................................94
5.10.2 Design Note ..................................................................................95
Table 5.21 Pull-high resistor in different SOM modules ..............95
Figure 5-30 LPT Connections......................................................96
Figure 5-31 Floppy Connections..................................................96
5.10.3 Layout Requirement .....................................................................98
Figure 5-32 Practical LPT Port Design ........................................99
Figure 5-33 Practical Floppy Design............................................99
Figure 5-34 Practical LPT Port Design Using PAC1284............100
5.11 PS/2 Keyboard and Mouse..................................................................100
5.11.1 Signal Description.......................................................................100
Table 5.22 KB/MS signal descriptions.......................................100
5.11.2 Design Note ................................................................................101
Figure 5-35 Keyboard and Mouse connection...........................101
5.11.3 Layout Requirement ...................................................................101
Figure 5-36 Practical KB/MS circuit...........................................102
5.11.4 EMI Consideration ......................................................................102
5.12 TV-Out .................................................................................................102
5.12.1 Signal Description.......................................................................102
Table 5.23 TV signals description...............................................102
5.12.2 Design Guideline ........................................................................103
Figure 5-37 Two Composite and One S-Video Outputs\ ...........103
Figure 5-38 One Composite and One SCART Outputs.............104
5.12.3 Layout Guideline.........................................................................104
Figure 5-39 TV DAC Signal Routing Spacing............................105
5.13 IrDA .....................................................................................................106
5.13.1 Signal Description.......................................................................106
Table 5.24 IrDA signals description............................................106
5.13.2 Design Guideline ........................................................................106
Figure 5-40 .................................................................................106
Figure 5-41 .................................................................................107
5.13.3 Layout Guideline.........................................................................107
5.14 Miscellaneous......................................................................................108
5.14.1 Miscellaneous Signal Description...............................................108
Table 5.25 Misc signal descriptions............................................108
5.14.2 Speaker ......................................................................................109
Figure 5-42 Speaker Connections.............................................109
5.14.3 Battery ........................................................................................110
Figure 5-43 Battery Connections...............................................110
5.14.4 I2C Bus.......................................................................................110
Figure 5-44 I2C Bus Connections..............................................110
5.14.5 SMBus ........................................................................................111
Figure 5-45 I2C Bus Connections..............................................111
5.14.6 Power Good / Reset Input ..........................................................111
Figure 5-46 Power Good / Reset Input Connections .................111
5.14.7 ATX Power Supply Control .........................................................112
Figure 5-47 ATX Power Supply Connections ............................112
5.14.8 External SMI Interrupt.................................................................113
Figure 5-48 External SMI Interrupt Connections .......................113
5.14.9 Wake on Ring .............................................................................113
Figure 5-49 Wake on Ring Connections(two Comport) .............113
Figure 5-50 Wake on Ring Connections(multiple Comport) ......114
Chapter 6 Power Delivery Guidelines ...............................................................115
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Advantech SOM-ETX Design Guide
6.1 SOM Power Consumption ...................................................................115
Table 6.1 SOM series board Power Consumption ....................115
6.2 Design Guidelines ...............................................................................116
6.2.1 ATX Power Delivery Block Diagram ...........................................116
Figure 6-1 ATX Power Delivery Block Diagram.........................116
6.2.2 AT Power Delivery Block Diagram..............................................117
Figure 6-2 AT Power Delivery Block Diagram ...........................117
6.2.3 Non-used 3.3V Pins on SOM Connector ....................................117
Chapter 7 Carrier Board Mechanical Design Guidelines.................................118
7.1 SOM-ETX Mechanical Dimensions .....................................................118
Figure 7-1 SOM-ETX Carrier Board Mechanical Dimensions ...118
Table 7.1 connector types .........................................................118
Figure 7-2 ...................................................................................119
Figure 7-3 SOM-ETX Carrier Board Connector Mechanical
Dimensions.................................................................................119
7.1.1 Hirose FX8 and FX8C Series Information (reference to Hirose
Spec) ........................................................................................120
Table 7.2 Hirose FX8 and FX8C Series info..............................120
Table 7.3 Hirose FX8 and FX8C Series info..............................120
Figure 7-4 ...................................................................................121
Chapter 8 Heatsink Recommended Design......................................................122
8.1 Material of Heatsink.............................................................................122
8.2 Thermal Interface Material...................................................................123
8.3 Attachment Method of Thermal Solution .............................................123
8.4 Grounding Issues ................................................................................123
8.5 Air intake clearance and Airflow of Heatsink .......................................123
Figure 8-1 Air Intake Clearance.................................................124
Figure 8-2 Air Flow Direction .....................................................124
8.6 EXT-SOM Heatsink Specification........................................................124
Figure 8-3 SOM-ETX Heatsink ..................................................124
8.7 Advantech Heatsink Information..........................................................125
8.7.1 Heatsink......................................................................................125
Figure 8-4 Heatsink appearance ...............................................125
Figure 8-5 Heatsink Dimensions................................................126
Table 8.1 Chemical Makeup & Temper Designation .................126
Figure 8-6 Dimensions................................................................127
Table 8.2 Chemical Makeup & Temper Designation .................127
Figure 8-7 Dimensions................................................................128
Table 8.3 Mechanical Characteristics........................................128
Table 8.4 Chemical Makeup & Temper Designation .................128
Figure 8-8 Dimensions................................................................129
Table 8.5 Thermal pad................................................................129
8.7.2 Vendor List..................................................................................131
Table 8.6 Vendor list Aluminum Extruded Heat Sink,................131
8.7.3 Thermal Pad ...............................................................................131
Figure 8-9 Thermal Pad.............................................................131
Table 8.7 Thermal pad................................................................131
8.7.4 Screw ........................................................................................131
Table 8.8 Screw..........................................................................131
8.7.5 Fan ........................................................................................132
Figure 8-10 Fan .........................................................................132
Table 8.9 Fan Physical Characteristics ......................................132
8.7.6 Test Results................................................................................133
Table 8.10 Thermal Specifications ............................................133
Table 8.12 Test Results..............................................................133
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Advantech SOM-ETX Design Guide
Chapter 1 Introduction
The design guide organizes and provides Advantech SOM baseboard design
recommendations for Advantech SOM-ETX modules. It specifies common
mechanical and electrical characteristics in order to ensure the baseboard design
meets these requirements and works properly.
1.1 Terminology
Table 1.1 Conventions and Terminology
AC97 Audio Codec 97’
AGP Accelerated Graphics port refers to the AGP/PCI interface
CPU Central processing Unit
CRT Cathode Ray Tube
DDR Double Data Rate SDRAM memory technology
DTOS Advantech’s Design To Order Service
EMI Electromagnetic Interference
ESD Electrostatic Discharge
ETX Embedded Technology Extended
FSB Front Side Bus, synonymous with Host or CPU bus
GMCH Refers to the Graphics Memory Controller Hub chipset component
I2C Inter-IC (a two wire serial bus created by Philips)
ISA International Standards Association
IDE (ATA) Integrated Drive Electronics (Advanced Technology Attachment)
INTx An interrupt request signal where x stands for interrupts A, B, C, and D.
LCD Liquid Crystal Display
LVDS Low Voltage Differential Signaling: A high speed, low power data
transmission standard used for display connections to LCD panels.
MCH Refers to the Memory Controller Hub chipset component
NTSC National Television Standards Committee
PAL Phase Alternate Line
PCI Peripheral Component Interface
RTC Real Time Clock
SMBus System Management Bus.
SOM System On Module
ULV Ultra-Low Voltage
USB Universal Serial Bus
Chapter 1 Introduction 9

Advantech SOM-ETX Design Guide
1.2 Referenced Documents
Table 1.2 Referenced Documents
Document Location
Advanced Configuration
and Power Management
(ACPI) Specification 1.0b &
2.0
http://www.teleport.com/~acpi/
Advanced Power
Management (APM)
Specification 1.2
http://www.microsoft.com/hwdev/busbios/amp_12.htm
Ethernet(IEEE 802.3) http://www.ieee.org/portal/site
I2C Bus Interface http://www.semiconductors.philips.com/
IrDA http://www.irda.org/
PCI http://www.pcisig.com/
PC104 http://www.pc104.org/technology/pc104_tech.html
RS232 http://www.eia.org/
SMBus http://www.smbus.org/specs/
USB http://www.usb.org/home
10 Chapter 1 Introduction

Advantech SOM-ETX Design Guide
Chapter 2 SOM-ETX Overview
SOM-ETX provides a scalable solution that meets customer's advanced CPU
application development needs and reduces time-to-market. Using SOM-DTOS,
customers can reduce traditional customized CPU board development time and costs
by as much as 80%.
2.1 Overview
Advantech offers a wide range of SOM products to cater to each customer's
demands. The modular designs allow upgrade ability and add more flexibility to the
system. The SOM-ETX form factor allows the CPU modules to be easily and
securely mounted on a customized solution board. The design and multiple
processor choices eliminate CPU integration worries and allow fast application
support for the most dynamic embedded needs.
Figure 2-1
SOM-ETX is a series of reliable and widely used CPU cores with high integration
features. It can support fanless operation in small form factors while supporting CPUs
ranging from GX1 to Pentium M. Not only does SOM-ETX allow quick design, it also
provides the benefits of easy installation, maintenance and upgrade ease.
Figure 2-2
Chapter 2 SOM-ETX Overview 11

Advantech SOM-ETX Design Guide
Though small in size, SOM-ETX takes care of most complicated CPU architectures
and basic common circuits. Many system integrators are finding an Advantech SOM-
ETX solution already covers 80% of their feature requirements. This makes SOM-
ETX a powerful time and money saver.
Figure 2-3
SOM-ETX + Customer Solution Board = Your Customized Platform which perfectly
fits system-level requirements and saves time and reduces total project management
cost.
12 Chapter 2 SOM-ETX Overview

Advantech SOM-ETX Design Guide
2.2 Specifications
Advantech provides six SOM-ETX modules, and each module has a different CPU
type for customers to choose. Table 2.1 shows Advantech SOM-ETX modules with
brief descriptions.
Table 2.1 SOM-ETX Modules
SOM-4481 Series Description
SOM-4481FL-00A1 SOM-ETX w/Socket 478 w/VGA/LVDS/LAN/AUDIO
SOM-4481FL-M0A1 SOM-ETX w/Celeron M 600MHz/CPU/VGA/LVDS/LAN/AUDIO
SOM-4481FL-S0A1 SOM-ETX w/Pentium M 1.1GHz/CPU/VGA/LVDS/LAN/AUDIO
SOM-4486 Series Description
SOM-4486FL-M0A1 SOM-ETX w/Celeron M 600MHz w/VGA/LVDS/LAN/AUDIO
SOM-4475 Series Description
SOM-4475F-J0A1 SOM-ETX w/Intel Celeron 400 MHz/VGA/LCD/LAN/AUDIO
SOM-4475FL-J0A1 SOM-ETX w/Intel Celeron 400 MHz/VGA/LVDS/LAN/ AUDIO
SOM-4475F-M0A1 SOM-ETX w/Intel Celeron 650 MHz/VGA/LCD/LAN/ AUDIO
SOM-4475FL-M0A1 SOM-ETX w/Intel Celeron 650 MHz/VGA/LVDS/LAN/ AUDIO
SOM-4475F-R0A1 SOM-ETX w/Intel PIII 933 MHz/VGA/LCD/LAN/AUDIO
SOM-4475FL-R0A1 SOM-ETX w/Intel PIII 933 MHz/VGA/LVDS/LAN/AUDIO
SOM-4472 Series Description
SOM-4472F-J0A2 SOM-ETX w/VIA Eden 400 MHz/VGA/LCD/LAN/AUDIO/TV
SOM-4472FL-J0A2 SOM-ETX w/VIA Eden 400 MHz/VGA/LVDS/LAN/AUDIO/TV
SOM-4472F-M0A2 SOM-ETX w/VIA Eden 667 MHz/VGA/LCD/LAN/AUDIO/TV
SOM-4472FL-M0A2 SOM-ETX w/VIA Eden 667 MHz/VGA/LVDS/LAN/AUDIO/TV
SOM-4472F-S0A2 SOM-ETX w/VIA-LP1G/VGA/LCD/LAN/AUDIO/TV
SOM-4472FL-S0A2 SOM-ETX w/VIA-LP1G/VGA/LVDS/LAN/AUDIO/TV
SOM-4470 Series Description
SOM-4470F-J0A1 SOM-ETX Module w/Intel® Celeron-400/VGA/LCD/LAN/AUDIO/TV
SOM-4470F-L4A1 SOM-ETX Module w/Intel® PIII-500/ VGA/LCD/LAN/AUDIO/TV
SOM-4470F-P4A1 Intel® SOM-ETX Module w/Intel® PIII-700/VGA/LCD/LAN/AUDIO/TV
SOM-4451 Series Description
SOM-4451F-D0A1 SOM-ETX Module w/ SiS 552/VGA/LCD/Audio
SOM-4451FL-D0A1 SOM-ETX Module w/ SiS 552/VGA/LVDS/Audio
SOM-4450 Series Description
SOM-4450F-G0A1 SOM-ETX Module w/AMD GX1-300/VGA/LCD/Audio/TV
SOM-4450FL-G0A1 NS SOM-ETX Module w/AMD GX1-300/VGA/LVDS/Audio/TV
Others Description
SOM-DB4400-00A2 SOM-ETX Development Board Rev. A2
SOM-FANKIT-1000 Fan Kit for SOM-ETX Module
Chapter 2 SOM-ETX Overview 13

Advantech SOM-ETX Design Guide
2.2.1 SOM-4481
Advantech’s new SOM-4481 is an ultimate powerful, fanless SOM-ETX CPU module
able to drive the most demanding embedded applications requiring high performance
CPU processing & graphics support. With support for an Intel® Pentium® M and
Celeron® M processors up to 1.1GHz and enhanced SpeedStep technology, the
SOM-4481 offers developers a low power and scaleable solution that fits a range of
needs.
The Intel® 855GME/ICH4 core chipset is a high performance 3D AGP 4x Graphics
engine, giving any platform superior multimedia capability also the ECC Double Data
Rate (DDR) & USB2.0 supporting providing the stable and reliable on whole system
architecture.
ISA BUS
(W83628F/W83629D)
PCI-ISA Bridge
(82562EZ)
10/100 LAN Ethernet
LCI BUS
USB 2.0 x 4
FWH
Mic
(W83627HF)
(Up to 1GB)
DDR SDRAM
AC-Link
Intel ICH4
Analog RGB
DDR266/DDR333
Codec
LPT/FLOPPY
COM1/COM2
(Banias/Dothan)
PCI BUS
AC'97
Intel GMCH
(82801DB)
Dual channel LVDS
(ALC202)
LPC Super I/O
Hub I/F 266MB/s
Intel Pentium M
Line-In
LPC BUS
PRIMARY IDE / ATA100
(855GME)
PS/2 KB&MS
SECONDARY IDE / ATA100
Line-Out
400MHz PSB
IRDA
200pin SODIMM x 1
Figure 2-4 SOM-4481 Block Diagram
14 Chapter 2 SOM-ETX Overview

Advantech SOM-ETX Design Guide
SOM-4481 Main Features:
• Embedded Intel® Pentium® M/ Celeron M processor
• Supports ECC DDR Memory
• Supports 4 ports host USB 2.0
• Supports up to dual channel LVDS panels
Table 2.2 SOM-4481 Specifications
Item Description
CPU Embedded Intel Pentium M or Celeron M processor w/64KB
primary cache memory
System Memory
2 x 200 pin SO-DIMM sockets, support ECC Double
DataRate (DDR)128 MB to 1 GB, accept 128/256/512/
1000 MB DR200/266/333 DRAM.
2nd Cache Memory 1 MB on the Pentium M processor or 512 KB on the Celeron M
processor.
System Chipset Intel 855GME GMCH/ ICH4 Chipset 400 MHz FSB
BIOS AWARD 4 Mbit Flash BIOS
WatchDog Timer
255 levels timer interval, from 1 to 255 sec or min
setup by software, jumperless selection, generates
system reset
Expansion Interface Support PCI & ISA interface
MIO 2 x EIDE (UDMA 66), 1x LPT/FDD (shared), 1 x K/B,
1 x Mouse, 2 x RS232
IrDA 115 Kbps, IrDA 1.1 compliant.
USB 4 USB 2.0 compliant ports
Ethernet Intel 82562EZ, IEEE 802.3u 100Base-T compatible Built-in
boot ROM in Flash BIOS
CRT Display mode Pixel resolution up to 1600 x 1200 at 85 Hz and
2048 x 1536 at 75 Hz
LCD Display mode Dual channel LVDS panel supports up to UXGA panel
resolution with frequency range from 25 MHz to 112 MHz
Dimensions (L x W) 95 x 114 (3.74" x 4.5")
Power Supply Voltage +5 V power only
Power Requirement Max: +5 V @ 4 A, Typical: +5 V @ 2.8 A (Pentium M 1.1 G,
256 MB DDR 333)
Operating Temperature 0 ~ 60˚C (32 ~ 140˚F)
Operating Humidity 0% ~ 90% relative humidity, non-condensing
Chapter 2 SOM-ETX Overview 15

Advantech SOM-ETX Design Guide
2.2.2 SOM-4486
Advantech’s new SOM-4486 is a Celeron® M grade, fanless SOM-ETX
CPU module able to drive the most demanding embedded applications
requiring performance CPU calculating & graphics support. With support
for Intel® Celeron® M 600MHz processors, the SOM-4486 offers
developers a low power consumption and still keep system performance
demand. The Intel® 852GM/ICH4 core chipset is a high performance 3D
4x AGP Graphics engine, giving any platform superior multimedia
capability & USB2.0 supporting providing the stable and reliable on whole
system architecture.
(W83627HF)
Mic
DDR SDRAM
(Up to 1GB)
FWH
(732 uFCBGA)
Analog RGB
Intel ICH4
AC-Link
Codec
DDR266/DDR333
COM1/COM2
LPT/FLOPPY
PCI BUS
AC'97
Intel GMCH
(ALC202)
Dual channel LVDS
(82801DB)
Hub I/F 266MB/s
LPC Super I/O
Intel Celeron M
LPC BUS
Line-In
(421BGA)
PRIMARY IDE
PS/2 KB&MS
(852GM)
Line-Out
SECONDARY IDE
400MHz PSB
IRDA
200pin SODIMM x 1
USB 2.0 x 4
ISA BUS
(W83628F/W83629D)
PCI-ISA Bridge
Ethernet
10/100 LAN
(82562EZ)
LCI BUS
600MHz W/O L2
Figure 2-5 SOM-4486 Block Diagram
16 Chapter 2 SOM-ETX Overview

Advantech SOM-ETX Design Guide
SOM-4486 Main Features:
• Embedded Intel® Celeron M processor
• Supports DDR Memory
• Supports 4 ports host USB 2.0
• Supports up to dual channel LVDS panels
Table 2.3 SOM-4486 Specifications
Item Description
CPU Embedded Intel Celeron M processor w/64KB primary cache memory
System Memory 1 x 200 pin SO-DIMM sockets, support ECC Double
DataRate (DDR)128 MB to 1 GB, accept 128/256/512/
1000 MB DR200/266/333 DRAM.
System Chipset Intel 852GM GMCH/ ICH4 Chipset 400 MHz FSB
BIOS AWARD 4 Mbit Flash BIOS
WatchDog Timer 255 levels timer interval, from 1 to 255 sec or min
setup by software, jumperless selection, generates
system reset
Expansion Interface Support PCI & ISA interface
MIO 2 x EIDE (UDMA 66), 1x LPT/FDD (shared), 1 x K/B,
1 x Mouse, 2 x RS232
IrDA 115 Kbps, IrDA 1.1 compliant.
USB 4 USB 2.0 compliant ports
Ethernet Intel 82562EZ, IEEE 802.3u 100Base-T compatible Built-in boot ROM in
Flash BIOS
CRT Display mode Pixel resolution up to 1600 x 1200 at 85 Hz and
2048 x 1536 at 75 Hz
LCD Display mode
Dual channel LVDS panel supports up to UXGA panel
resolution with frequency range from 25 MHz to 112 MHz
Dimensions (L x W) 95 x 114 (3.74" x 4.5")
Power Supply Voltage +5 V power only
Power Requirement Max: +5 V @ 4 A, Typical: +5 V @ 2.8 A (Pentium M 1.1 G, 256 MB
DDR 333)
Operating Temperature 0 ~ 60˚C (32 ~ 140˚F)
Operating Humidity 0% ~ 90% relative humidity, non-condensing
Chapter 2 SOM-ETX Overview 17

Advantech SOM-ETX Design Guide
2.2.3 SOM-4475
Advantech's new SOM-4475 is a powerful, fanless SOM-ETX CPU module able to
drive the most demanding Kiosk, POS and POI applications requiring high
performance graphics support. With support for Intel® Mobile Pentium® III and
Celeron® processors up to 933 MHz, the SOM-4475 offers developers a low power
and scaleable solution that fits a range of needs. The VIA VT8606/VT82C686A core
chipset is a high performance 3D 4x AGP Graphics engine, giving any platform
superior multimedia capability.
FWH
Ethernet
(RTL8139C)
10/100 LAN
USB 1.1 x 4
SDRAM
Mic
(Up to 512MB)
AC-Link
VIA Super SB
Analog RGB
PC133/PC100
Codec
COM1/COM2
LPT/FLOPPY
AC'97
VIA TwisterT NB
(ALC201)
(VT82C686B)
Dual channel LVDS
PCI Bus
Intel LV Pentium III/
Intel ULV Celeron
Line-In
PRIMARY IDE / ATA100
(VT8606)
PS/2 KB&MS
Line-Out
SECONDARY IDE / ATA100
133/100/66MHz FSB
IRDA
144pin SODIMM x 1
Composite/S-Video
(VT1621)
TV-Out
PCI BUS
WatchDog
(XC9536 CPLD)
ISA Bus
Figure 2-6 SOM-4475 Block Diagram
18 Chapter 2 SOM-ETX Overview

Advantech SOM-ETX Design Guide
SOM-4475 Main Features:
• Embedded LV Intel® Pentium® III/ULV Celeron® processor
• Fanless, 0 ~ 60° C operation (SOM-4475F-J0A1 & SOM-4475FL-J0A1)
• Powerful multimedia capability
• 18-bit LCD/ 2-channel LVDS interface
Table 2.4 SOM-4475 Specifications
Item Description
CPU LV Intel Pentium III-933 MHz/ ULV Celeron-650 400Mhz
System Memory SDRAM SO-DIMM x 1, Max. 512 MB (optional 1 GB)
2nd Cache Memory 512KB on PIII and 256KB on Celeron CPU
System Chipset VIA 8606 (Twister T)/ 82C686
BIOS AWARD 256 KB Flash BIOS
WatchDog Timer 1 - 62 sec, system reset
Audio VT 82C686 supports AC’97 2.0 compliant, Mic in, Line in, Line
out
MIO 2 x EIDE (Ultra DMA66), 1 x FDD/LPT, 1 x K/B,1 x Mouse, 2 x
RS-232
IrDA 115 Kbps, IrDA 1.1 compliant
USB 4 USB ports, USB 1.1 compliant
Ethernet RTL 8139, IEEE 802.3u 100BASE-T Fast Ethernet, Built-in boot
ROM
Chipset VIA Twister chip with Integrated S3 Savage4 2D/3D/Video
Accelerator
Resolution
CRT Mode: 1280 x 1024 @ 16 bpp (60 Hz),1024 x 768 @ 16
bpp (85 Hz) LCD/Simultaneous Mode: 1280 x 1024 @ 16 bpp
(60 Hz), 1024 x 768 @ 16 bpp (60 Hz)
LCD Interface 4X AGP VGA/LCD interface. Support 18-bit TFT panels up to
XGA resolution
LVDS Interface 2 Channel (2x 18-bit) LVDS interface
Dimensions (L x W) 95 x 114 mm (3.7” x 4.5”)
Power Supply Voltage + 5 V ± 5%
Power Requirement
Max:4.6 A @ 5 V
Typical 3.41 A @ 5 V (PIII 933 MHz + 256 MB DRAM)
Typical 2.95 A @ 5 V (Celeron 650 MHz + 256 MB RAM)
Operating Temperature 0 ~ 60° C (32 ~ 140° F)
Operating Humidity 0% ~ 90% relative humidity, non-condensing system
Chapter 2 SOM-ETX Overview 19

Advantech SOM-ETX Design Guide
2.2.4 SOM-4472
Advantech's new SOM-4472 is a new SOM-ETX form factor with an onboard new
VIA Embedded C3 LP 1000 or Eden 667/400 MHz processor. The VIA Eden
processor uses advanced 0.13µ CMOS technology with 128KB L1 cache memory
and 64KB L2 cache memory on die. This board can operate without a fan at
temperatures up to 60° C (140° F) and typically consumes fewer than 14 Watts while
supporting numerous peripherals. This SOM-ETX includes a 4X AGP controller, a
PCI audio interface, a PCI Ethernet interface, and 2 channel LVDS interface. Other
on-board features include an LPT, 4 USBs, IrDA and 2 serial ports: 2 RS-232s.
FWH
Ethernet
(RTL8139C)
10/100 LAN
USB 1.1 x 4
SDRAM
Mic
(Up to 512MB)
AC-Link
VIA Super SB
Analog RGB
PC133/PC100
Codec
COM1/COM2
LPT/FLOPPY
VIA TwisterT NB
AC'97
Dual channel LVDS
(ALC202)
(VT82C686B)
VIA Eden/C3 Processor
PCI Bus
Line-In
PRIMARY IDE / ATA100
(VT8606)
PS/2 KB&MS
SECONDARY IDE / ATA100
Line-Out
133/100/66MHz FSB
IRDA
144pin SODIMM x 1
Composite/S-Video
(VT1622)
TV-Out
PCI BUS
(XC9536 CPLD)
WatchDog
ISA Bus
Figure 2-7 SOM-4472 Block Diagram
20 Chapter 2 SOM-ETX Overview