VersaLogic Iguana VL-EPIC-25 User manual

Reference
Manual
DOC. REV. 12/6/2013
Iguana
(VL-EPIC-25)
Intel® Atom-based SBC with
Ethernet, SATA, USB, eUSB,
CompactFlash, mSATA, Serial,
Industrial I/O, and SPX™

VL-EPIC-25 Reference Manual ii
WWW.VERSALOGIC.COM
12100 SW Tualatin Road
Tualatin, OR 97062-7341
[phone]
Fax [phone]
Copyright © 2013 VersaLogic Corp. All rights reserved.
Notice:
Although every effort has been made to ensure this document is error-free, VersaLogic makes no
representations or warranties with respect to this product and specifically disclaims any implied warranties
of merchantability or fitness for any particular purpose.
VersaLogic reserves the right to revise this product and associated documentation at any time without
obligation to notify anyone of such changes.
PC/104 and the PC/104 logo are trademarks of the PC/104 Consortium.

VL-EPIC-25 Reference Manual iii
Product Revision Notes
Revsion 1.00–Commercial release.
Support
The Iguana support page, at http://www.versalogic.com/private/iguanasupport.asp, contains additional
information and resources for this product including:
Reference Manual (PDF format)
Device drivers
Data sheets and manufacturers’ links for chips used in this product
Photograph of the circuit board
BIOS and PLD information and upgrades
This is a private page for Iguana users that can be accessed only by entering this address directly. It cannot
be reached from the VersaLogic homepage.
The VersaTech KnowledgeBase is an invaluable resource for resolving technical issues with your
VersaLogic product.
VersaTech KnowledgeBase

VL-EPIC-25 Reference Manual iv
Contents
Introduction ...................................................................................................................1
Description.......................................................................................................................... 1
Features and Construction.....................................................................................1
Technical Specifications.....................................................................................................2
Block Diagram....................................................................................................................3
Thermal Considerations......................................................................................................4
CPU Die Temperature ...........................................................................................4
Model Differences.................................................................................................4
RoHS Compliance ..............................................................................................................5
About RoHS...........................................................................................................5
Warnings.............................................................................................................................5
Electrostatic Discharge..........................................................................................5
Lithium Battery......................................................................................................5
Handling Care........................................................................................................ 6
Technical Support...............................................................................................................6
Repair Service........................................................................................................6
Configuration and Setup...............................................................................................8
Initial Configuration ...........................................................................................................8
Basic Setup ......................................................................................................................... 8
Operating System Installation........................................................................................... 10
BIOS Setup Screens.......................................................................................................... 10
Physical Details...........................................................................................................11
Dimensions and Mounting................................................................................................ 11
Iguana Dimensions ..............................................................................................11
VL-CBR-5013 Dimensions .................................................................................12
VL-CBR-4004 Dimensions .................................................................................13
Hardware Assembly.............................................................................................14
Standoff Locations...............................................................................................14
External Connectors ......................................................................................................... 15
Iguana Connector Locations –Top......................................................................15
Iguana Connector Locations –Bottom................................................................16
Iguana Connector Functions and Interface Cables..............................................17
VL-CBR-5013 Connector Locations...................................................................18
VL-CBR-5013 Connector Functions...................................................................18
VL-CBR-4004 Connector Locations...................................................................19
Jumper Blocks ..................................................................................................................20
Jumpers As-Shipped Configuration.....................................................................20
Jumper Summary.................................................................................................21
System Features..........................................................................................................22
Power Supply....................................................................................................................22
Power Connectors................................................................................................22

Contents
VL-EPIC-25 Reference Manual v
Power Requirements............................................................................................22
Power Delivery Considerations...........................................................................23
Lithium Battery....................................................................................................23
CPU...................................................................................................................................24
System RAM.....................................................................................................................25
Clearing Non-volatile RAM (NVRAM)...........................................................................25
Real-Time Clock (RTC) ...................................................................................................25
Setting the Clock..................................................................................................25
Clearing the Real-Time Clock.............................................................................26
Console Redirection ......................................................................................................... 26
Interfaces and Connectors .........................................................................................27
Expansion Buses...............................................................................................................27
PC/104-Plus (PCI + ISA) and PCI-104 (PCI Only)............................................27
PC/104 ISA.......................................................................................................... 27
PC/104 I/O Support .............................................................................................28
PC/104 Memory Support..................................................................................... 28
PC/104 IRQ Support............................................................................................28
Ethernet Interface..............................................................................................................29
Ethernet Connectors ............................................................................................29
Ethernet Status LEDs...........................................................................................29
Status LED...........................................................................................................30
SATA Interface.................................................................................................................30
Serial Ports........................................................................................................................31
COM Port Configuration.....................................................................................31
RS-485 Mode Line Driver Control......................................................................31
Serial Port Connectors.........................................................................................32
USB Interface ...................................................................................................................32
Flash Interfaces.................................................................................................................33
CompactFlash......................................................................................................33
eUSB Socket........................................................................................................ 33
PCIe Mini Card / mSATA Socket .......................................................................33
PCIe Mini Card Wireless Status LEDs................................................................ 35
Video................................................................................................................................. 36
SVGA Output Connector.....................................................................................36
LVDS Flat Panel Display Connector...................................................................37
Audio ................................................................................................................................38
User I/O Connector...........................................................................................................39
Pushbutton Reset ..............................................................................................................40
Power Button....................................................................................................................40
Supported Power States....................................................................................... 40
External Speaker...............................................................................................................41
LEDs.................................................................................................................................41
Programmable LED.............................................................................................41
Power LED ..........................................................................................................41
Digital I/O.........................................................................................................................42
Digital I/O Port Configuration Using the SPI Interface ......................................42
Analog Input ..................................................................................................................... 47
External Connections...........................................................................................47

Contents
VL-EPIC-25 Reference Manual vi
Analog Input Using the SPI Interface..................................................................47
Analog Output ..................................................................................................................49
Counter / Timers...............................................................................................................50
SPX...................................................................................................................................51
VersaLogic SPX Expansion Modules .................................................................52
SPI Registers........................................................................................................53
System Resources and Maps.....................................................................................56
Legacy Memory Map........................................................................................................56
I/O Map.............................................................................................................................56
Special Registers ........................................................................................................57
PLED and Product Code Register ....................................................................................57
PLD Revision and Type Register .....................................................................................58
BIOS and Jumper Status Register.....................................................................................59
Appendix A –References............................................................................................60
Appendix B –Custom Programming .........................................................................61
PLD Interrupts ..................................................................................................................61
Interrupt Control Register....................................................................................61
Interrupt Status Register......................................................................................62
8254 Timer Control Register............................................................................................63
A/D and D/A Control/Status Register ..............................................................................64

VL-EPIC-25 Reference Manual 1
Introduction
Description
FEATURES AND CONSTRUCTION
The Iguana (VL-EPIC-25) is a feature-packed single board computer (SBC). It is designed for
OEM control projects requiring compact size, high reliability, and longevity (product lifespan).
Its features include:
Intel Atom D425 Single Core or D525
Dual Core processor with ICH8M I/O
hub
Up to 2GB of DDR3 via a single SO-
DIMM
Dual Gigabit Ethernet
PC/104-Plus expansion
Eight USB 1.1/2.0 channels: two
(Type A) on-board, four (Type A) on
the paddleboard, one to the PCIe Mini
Card, and one to the eUSB interface
Industrial I/O
Eight 12-bit analog inputs
Four 12-bit analog outputs
Sixteen digital I/O lines
Three SATA 2.5 ports: two on-board
vertical latching connectors, one port
to the mSATA port
Four serial ports: RS-232/422/485
Flash interfaces: eUSB, PCIe Mini
Card/mSATA SSD, CompactFlash
RoHS-compliant
Extended temperature options
Integrated high performance video with
simultaneous, independent analog and
FPD output capability
Intel 3rd generation graphics core
24-bit VGA up to 2048x1536
18-bit LVDS up to 1366x768
SPX interface supports up to four
external SPI devices either of user
design or any of the SPX™ series of
expansion boards, with clock
frequencies from 1-8 MHz
Two 16-bit counter/timers (standard);
three 8254 Programmable Interval
Timers (custom)
TVS devices for ESD protection
Watchdog timer
Field upgradeable UEFI BIOS with
OEM enhancements
Customization available
The Iguana is compatible with popular operating systems such as Windows CE, Windows XP
Professional/XP Embedded (SP3), Linux, VxWorks, and QNX (see the VersaLogic OS
Compatibility Chart). Note: Windows 7 will not install with less than 512 MB RAM.
The Iguana features high reliability design and construction, including voltage sensing reset
circuits and self-resetting fuses on the power supplies to the user I/O connectors.
Iguana boards are subjected to 100% functional testing and are backed by a limited two-year
warranty. Careful parts sourcing and US-based technical support ensure the highest possible
quality, reliability, service, and product longevity for this exceptional SBC.
11

Introduction
VL-EPIC-25 Reference Manual 2
Technical Specifications
Specifications are typical at 25°C with +5V supply unless otherwise noted. Specifications are
subject to change without notification.
Board Size:
4.5" x 6.5" (EPIC standard)
Storage Temperature:
-40° to +85°C
Operating Temperature:
VL-EPIC-25SA, SB, with heatsink: 0° to +60°C
VL-EPIC-25EA, RA1, RB1with fan, heatsink:
-40° to +85°C
Power Requirements: at +25°C with +5V supply
running Windows XP with 2 GB RAM, LVDS display,
SATA, GbE, and USB keyboard/mouse
VL-EPIC-25SA: 1.68A (8.40W) idle,1.82A
(9.1W) typical, 1.94A (9.7W) max.
VL-EPIC-25SB: 2.08A (10.40W) idle, 2.34A
(11.7W) typical,2.58A (12.9W) max
VL-EPIC-25EA, RA: 1.88A (9.40W) idle, 2.02A
(10.1W) typical, 2.14A (10.7W) max.
VL-EPIC-25RB: 2.28A (11.4W) idle, 2.54A
(12.7W) typical, 2.78A (13.9W) max.
+3.3V or ±12V may be required by some
expansion modules
System Reset:
Input power sensing, resets below 4.70V typ.
Watchdog timeout (warm/cold reset)
DRAM: One SO-DIMM socket, up to 2GB of DDR3
DRAM
Video Interface:
Intel 3rd generation graphic core, 400 MHz
18-bit LVDS interface
VGA –2048x1536 with 24-bit color
LVDS –1355x768 with 18-bit color
SATA Interface:
Three SATA 2.5 ports: two on-board vertical
latching connectors, one port to the mSATA port
Flash Storage:
eUSB site
PCIe Mini Card/mSATA site
CompactFlash socket
Ethernet Interface:
Two Intel 82574IT based 10BaseT / 100BaseTX
/ 1000BaseT Ethernet Controllers
USB: Eight host USB channels: two on-board Type A
connectors, four Type A connectors on VL-CBR-
5013 paddleboard, one on Mini PCIe connector,
1 on eUSB header
Serial Ports 0-1:
RS-232/422/485, 16C550 compatible, 460 Kbps
max., 4-wire RS-232 (CTS and RTS
handshaking), DB-9 connector on VL-CBR-5013
paddleboard
Serial Ports 2-3:
RS-232/422/485, 16C550 compatible, 460 Kbps
max., 4-wire RS-232 (CTS and RTS
handshaking), terminal block on VL-CBR-5013
paddleboard
Analog Input:
8-channel, 12-bit, single-ended, 100 Ksps,
channel independent input range: bipolar ±5,
±10, or unipolar 0 to +5V or 0 to +10V
Analog Output:
4-channel, 12-bit, single-ended, 100 Ksps
0V to 4.096V
Digital Interface:
16-channel, ±24 mA outputs, 3.3V signaling
SPX: Supports four external SPI chips of user design
or any SPX series expansion board
Audio: Stereo HD audio line in/out
BIOS:
AMI UEFI BIOS with OEM enhancements, field
programmable.
Bus Speed:
PC/104-Plus (PCI): 33.33 MHz
PC/104 (ISA): 8.33 MHz
Compatibility:
PC/104 - Full compliance
Weight:
VL-EPIC-25SA - 0.645 lbs (0.293 kg)
VL-EPIC-25SB - 0.662 lbs (0.300 kg)
VL-EPIC-25EA - 0.701 lbs (0.318 kg)
1. Special order. Ruggedized Ethernet and user I/O connectors.

Introduction
VL-EPIC-25 Reference Manual 3
Block Diagram
Power
Input
Regulators
Includes Power Mgt &
Sequencing Logic
18-bit LVDS
Panel
VGA
On-Board
Peripheral
Intel Atom
Processor
D425 (1 core)
D525 (2 core)
DDR3
SO-DIMM
CK505 Clock
Generation
E-Mux
PCIe Mini
Card or
mSATA
eUSB Flash
Module
Conn.
Mag
Conn.
Mag
Ethernet 0
GigE MAC/PHY
Ethernet 1
GigE MAC/PHY
Compact
Flash
Socket
PC/104-Plus (PCI)
PC/104 (ISA)
ITE PCI-ISA
Bridge
Pri.
Sec.
LPC-SPI Bridge
& 8254 Timers
(Actel FPGA)
Digital I/O (16)
Analog Input (8)
Analog Output (4)
SPX
Fan
Super I/O
Tach
HD Audio &
Speaker Driver
Audio Jacks
& Speaker
Reset
Button
Power
Button
PLED
LVDS
RGB
Key:
DDR3
SMB
Electronic Mux
SMB
PCIe/SATA
SMB
USB 2.0
RTC
Monitor
Serial
SPI SS0/1/2/3
LPC
LPC
4 Timer I/Os (CTC)
SPI Boot Flash
PC/104
PCI
Intel 82574IT
Intel 82574IT
PCIe x1 [6]
PCIe x1 [4,5]
SATA 0
SATA 1
PCIe x1 [1]
PCIe x1 [2]
IDE I/F
PCI32
SATA 2
PCIe x1 [3]
SMB
GPIO
USB 8
USB 9
USB 0-1
USB 2-3
USB 4-7
HDA
LPC
Intel 82801HM
I/O Controller
(ICH8M)
4xDMI Gen 1
(FSB)
N/C
RST_BTN# PWR_BTN#
(on heat sink)
Batt
USB0 USB2
2.0 2.0
X
Serial Serial
COM0 COM2
Serial Serial
COM1 COM3
USB4 USB6
2.0 2.0
USB5 USB7
2.0 2.0
SATA0
Connector
SATA1
Connector
X
X
N/C
N/C
SPI
VL-CBR-4004
VL-CBR-5013
SPI I/F

Introduction
VL-EPIC-25 Reference Manual 4
Thermal Considerations
CPU DIE TEMPERATURE
The CPU die temperature is affected by numerous conditions, such as CPU utilization, CPU
speed, ambient air temperature, air flow, thermal effects of adjacent circuit boards, external heat
sources, and many others.
The CPU is protected from over-temperature conditions by two mechanisms.
The CPU will automatically slow down by 50% whenever its die temperature exceeds +100°C.
When the temperature falls back below +100°C, the CPU resumes full-speed operation.
As a failsafe, if the CPU die temperature climbs above +105°C, the CPU will turn itself off to
prevent damage to the chip.
MODEL DIFFERENCES
VersaLogic offers both commercial and industrial temperature models of the VL-EPIC-25. The
basic operating temperature specification for both models is shown below.
VL-EPIC-25SA and SB: 0°C to +60°C free air, no airflow, heatsink, no fan
VL-EPIC-25EA, RA, and RB: -40°C to +85°C free air, heatsink, fan

Introduction
VL-EPIC-25 Reference Manual 5
RoHS Compliance
The Iguana is RoHS-compliant.
ABOUT ROHS
In 2003, the European Union issued Directive 2002/95/EC regarding the Restriction of the use of
certain Hazardous Substances (RoHS) in electrical and electronic equipment.
The RoHS directive requires producers of electrical and electronic equipment to reduce to
acceptable levels the presence of six environmentally sensitive substances: lead, mercury,
cadmium, hexavalent chromium, and the presence of polybrominated biphenyls (PBB) and
polybrominated diphenyl ethers (PBDE) flame retardants, in certain electrical and electronic
products sold in the European Union (EU) beginning July 1, 2006.
VersaLogic Corp. is committed to supporting customers with high-quality products and services
meeting the European Union’s RoHS directive.
Warnings
ELECTROSTATIC DISCHARGE
Warning! Electrostatic discharge (ESD) can damage circuit boards, disk drives, and other
components. The circuit board must only be handled at an ESD workstation. If an
approved station is not available, some measure of protection can be provided by
wearing a grounded antistatic wrist strap. Keep all plastic away from the board,
and do not slide the board over any surface.
After removing the board from its protective wrapper, place the board on a
grounded, static-free surface, component side up. Use an antistatic foam pad if
available.
The board should also be protected inside a closed metallic antistatic envelope
during shipment or storage.
Note: The exterior coating on some metallic antistatic bags is sufficiently conductive to
cause excessive battery drain if the bag comes in contact with the bottom side of
the Iguana.
LITHIUM BATTERY
Warning! To prevent shorting, premature failure, or damage to the lithium battery, do not
place the board on a conductive surface such as metal, black conductive foam, or
the outside surface of a metalized ESD protective pouch. The lithium battery may
explode if mistreated. Do not recharge, disassemble, or dispose of in fire. Dispose
of used batteries promptly and in an environmentally suitable manner.

Introduction
VL-EPIC-25 Reference Manual 6
HANDLING CARE
Warning! Care must be taken when handling the board not to touch the exposed circuitry
with your fingers. Though it will not damage the circuitry, it is possible that small
amounts of oil or perspiration on the skin could have enough conductivity to cause
the Real Time Clock to become corrupted through careless handling.
Technical Support
If you are unable to solve a problem after reading this manual, please visit the Iguana product
support Web page below. The support page provides links to component datasheets, device
drivers, and BIOS and PLD code updates.
The VersaTech KnowledgeBase contains a wealth of technical information about VersaLogic
products, along with product advisories. Click the link below to see all KnowledgeBase articles
related to the VL-EPIC-25.
If you have further questions, contact VersaLogic Technical Support at [phone].
VersaLogic support engineers are also available via e-mail at [e-mail].
REPAIR SERVICE
If your product requires service, you must obtain a Returned Material Authorization (RMA)
number by calling [phone].
Please provide the following information:
Your name, the name of your company, your phone number, and e-mail address
The name of a technician or engineer that can be contacted if any questions arise
Quantity of items being returned
The model and serial number (barcode) of each item
A detailed description of the problem
Steps you have taken to resolve or recreate the problem
The return shipping address
Warranty Repair All parts and labor charges are covered, including return shipping
charges for UPS Ground delivery to United States addresses.
Iguana Support Page
http://www.versalogic.com/private/iguanasupport.asp
VersaTech KnowledgeBase

Introduction
VL-EPIC-25 Reference Manual 7
Non-warranty Repair All approved non-warranty repairs are subject to diagnosis and labor
charges, parts charges, and return shipping fees. Please specify the
shipping method you prefer and provide a purchase order number for
invoicing the repair.
Note: Please mark the RMA number clearly on the outside of the box before
returning.

VL-EPIC-25 Reference Manual 8
Configuration and Setup
Initial Configuration
The following components are recommended for a typical development system with the Iguana:
ATX power supply
DDR3 DRAM module
USB keyboard and mouse
SATA hard drive
USB CD-ROM drive
LVDS or VGA display
The following VersaLogic cables are recommended:
VL-CBR-2022 –Power adapter cable
VL-CBR-5013 –Paddleboard
VL-CBR-0701 –SATA data cable
LVDS or VGA video adapter cable
You will also need an operating system (OS) installation CD-ROM.
Basic Setup
The following steps outline the procedure for setting up a typical development system. The
Iguana should be handled at an ESD workstation or while wearing a grounded antistatic wrist
strap.
Before you begin, unpack the Iguana and accessories. Verify that you received all the items you
ordered. Inspect the system visually for any damage that may have occurred in shipping. Contact
[email protected] immediately if any items are damaged or missing.
Gather all the peripheral devices you plan to attach to the Iguana and their interface and power
cables.
It is recommended that you attach standoffs to the board (see Hardware Assembly) to stabilize
the board and make it easier to work with.
Figure 1 shows a typical start-up configuration.
22

Configuration and Setup
VL-EPIC-25 Reference Manual 9
Figure 1. Typical Start-up Configuration
1. Install Memory
Insert a DDR3 DRAM module into SO-DIMM socket J1 on the bottom of the board and
latch it into place.
2. Attach Cables and Peripherals
Plug the appropriate video cable into the LVDS connector (J3) or the VGA connector
(J2) and attach the monitor.
ATX
Power Supply
SVGA or LVDS
USB Keyboard
and USB Mouse
USB CD-
ROM Drive
OS Installation
CD-ROM
IGUANA
VL-EPIC-25
VL-CBR-2022
J29
VL-CBR-0701
VL-CBR-5013B
J4
J19
J7
J1
J3
J16
J17
J11
J12
VL-CBR-2010 or
VL-CBR-2011
VL-CBR-5013A
SATA
Hard Drive
VL-CBR-0401
J1
J2
VL-CBR-1201
SVGA
or
LVDS

Configuration and Setup
VL-EPIC-25 Reference Manual 10
Plug the VL-CBR-5013A cable into the user I/O connector (J19) on the Iguana and the
VL-CBR-5013B paddleboard (the cable is shipped attached to the paddleboard).
Plug a USB keyboard and mouse into USB sockets J1 or J7 of the paddleboard.
Plug the SATA data cable VL-CBR-0701 into socket J11 or J12. Attach a hard drive to
the cable.
Attach the ATX SATA power cable (VL-CBR-0401) to the ATX power supply and the
SATA hard drive.
Plug a USB CD-ROM drive into a USB socket J16 or J17.
Attach an ATX power cable to any 3.5” drive that is not already attached to the power
supply (hard drive or CD-ROM drive).
3. Attach Power
Plug the power adapter cable VL-CBR-2022 into socket J29. Attach the motherboard
connector of the ATX power supply to the adapter.
4. Review Configuration
Before you power up the system, double check all the connections. Make sure all cables
are oriented correctly and that adequate power will be supplied to the Iguana and
peripheral devices.
5. Power On
Turn on the ATX power supply and the video monitor. If the system is correctly
configured, a video signal should be present. (There might be a delay of several seconds
before the video signal becomes present.) If video does not appear, press the Power
Button on the paddleboard.
6. Install Operating System
Install the OS according to the instructions provided by the OS manufacturer.
Note:If you intend to operate the Iguana under Windows XP or Windows XP
Embedded, be sure to use Service Pack 3 (SP3) for full support of the latest device
features.
Operating System Installation
The standard PC architecture used on the Iguana makes the installation and use of most of the
standard x86-based operating systems very simple. The operating systems listed on the
VersaLogic OS Compatibility Chart use the standard installation procedures provided by the
maker of the OS. Special optimized hardware drivers for a particular OS, or a link to the drivers,
are available at the Iguana Product Support web page.
BIOS Setup Screens
See KnowledgeBase article VT1701 - BIOS Setup Reference for complete information on how to
configure the Iguana BIOS.

VL-EPIC-25 Reference Manual 11
Physical Details
Dimensions and Mounting
IGUANA DIMENSIONS
The VL-EPIC-25 complies with EPIC dimensional standards. Dimensions are given below to
help with pre-production planning and layout.
Figure 2. Iguana Dimensions and Mounting Holes
(Not to scale. All dimensions in inches.)
33
6.096
4.128 4.328
2.596
5.496
-0.200
5.596
2.446
0.000
3.375
-0.200
0.000

Physical Details
VL-EPIC-25 Reference Manual 12
VL-CBR-5013 DIMENSIONS
Figure 3. VL-CBR-5013 Dimensions and Mounting Holes
(Not to scale. All dimensions in inches.)
1.95
1.57
5.50
5.10
1.17
1.24
0.065

Physical Details
VL-EPIC-25 Reference Manual 13
VL-CBR-4004 DIMENSIONS
Figure 4. VL-CBR-4004 Dimensions and Mounting Holes
(Not to scale. All dimensions in inches.)
J1 J2 J3 J4
J6 J7 J8 J9
J5
+
+
+
+
2.38
2.87
0.25
0.25
0.40
1.95
0.70
0.63
0.62
0.06

Physical Details
VL-EPIC-25 Reference Manual 14
HARDWARE ASSEMBLY
The Iguana uses PC/104 and PC/104-Plus connectors so that expansion modules can be added to
the top of the stack. PC/104 (ISA) modules must not be positioned between the Iguana and any
PC/104-Plus (PCI) modules on the stack.
The entire assembly can sit on a table top or be secured to a base plate. When bolting the unit
down, make sure to secure all eight standoffs (A and B) to the mounting surface to prevent
circuit board flexing. Four standoffs (B) must be used under the stack. These are secured with
four male-female standoffs (C), threaded from the top side, which also serve as mounting struts
for the PC/104 stack. Standoffs are secured to the top circuit board using pan head screws. Four
standoffs and screws are available as part number VL-HDW-106.
Note: A minimum height clearance of 8.5mm is required beneath the board to avoid
contacting the tallest component (the CompactFlash socket) with the enclosure or
other components.
An extractor tool is available (part number VL-HDW-203) to separate the PC/104 modules from
the stack. Use caution when using the extractor tool not to damage any board components.
STANDOFF LOCATIONS
Figure 5. Stack Arrangement Example
A
B
C