PICO epia-p820 User manual

user manual
EPIA-P820
Pico-ITX Mainboard
Revision
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2010
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II
Copyright and Trademarks
Copyright © 2010 VIA Technologies Incorporated. All rights reserved.
No part of this document may e reproduced, transmitted, transcri ed, stored in a
retrieval system, or translated into any language, in any form or y any means, electronic,
mechanical, magnetic, optical, chemical, manual or otherwise without the prior written
permission of VIA Technologies, Incorporated.
All trademarks are the property of their respective holders.
PS/2 is a registered trademark of IBM Corporation.
Disclaimer
No license is granted, implied or otherwise, under any patent or patent rights of VIA
Technologies. VIA Technologies makes no warranties, implied or otherwise, in regard to
this document and to the products descri ed in this document. The information provided
in this document is elieved to e accurate and relia le as of the pu lication date of this
document. However, VIA Technologies assumes no responsi ility for the use or misuse of
the information in this document and for any patent infringements that may arise from the
use of this document. The information and product specifications within this document are
su ject to change at any time, without notice and without o ligation to notify any person
of such change.
Regulatory Compliance
FCC-A Radio Frequency Interference Statement
This equipment has een tested and found to comply with the limits for a class A digital
device, pursuant to part 15 of the FCC rules. These limits are designed to provide
reasona le protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case the user will e
required to correct the interference at his personal expense.
Notice
The changes or modifications not expressly approved y the party responsi le for
compliance could void the user's authority to operate the equipment.
Notice 2
Shielded interface ca les and A.C. power cord, if any, must e used in order to comply
with the emission limits.
Battery Recycling and Disposal
Only use the appropriate attery specified for this product.
Do not re-use, recharge, or reheat an old attery.
Do not attempt to force open the attery.
Do not discard used atteries with regular trash.
Discard used atteries according to local regulations.
Tested To Comply
With FCC Standards
FOR HOME OR OFFICE USE

III
Safety Precautions
Do’s
oAlways read the safety instructions carefully.
oKeep this User's Manual for future reference.
oAll cautions and warnings on the equipment should e
noted.
oKeep this equipment away from humidity.
oLay this equipment on a relia le flat surface efore setting
it up.
oMake sure the voltage of the power source and adjust
properly 110/220V efore connecting the equipment to the
power inlet.
oPlace the power cord in such a way that people cannot
step on it.
oAlways unplug the power cord efore inserting any add-on
card or module.
oIf any of the following situations arises, get the equipment
checked y authorized service personnel:
oThe power cord or plug is damaged.
oLiquid has penetrated into the equipment.
oThe equipment has een exposed to moisture.
oThe equipment has not worked well or you cannot
get it work according to User's Manual.
oThe equipment has dropped and damaged.
oThe equipment has o vious sign of reakage.
Don’ts
oDo not leave this equipment in an environment
unconditioned or in a storage temperature a ove 70°C
(158°F). The equipment may e damaged.
oDo not leave this equipment in direct sunlight.
oNever pour any liquid into the opening. Liquid can cause
damage or electrical shock.
oDo not place anything over the power cord.
oDo not cover the ventilation holes. The openings on the
enclosure protect the equipment from overheating

IV
Box Contents
 1 x EPIA-P820 Pico-ITX main oard
 1 x P720-A I/O module oard
 1 x SATA ca le
 1 x SATA power ca le
 1 x DC-In ca le
 1 x Driver utility CD

V
T ABLE OF C ONTENTS
1 Product Overview............................................................................................... 1
Key Components ................................................................................................. 2
VIA Nano 1.2 GH NanoBGA2 Processor ........................................ 2
VIA VX855 Media System Processor..................................................... 2
Mainboard Specifications ................................................................................ 3
EPIA-P820 Layout ................................................................................................ 4
Top Side .............................................................................................................. 4
Bottom Side....................................................................................................... 5
P720-A I/O Module Layout............................................................................ 6
Front View......................................................................................................... 6
Top View ............................................................................................................ 6
Bottom View..................................................................................................... 6
Development Kit Accessories ........................................................................ 7
DC-In Cable....................................................................................................... 7
Power Brick........................................................................................................ 7
2 Onboard Connectors, Slots and Pin Headers....................................... 9
Top Side Connectors .......................................................................................10
VIA Nano 1.2 GH processor with Heatsink ........................................10
System Fan connector: FAN1 ................................................................10
DC-In Power connector: PWR1 ............................................................11
Serial ATA Power connector: PWR2...................................................11
Serial ATA connector: SATA1 .................................................................12
HDMI port connector: HDMI1 ..............................................................12
IDE pin header: IDE1..................................................................................13
Ethernet LAN pin header: CN3.............................................................14
VGA and USB pin header: VGA_USB1 ............................................15
Front Audio pin header: CN1................................................................16
USB pin header: CN2 .................................................................................17
Front Panel and PS/2 KBMS pin header: CN4...............................18
LPC, SMBus and Digital I/O pin header: CN5................................19
UART/VCP port 2: J1 ..................................................................................20
Bottom Side Connector..................................................................................21
UART/VCP port 1: J2 ..................................................................................21
LVDS Panel connector: LVDS1..............................................................22
External Battery: BAT1................................................................................23
Memory Module Installation...................................................................24

VI
Pin Header and Connector Vendor Lists...............................................26
3 Onboard Jumpers ............................................................................................27
Clear CMOS jumper: JM1.........................................................................28
LCD Panel Power Selector: JM2............................................................29
LCD Backlight Power Selector: JM3....................................................29
4 P720-A I/O Module Installation ................................................................31
P720-A Installation Procedure.....................................................................32
5 BIOS Setup............................................................................................................35
Entering the BIOS Setup Menu ..................................................................36
Control Keys .........................................................................................................36
Getting Help ........................................................................................................37
Main Menu ...........................................................................................................38
AMIBIOS............................................................................................................38
Processor ..........................................................................................................38
System Memory.............................................................................................38
System Time ....................................................................................................38
System Date ....................................................................................................38
Advanced Settings............................................................................................39
CPU Configuration ......................................................................................39
IDE Configuration ........................................................................................39
ACPI Configuration .....................................................................................39
APM Configuration .....................................................................................39
Spread Spectrum Configuration...........................................................39
USB Configuration.......................................................................................39
CPU Configuration ...........................................................................................40
CMPXCHG8B instruction support........................................................40
Nano CPU Thermal Monitor Adjust....................................................40
IDE Configuration .............................................................................................41
Parallel ATA IDE Controller......................................................................41
Hard Disk Write Protect ............................................................................41
IDE Detect Time Out (Sec).......................................................................41
ATA(PI) 80Pin Cable Detection .............................................................41
IDE Drives..............................................................................................................42
Primary IDE Master ......................................................................................42
Primary IDE Slave (SATA Device)..........................................................42
Type.....................................................................................................................42
LBA/Large Mode..........................................................................................42
Block (Multi-Sector Transfer)....................................................................43
PIO Mode.........................................................................................................43
DMA Mode .....................................................................................................43
S.M.A.R.T............................................................................................................43
32Bit Data Transfer......................................................................................43
ACPI Settings........................................................................................................44
General ACPI Configuration...................................................................44

VII
Advanced ACPI Configuration..............................................................44
Chipset ACPI Configuration ....................................................................44
General ACPI Configuration ........................................................................45
Suspend Mode ..............................................................................................45
Repost Video on S3 Resume ..................................................................45
Advanced ACPI Configuration ...................................................................46
ACPI Version Features ...............................................................................46
ACPI APIC Support.......................................................................................46
AMI OEMB Table..........................................................................................46
Headless Mode..............................................................................................46
Chipset ACPI Configuration .........................................................................47
USB Device Wakeup Function..............................................................47
APM Configuration...........................................................................................48
Power Management / APM ...................................................................48
Power Button Mode...................................................................................48
Suspend Power Saving Type..................................................................48
Restore on AC / Power Loss...................................................................48
Manual Throttle Ratio.................................................................................48
System Thermal .............................................................................................49
Standby Time Out........................................................................................49
Suspend Time Out.......................................................................................49
Hard Disk Time Out (Minute).................................................................49
Green PC Monitor Power State.............................................................49
Video Power Down Mode......................................................................49
Hard Disk Power Down Mode .............................................................49
Display Activity...............................................................................................49
Monitor IRQ3~15.........................................................................................49
Resume on Ring............................................................................................50
Resume on PME#.........................................................................................50
Resume On PS/2 KBC ................................................................................50
Wake-up Key ..................................................................................................50
Resume on PS/2 Mouse............................................................................50
Resume on RTC Alarm...............................................................................50
Spread Spectrum Configuration................................................................51
Spread Spectrum Configuration...........................................................51
USB Configuration ............................................................................................52
USB 1.1 Ports Configuration ...................................................................52
USB 2.0 Ports Enable ..................................................................................52
USB Device Mode Enable........................................................................52
Legacy USB Support...................................................................................52
USB 2.0 Controller Mode .........................................................................52
BIOS EHCI Hand-Off ...................................................................................52
Advanced PCI/PnP Settings..........................................................................53
Clear NVRAM .................................................................................................53

VIII
Plug & Play O/S.............................................................................................53
PCI Latency Timer.........................................................................................53
Allocate IRQ to PCI VGA...........................................................................53
Palette Snooping ..........................................................................................53
PCI IDE BusMaster........................................................................................54
Off Board PCI/ISA IDE Card ....................................................................54
IRQ3~15 ...........................................................................................................54
DMA Channel 0~7 .....................................................................................54
Reserved Memory Si e...............................................................................54
Boot Settings........................................................................................................55
Boot Settings Configuration....................................................................55
Boot Device Priority.....................................................................................55
Boot Settings Configuration.........................................................................56
Quick Boot.......................................................................................................56
Display Logo...................................................................................................56
AddOn ROM Display Mode....................................................................56
Bootup Num-Lock .......................................................................................56
PS/2 Mouse Support...................................................................................56
Wait For ‘F1’ If Error....................................................................................56
Hit ‘DEL’ Message Display........................................................................56
Interrupt 19 Capture...................................................................................57
Boot Device Priority ..........................................................................................58
1st Boot Device .............................................................................................58
Security Settings..................................................................................................59
Change Supervisor Password................................................................59
Change User Password ............................................................................59
Boot Sector Virus Protection...................................................................59
Advanced Chipset Settings...........................................................................60
North Bridge VIA VX855 Configuration...........................................60
South Bridge VIA VX855 Configuration...........................................60
North Bridge VIA VX855 Configuration................................................61
Software Reset E2 Issue.............................................................................61
Change DCLK using RDCKM .................................................................61
Dynamic CKE..................................................................................................61
NB Performance Register .........................................................................61
NB Energy Saving Register......................................................................61
OnChip VGA Configuration........................................................................62
VGA Frame Buffer Si e..............................................................................62
CPU Direct Access Frame Buffer ..........................................................62
Select Display Device..................................................................................62
Panel Type .......................................................................................................62
Dithering ..........................................................................................................62
Backlight Control ..........................................................................................62
South Bridge VIA VX855 Configuration................................................63

IX
Parallel Channel Enable ............................................................................63
ISA Master Support......................................................................................63
High Definition Audio................................................................................63
Enable Embedded COM..........................................................................63
PCI Debug Master Mode..........................................................................63
SMBus Multi-Master.....................................................................................63
PCI VCC33 Leakage Patch.......................................................................63
PCI Delay Transaction ................................................................................64
WATCH-DOG ................................................................................................64
Exit Options ..........................................................................................................65
Save Changes and Exit..............................................................................65
Discard Changes and Exit........................................................................65
Discard Changes ..........................................................................................65
Load Optimal Defaults...............................................................................65
6 Driver Installation...............................................................................................67
Driver Utilities.......................................................................................................68
Getting Started ..............................................................................................68
Running the Driver Utilities CD .............................................................68
CD Content ..........................................................................................................69

X

1
1
Product Ov rvi w

2
The VIA EPIA-P820 is an ultra-compact and highly integrated Pico-
ITX mainboard and the smallest stand-alone form-factor available
today. Through a high level of integration, the Pico-ITX form factor
is 75% smaller than the existing Mini-ITX form factor. The
mainboard enables the creation of an exciting new generation of
small, ergonomic, innovative and affordable embedded systems.
The VIA EPIA-P820 Pico-ITX mainboard is rich in I/O integration
and comes with an integrated VIA Nano 1.2 GH NanoBGA2
processor, boasting of ultra-low power consumption and cool
operation.
KEY COMPONENTS
VIA Nano 1.2 GHz NanoBGA2 Proc ssor
The VIA Nano is a 64-bit superscalar processor in x86 platform
using a 65 nanometer process technology. It delivers an energy-
efficient, powerful performance, with cool and quiet operation all
within an ultra compact NanoBGA2 package measuring 21mm x
21mm. Perfectly fit for embedded system applications such as
industrial PCs, test machines, measuring equipment, digital
signage, medical PCs, monitoring systems, gaming machines, in-
vehicle entertainment, and etc. The VIA Nano also boasts of
immersive multimedia performance, connectivity and computing
applications. When combined with the most recent VIA VX855
Media System Processor (MSP), which have been designed as
companion sets for the latest VIA processors, system developers
can utili e an impressive range of features for a wide range of
desktop and embedded applications.
VIA VX855 M dia Syst m Proc ssor
The VIA VX855 MSP integrates a premium graphics engine, an
HD audio controller, a DDR2 memory controller, an 800MH FSB
processor interface, and extensive I/O capabilities support in a
single chip design. Complementing the power-efficient VIA Nano
1.2 GH NanoBGA2 processor, the VX855 is based on a highly
sophisticated power efficient architecture that enables such rich
integration into a compact package with a maximum power
envelope of just 2.3 W.

3
MAINBOARD SPECIFICATIONS
CPU
VIA Nano 1.2 GH NanoBGA2 processor
• 800 MH Front Side Bus
Chipset
VIA VX855 All-in-One System Processor
Graphics
Integrated VIA Chrome9
TM
HCM DX9 with MPEG-2/4
Accelerators
System Memory
One DDR2 800/667 SODIMM slot (up to 2 GB)
Onboard Storage
One SATA 3Gb/s connector
One UltraDMA 133/100/66/33 44-pin IDE connector
A dio
VIA VT1708S High Definition Audio Codec
LAN
One VIA VT6122 Gigabit Ethernet controller
Onboard I/O
Connectors
One Audio pin connector for Line-out, Line-in and Mic-in
One Single-channel LVDS connector (5V/3V)
One LPC pin connector
One SMBus pin connector
One DIO pin connector(4 GPI & 4 GPO)
Two UART port / VCP pin header
One SYS fan connector
One PS2 mouse/keyboard pin header
One USB pin header for 4 additional USB 2.0 ports
One LAN pin header
One Front panel pin header
One Backlight control pin header
One SATA power connector
One +12V DC-in power pin connector
I/O Ports
One HDMI port
One VGA port
One GigaLAN port
Two USB ports
System Monitoring
and Management
Wake-On-LAN and Keyboard Power-on
Watch Dog Timer
System power management, AC power failure
BIOS
AMI BIOS with 4Mbit SPI flash memory
Operating System
Windows XP/CE/XPe and Linux
Operating
Environment
Temperature: 0°C up to 60°C
Humidity: 0% ~ 95% (relative humidity; non-condensing)
Compliance
CE/FCC/BSMI/RoHS
Dimensions
135 mm(w) x 45 mm(H) x 131 mm (D)
Form Factor
Pico-ITX
10 cm x 7.2 cm

4
EPIA-P820 LAYOUT
Top Sid
Symbol
SymbolSymbol
Symbol Description
DescriptionDescription
Description Symbol
SymbolSymbol
Symbol Description
DescriptionDescription
Description
CN1 Front Audio pin header PWR1 DC-In power connector
CN2 USB and USB Device port
pin header
PWR2 SATA Power connector
CN3 LAN Ethernet pin header FAN1 System Fan connector
CN4 Front Panel and PS/2
KBMS pin header
VGA_USB1 VGA and USB pin header
CN5 LPC, SMBus and Digital
I/O pin header
IDE1 IDE pin header
JM1 Clear CMOS jumper HDMI1 HDMI port
JM2 Panel Power Selector SATA1 SATA port
JM3 Panel Backlight Power
Selector
J1 VCP/UART port 2
Note:
USB Device port is a reserved feature, contact sa es for specific
support.

5
Bottom Sid
Symb
SymbSymb
Symbol
olol
ol Description
DescriptionDescription
Description Symbol
SymbolSymbol
Symbol Description
DescriptionDescription
Description
BAT1 CMOS Battery connector SODIMM1 DDR2 SODIMM slot
LVDS1 1-CH LVDS Panel connector J2 VCP/UART port 1

6
P720-A I/O MODULE LAYOUT
The VIA EPIA-P820 Pico-ITX mainboard is bundled with an I/O
board (P720-A) to support connections to LAN, VGA and USB.
Front Vi w
Top Vi w
Bottom Vi w
Symbol
SymbolSymbol
Symbol Description
DescriptionDescription
Description
VGA1 VGA port
USB1 USB 2.0 port 1
USB2 USB 2.0 port 2
RJ1 RJ-45 LAN port
CON1 VGA & USB board-to-board connector
CON2 LAN board-to-board connector

7
DEVELOPMENT KIT ACCESSORIES
DC-In Cabl
The DC-In power cable provides a means to connect to the power
brick.
Pow r Brick
The power brick provides a regulated 12V/5A output to power up
the EPIA-P820 mainboard.
Note:
The Power brick is not inc uded in the package of EPIA-P820
and this item shou d be purchased separate y.

8

9
2
Onboard
Conn ctors, Slots
and Pin H ad rs
This chapter provides you with information about hardware
installation procedures. It is recommended to use a grounded
wrist strap before handling computer components. Electrostatic
discharge (ESD) can damage some components.

10
TOP SIDE CONNECTORS
VIA Nano 1.2 GHz proc ssor with H atsink
The VIA EPIA-P820 Pico-ITX mainboard is packaged with a
standard VIA Nano 1.2 GH NanoBGA2 processor.
Syst m Fan conn ctor: FAN1
FAN1 runs on +5V and maintains system cooling. When
connecting the cable to the connector, always be aware that the
red wire (positive wire) should be connected to the +5V pin. The
black wire is the ground wire and should always be connected to
GND.
Pin Signal
1 +5V
2 GND