user manual EPIA-P820 Pico-ITX Mainboard Revision 1.
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Regulatory Compliance FCC-A Radio Frequency Interference Statement This equipment has been 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 reasonable protection against harmful interference when the equipment is operated in a commercial environment.
Safety Precautions Do’s o Always read the safety instructions carefully. o Keep this User's Manual for future reference. o All cautions and warnings on the equipment should be noted. o Keep this equipment away from humidity. o Lay this equipment on a reliable flat surface before setting it up. o Make sure the voltage of the power source and adjust properly 110/220V before connecting the equipment to the power inlet. o Place the power cord in such a way that people cannot step on it.
Box Contents 1 1 1 1 1 x x x x x EPIA-P820 Pico-ITX mainboard P820-A I/O module board SATA cable SATA power cable DC-In cable V
TABLE OF CONTENTS 1 Product Overview............................................................................................... 1 Key Components ................................................................................................. 2 VIA Nano 1.2 GHz NanoBGA2 Processor ........................................ 2 VIA VX855 Media System Processor..................................................... 2 Mainboard Specifications .......................................................................
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 ....................................................
Advanced ACPI Configuration..............................................................44 Chipset ACPI Configuration ....................................................................44 General ACPI Configuration ........................................................................45 Suspend Mode ..............................................................................................45 Repost Video on S3 Resume ..................................................................
Plug & Play O/S .............................................................................................53 PCI Latency Timer.........................................................................................53 Allocate IRQ to PCI VGA...........................................................................53 Palette Snooping ..........................................................................................53 PCI IDE BusMaster...............................................................
Parallel Channel Enable ............................................................................63 ISA Master Support......................................................................................63 High Definition Audio................................................................................63 Enable Embedded COM..........................................................................63 PCI Debug Master Mode..........................................................................
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1 Product Overview 1
The VIA EPIA-P820 is an ultra-compact and highly integrated PicoITX 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.
MAINBOARD SPECIFICATIONS CPU VIA Nano 1.
EPIA-P820 LAYOUT Top Side Symbol CN1 CN2 CN3 CN4 CN5 JM1 JM2 JM3 Description Front Audio pin header USB and USB Device port pin header LAN Ethernet pin header Front Panel and PS/2 KBMS pin header LPC, SMBus and Digital I/O pin header Clear CMOS jumper Panel Power Selector Panel Backlight Power Selector Symbol PWR1 PWR2 FAN1 VGA_USB1 IDE1 HDMI1 SATA1 J1 Description DC-In power connector SATA Power connector System Fan connector VGA and USB pin header IDE pin header ® HDMI port SATA port UART port 2 Not
Bottom Side Symbol BAT1 LVDS1 Description Symbol Description CMOS Battery connector 1-CH LVDS Panel connector SODIMM1 J2 DDR2 SODIMM slot UART port 1 5
P820-A I/O MODULE LAYOUT The VIA EPIA-P820 Pico-ITX mainboard is bundled with an I/O board (P820-A) to support connections to LAN, VGA and USB. Front View Top View Bottom View Symbol VGA1 USB1 USB2 RJ1 CON1 CON2 Description VGA port USB 2.0 port 1 USB 2.
DEVELOPMENT KIT ACCESSORIES DC-In Cable The DC-In power cable provides a means to connect to the power brick. Power Brick The power brick provides a regulated 12V/5A output to power up the EPIA-P820 mainboard. Note: The Power brick is not included in the package of EPIA-P820 and this item should be purchased separately.
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2 Onboard Connectors, Slots and Pin Headers 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.
TOP SIDE CONNECTORS VIA Nano 1.2 GHz processor with Heatsink The VIA EPIA-P820 Pico-ITX mainboard is packaged with a standard VIA Nano 1.2 GHz NanoBGA2 processor. System Fan connector: 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.
DC-In Power connector: PWR1 EPIA-P820 has an onboard DC-In 2-pin power connector to connect the DC-In power cable. Pin Signal 1 2 DC In (+12V) GND Serial ATA Power connector: PWR2 The mainboard supports a 3-pin SATA power connector for SATA power cable. Plug the SATA power cable into the SATA power connector. Make sure the power plug is inserted in the proper orientation and pins are aligned.
Serial ATA connector: SATA1 The current SATA interface allows a data transfer rate of up to 300 MB/s — approximately 225% faster than Ultra DMA parallel ATA. HDMI® port connector: HDMI1 The mainboard has a High Definition Multimedia Interface port for ® connecting to high definition video and digital audio. The HDMI port allows you to connect digital video devices which utilize a ® high definition video signal. The HDMI port is HDCP 1.2 compatible. Note: CEC feature is not supported.
IDE pin header: IDE1 The mainboard has an Ultra DMA 133/100 controller. You can connect up to two IDE devices in any combination.
Ethernet LAN pin header: CN3 The Ethernet LAN pin header is for connecting to the P820-A I/O module. Pin Signal Pin Signal 1 3 5 7 9 11 13 A3V3GL(+3.3V) TXNC TXPC TXNA TXPA GND LED2 2 4 6 8 10 12 14 +3.
VGA and USB pin header: VGA_USB1 The VGA and USB pin header is for connecting to the P820-A I/O module.
Front Audio pin header: CN1 This pin header allows you to connect a front audio to the mainboard.
USB pin header: CN2 This 20-pin USB pin header allows you to connect up to four USB2.0 ports.
Front Panel and PS/2 KBMS pin header: CN4 This single pin header allows you to connect the power switch, reset switch, power LED, HDD LED, case speaker and two PS/2 ports. Pin Signal Pin Signal 1 3 5 7 9 11 13 15 17 +PWR_LED +5VSUS (for LED use) GND SPEAK_BZ GND -PWR_LED +5VSUS KB_CLK MS_CLK 2 4 6 8 10 12 14 16 18 +HD_LED -HD_LED PW_SW GND RST_SW GND GND KB_DT MS_DT Note: Pins 1 to 12 are for Front Panel and pin 13 to 18 use for PS/2 KBMS.
LPC, SMBus and Digital I/O pin header: CN5 This single pin header allows the connection of LPC, SMBus devices and the Digital Input and Output. Pin Signal Pin Signal 1 3 5 7 9 11 13 15 17 19 21 23 25 GND SIOOSC LPCCLK -LDRQ1 SERIRQ -SIOSMI/-PME SIOSMI SMB_CLK +5V GPO5/CSTATE1 GPO6/-C4PSTOP GPIO0/SMBDT2 GPIO1/SMBCK2 GND 2 4 6 8 10 12 14 16 18 20 22 24 26 LAD3 LAD2 LAD1 -LFRAME LAD0 -PCIRST1 SMB_DAT +3.
UART port 2: J1 UART offers TTL level serial signal for the user to easily convert to support RS232/RS422/RS485.
BOTTOM SIDE CONNECTOR UART port 1: J2 UART offers TTL level serial signal for the user to easily convert to support RS232/RS422/RS485. Pin UART Signal 1 2 3 4 5 6 7 8 9 10 11 12 GND -LPCRST CTS_0 RTS_0 DSR_0 DTR_0 SIN_0 SOUT_0 DCD_0 RI_0 +3.3V (Pin 12) Default: 3.
LVDS Panel connector: LVDS1 The single-channel LVDS connector allows you to connect the panel’s LVDS cable directly to support LVDS panel. Pin Signal Pin Signal 1 3 5 7 9 11 13 15 17 19 21 23 LVDSD0LVDSD0+ GND Panel_VDD Panel_VDD LCD1_DATA LCD1_CLK GND Back Light_VDD Back Light_VDD BL_ENABLE DIMMING 2 4 6 8 10 12 14 16 18 20 22 24 LVDSD1LVDSD1+ GND LVDSD2LVDSD2+ GND LVDSCLK+ LVDSCLKGND LVDSD3LVDSD3+ GND Note: Contact local distributor and FAE for special Video BIOS for 24bit LCD panel support.
External Battery: BAT1 The mainboard comes with external CMOS battery connector. This 2-pin connector used to connect the external cable battery for CMOS. Pin Signal 1 2 +3.
Memory Module Installation Memory Slot: SODIMM1 The VIA EPIA-P820 Pico-ITX mainboard has one 200-SODIMM slot for DDR2 667/533 SDRAM memory modules and supports memory sizes up to 2 GB. Available DDR2 SDRAM Configuration Refer to the table below for available DDR2 SDRAM configurations on the mainboard.
Installing the memory Step 1 Locate the SODIMM slot in the mainboard and align the notch on the SODIMM with the memory slot. Step 2 Insert the SODIMM module at a 45 degree angle. Then push the SODIMM down until it snaps into the locking mechanism.
PIN HEADER AND CONNECTOR VENDOR LISTS Items CN1 CN2 CN3 CN4 CN5 J1 J2 VGA_ USB1 LVDS1 PWR1 PWR2 FAN1 Function Pin Pitch Vendor P/N Front Audio USB Ethernet LAN Front Panel and PS/2 KBMS LPC, SMBus and Digital I/O UART UART 8 Pin 20 Pin 14 Pin 2.0mm 2.0mm 2.0mm Neltron Neltron Neltron 2208SM-08G-BK-CP 2208SM-20G-BK-CP 2208SM-14G-BK-CP 18 Pin 2.0mm Neltron 2208SM-18G-BK-CP 26 Pin 2.0mm Neltron 2208SM-26G-BK-CP 10 Pin 12 Pin 1.0mm 1.
3 Onboard Jumpers 27
Clear CMOS jumper: JM1 The onboard CMOS RAM stores system configuration data and has an onboard battery power supply. To reset the CMOS settings, set the jumper on pins 2 and 3 while the system is off. Return the jumper to pins 1 and 2 afterwards. Setting the jumper while the system is on will damage the mainboard. The default setting is on pins 1 and 2.
LCD Panel Power Selector: JM2 This jumper determines the input voltage for the LCD connector. Setting 1 2 3 +5V +3.3V (default) ON OFF ON ON OFF ON LCD Backlight Power Selector: JM3 This jumper determines the input voltage for the LCD backlight inverter.
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4 P820-A I/O Module Installation 31
P820-A INSTALLATION PROCEDURE Step 1 Align and mount the P820-A board. Step 2 Align the CON1 (VGA & USB board-to-board connector) and CON2 (LAN board-to-board connector) of P820-A I/O module board with the CN3 and VGA_USB1 pin headers to the top side of EPIA-P820 mainboard respectively.
Step 3 Then gently press down until the pins on the EPIA-P820 mainboard have been fully inserted into the CON1 and CON2 connectors of the P820-A I/O module board. Step 4 Secure the EPIA-P820-A I/O module with two screws.
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5 BIOS Setup This chapter gives a detailed explanation of the BIOS setup functions.
ENTERING THE BIOS SETUP MENU Power on the computer and press Delete during the beginning of the boot sequence to enter the BIOS setup menu. If you missed the BIOS setup entry point, restart the system and try again.
GETTING HELP The BIOS setup program provides a “General General Help” Help screen. You can display this screen from any menu/sub-menu by pressing . F1 The help screen displays the keys for using and navigating the BIOS setup. Press sc to exit the help screen.
MAIN MENU AMIBIOS BIOS version number and related information. Processor CPU information. System Memory Memory size. System Time Use the key “+” or “-” to configure system time. The time format is [Hour : Minute : Second]. System Date Use the key “+” or “-” to configure system Date. The date format is [Day, Month, Date, Year].
ADVANCED SETTINGS CPU Configuration IDE Configuration ACPI Configuration APM Configuration Spread Spectrum Configuration USB Configuration 39
CPU CONFIGURATION CMPXCHG8B instruction support Settings: [Enabled, Disabled] Nano CPU Thermal Monitor Adjust Settings: [Disabled, Thermal Monitor 1, Thermal Monitor 2, Thermal Monitor 3] 40
IDE CONFIGURATION Parallel ATA IDE Controller Settings: [Disabled, Primary] Hard Disk Write Protect Settings: [Disabled, Enabled] IDE Detect Time Out (Sec) Settings: [0, 5, 10, 15, 20, 25, 30, 35] ATA(PI) 80Pin Cable Detection Settings: [Host & Device, Host, Device] 41
IDE DRIVES Primary IDE Master Primary IDE Slave (SATA Device) Type Settings: [Not Installed, Auto, CD/DVD, ARMD] LBA/Large Mode Settings: [Disabled, Auto] 42
Block (Multi-Sector Transfer) Settings: [Disabled, Auto] PIO Mode Settings: [Auto, 0, 1, 2, 3, 4] DMA Mode Settings: [Auto] S.M.A.R.T. Self Monitoring Analysis and Reporting Technology, a monitoring system for hard disks.
ACPI SETTINGS General ACPI Configuration This menu contains ACPI (Advanced Configuration and Power Management Interface) options.
GENERAL ACPI CONFIGURATION Suspend Mode Select the ACPI state used for system suspend. Settings Description S1(POS) S1/Power On Suspend (POS) is a low power state. In this state, no system context (CPU or chipset) is lost and hardware maintains all system contexts S3/Suspend To RAM (STR) is a power-down state. In this state, power is supplied only to essential components such as main memory and wakeup-capable devices.
ADVANCED ACPI CONFIGURATION ACPI Version Features To enable RSDP pointers to 64-bit Fixed System Description Tables. Settings: [ACPI v1.0, ACPI v2.0, ACPI v3.0] ACPI APIC Support To include ACPI APIC table pointer to RSDT pointer list. Settings: [Enabled, Disabled] AMI OEMB Table To include OEMB table pointer to R(X)SDT pointer lists. Settings: [Disabled, Enabled] Headless Mode To enable or disable headless operation mode through ACPI.
CHIPSET ACPI CONFIGURATION USB Device Wakeup Function Settings: [Disabled, Enabled] 47
APM CONFIGURATION Power Management / APM Settings: [Disabled, Enabled] Power Button Mode Settings: [On/Off, Standby, Suspend] Suspend Power Saving Type Settings: [C3, S1] Restore on AC / Power Loss The field defines how the system will respond after an AC power loss during system operation. Settings Description Power Off Keeps the system in an off state until the power button is pressed.
System Thermal Settings: [Disabled, Enabled] Standby Time Out Settings: [Disabled, 1/2/4/8/10/20/30/40/50/60 minutes] Suspend Time Out Settings: [Disabled, 1/2/4/8/10/20/30/40/50/60 minutes] Hard Disk Time Out (Minute) Settings: [Disabled, 1/2/3/4/5/6/7/8/9/10/11/12/13/14/15 minutes] Green PC Monitor Power State Settings: [Standby, Suspend, Off] Video Power Down Mode Settings: [Disabled, Standby, Suspend] Hard Disk Power Down Mode Settings: [Disabled, Standby, Suspend] Display Activity Settings: [Ign
Resume on Ring Settings: [Disabled, Enabled] Resume on PME# Settings: [Disabled, Enabled] Resume On PS/2 KBC Settings: [Disabled, S3, S3/S4/S5] Wake-up Key Settings: [Any Key, Specific Key] Resume on PS/2 Mouse Enable any mouse activity to restore the system from the power saving mode to an active state. Settings: [Disabled, S3, S3/S4/S5] Resume on RTC Alarm Set a scheduled time and/or date to automatically power on the system.
SPREAD SPECTRUM CONFIGURATION Spread Spectrum Configuration Settings: [Disabled, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.
USB CONFIGURATION USB 1.1 Ports Configuration To enable USB 1.1 host controllers. Settings: [Disabled, USB 2 ports, USB 4 ports, USB 6 ports] USB 2.0 Ports Enable To enable USB 2.0 host controllers. Settings: [Disabled, Enabled] USB Device Mode Enable Settings: [Enabled, Disabled] Legacy USB Support To enable support for legacy USB. Settings: [Disabled, Enabled, Auto] USB 2.0 Controller Mode To configure the USB 2.0 controller in HiSpeed (480Mbps) or FullSpeed (12Mbps).
ADVANCED PCI/PNP SETTINGS Note: This section covers some very technical items and it is strongly recommended to leave the default settings as it is unless you are an experienced user. Clear NVRAM To clear NVRAM during system boot. Settings: [No, Yes] Plug & Play O/S Settings: [No, Yes] PCI Latency Timer Value in units of PCI clocks for PCI device latency timer register.
PCI IDE BusMaster Settings: [Disabled, Enabled] Off Board PCI/ISA IDE Card Settings: [Auto, PCI Slot1, PCI Slot2, PCI Slot3, PCI Slot4, PCI Slot5, PCI Slot6] IRQ3~15 Settings: [Available, Reserved] DMA Channel 0~7 Settings: [Available, Reserved] Reserved Memory Size To decide the size of memory block to reserve for legacy ISA devices.
BOOT SETTINGS Boot Settings Configuration Configuration settings during system boot. Boot Device Priority Specifies the boot device priority sequence.
BOOT SETTINGS CONFIGURATION Quick Boot Settings: [Disabled, Enabled] Display Logo Settings: [Disabled, Enabled] AddOn ROM Display Mode Settings: [Force BIOS, Keep Current] Bootup Num-Lock To select power-on state for Num-Lock.
Interrupt 19 Capture Settings: [Disabled, Enabled] 57
BOOT DEVICE PRIORITY 1st Boot Device To specifies the boot sequence from the available devices. The available boot devices are detected dynamically according to real situation and variable options will be provided.
SECURITY SETTINGS Change Supervisor Password This option is for setting a password for entering BIOS Setup. When a password has been set, a password prompt will be displayed whenever BIOS Setup is run. This prevents an unauthorized person from changing any part of your system configuration. When a supervisor password is used, the BIOS Setup program can be accessed and the BIOS settings can be changed.
ADVANCED CHIPSET SETTINGS Caution: The Advanced Chipset Features menu is used for optimizing the chipset functions. Do not change these settings unless you are familiar with the chipset.
NORTH BRIDGE VIA VX855 CONFIGURATION Software Reset E2 Issue Settings: [Patch, Escape Patch] Change DCLK using RDCKM Settings: [Program, Escape Program] Dynamic CKE Settings: [Disabled, Enabled] NB Performance Register Settings: [Disabled, Enabled] NB Energy Saving Register Settings: [Disabled, Enabled] 61
ONCHIP VGA CONFIGURATION VGA Frame Buffer Size Settings: [64MB, 128MB, 256MB] CPU Direct Access Frame Buffer Settings: [Disabled, Enabled] Select Display Device Settings: [CRT, LCD, HDMI, CRT+LCD, CRT+HDMI] Panel Type Settings: [02] Dithering Settings: [Disabled, Enabled] Backlight Control Settings: [0%, 25%, 50%, 75%, 100%] 62
SOUTH BRIDGE VIA VX855 CONFIGURATION Parallel Channel Enable Settings: [Enabled, Disabled] ISA Master Support Settings: [Support, Not Support] High Definition Audio Settings: [Disabled, Auto] Enable Embedded COM Settings: [Disabled, Enabled] PCI Debug Master Mode Settings: [Disabled, Enabled] SMBus Multi-Master Settings: [Disabled, Enabled] PCI VCC33 Leakage Patch Settings: [Disabled, Enabled] 63
PCI Delay Transaction Settings: [Disabled, Enabled] WATCH-DOG Settings: [Disabled, Enabled] 64
EXIT OPTIONS Save Changes and Exit Exit system setup after saving the changes, or press “F10”. Discard Changes and Exit Exit system setup without saving any changes, or press “Esc”. Discard Changes Discard changes which have been done so far to any of the setup questions, or press “F7”. Load Optimal Defaults Load optimal default values for all the setup items, or press “F9”. The default optimized values are set by the mainboard manufacturer to provide a stable system with optimized performance.
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6 Driver Installation .
MICROSOFT DRIVER SUPPORT The VIA EPIA-P820 mainboard is compatible with Microsoft operating systems. The latest Windows drivers can be downloaded from the VEPD website at www.viaembedded.com. For embedded operating systems, the related drivers can be found in the VIA Embedded website at www.viaembedded.com. LINUX DRIVER SUPPORT The VIA EPIA- P820 mainboard is highly compatible with many Linux distributions. Support and drivers are provided through various methods including: 1. Drivers provided by VIA 2.
