EMB-3550

USER' Manual V1.0

SZ HQ: 0775-27331166

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Shenyang: 024-23960846

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Tianjin: 022-23727100

Singapore: 65-68530809

Netherlands: 31-041-2668554

For more information, please visit: www. norco-group.com

EMB-3550

USER' Manual V1.0

Disclaimer

Expect for the accessories attached to the product as specified herein, what is contained

in this user manual does not represent the commitments of NORCO company. NORCO

company reserves the right to revise this User Manual, without prior notice, and will not

be held liable any direct, indirect, intended or unintended losses and/or hidden dangers

due to installation or improper operation.

Before ordering products, please learn about the product performance from the

distributors to see if it is in line with your needs. NORCO is a registered trademark of

Shenzhen Norco Intelligent Technology CO., LTD. The ownership of other trademarks

involved in this manual is owned by its respective owners.

The contents of this manual are protected by copyright law. All rights are strictly

reserved. Any form of unauthorized reproduction including but not limited to carbon

copy, facsimile transmission and electronic copy or email is prohibited.

Safety Instruction

1. Please read the product manual carefully before using this product.

2. Put all the unused or uninstalled boards or electronic components in a static

dissipative surface or static shielding bag.

3. Always ground yourself to remove any static discharge before touching the board,

to place your hands on grounding metal object for a while or wear a grounding

wrist strap at all times.

4. When taking or fetching the boards or cards, please wear antistatic gloves and

have the habit of holding the boards by its edges.

5. Make sure that your power supply is set to the correct voltage in your area,

Incorrect voltage may cause personal injuries and damage the system.

6. To prevent electronic shock hazard or any damage to the product, please ensure

that all power cables for the devices are unplugged when adding or removing any

devices or reconfiguring the system.

7. To prevent electrical shock hazard, disconnect the power cable the electrical

outlet before relocating the system.

8. When adding or removing devices to or from the system, ensure that all the power

cables for the devices are unplugged in advance.

9. To prevent unnecessary damage to the products due to the frequent power on/off,

please wait at least 30 seconds to restart the unit after the shutdown.

10. If system goes wrong during the operation, do not try to fix it by yourself. Contact

a qualified service technician or your retailer.

11. This product is classified ad Class A product, which may cause radio interference

in our living environment. In this occasion, users need to take measures to handle

the interference.

Content

Chapter 1 Product Introduction ........................................................................................................ 9

1.1 Hardware Specification ....................................................................................................... 9

Chapter 2 Hardware Function ........................................................................................................ 12

2.1 Interfaces Location and Dimension ............................................................................. 12

2.2 Installation Steps ................................................................................................................. 12

2.3 Jumper Settings .................................................................................................................... 13

2.3.1 COM2 Jumper Setting（J3,J4） ........................................................................ 14

（J3, J4 ）jumpers are used to configure COM1 transmission mode. COM1

supports RS232/RS485. Default setting RS232. ....................................................... 14

2.3.1 ........................................................................................................................................ 14

2.4 Interface Descriptions ....................................................................................................... 14

2.4.1 Serial Ports (COM1_COM4, COM_DB).......................................................... 14

2.4.2 USB Interface（USB12、USB34、USB56） ................................................ 16

2.4.3 Ethernet（LAN） ................................................................................................... 17

2.4.5 Display Interface（VGA, LVDS, HDMI） ....................................................... 18

2.4.6LVDS Jumper（J2） ............................................................................................... 20

2.4.7 Backlight Power and Control Interface（JLVDS） ................................... 21

2.4.8 Power Interface（PWR、PWR1、PWR2） ................................................ 22

2.4.13 MINI PCIe ................................................................................................................ 29

Chapter 3 Software Features ........................................................................................................... 31

3.1 Android ................................................................................................................................... 31

3.1.1VGA ............................................................................................................................... 31

3.1.2 HDMI ........................................................................................................................... 31

3.1.3 LCD .............................................................................................................................. 31

3.1.4 USB .............................................................................................................................. 31

3.1.5 COM ............................................................................................................................. 31

3.1.6 CAN .............................................................................................................................. 32

3.1.7 TF Card ....................................................................................................................... 32

3.1.8 WIFI ............................................................................................................................. 32

3.1.9 3G ................................................................................................................................. 32

3.1.10Ethernet ................................................................................................................... 32

3.1.11 Audio Card ............................................................................................................. 32

Support, Android OS realizes switch to local audio card output. .................................. 32

3.2 Linux......................................................................................................................................... 33

3.2.1VGA ............................................................................................................................... 33

3.2.2 HDMI ........................................................................................................................... 33

3.2.3 LCD .............................................................................................................................. 33

3.2.4 USB .............................................................................................................................. 33

3.2.5 COM ............................................................................................................................. 33

3.2.6 CAN .............................................................................................................................. 34

3.2.7 TF Card ....................................................................................................................... 34

3.2.8WIFI .............................................................................................................................. 34

AP:iwlist wlan0 scan ......................................................................................................... 34

3.2.93G .................................................................................................................................. 34

3.2.10Ethernet ................................................................................................................... 34

3.2.11Audio Card............................................................................................................... 35

Appendix ................................................................................................................................................. 37

Appendix 1: Glossary ................................................................................................................ 37

Packing List

Thanks for purchasing NORCO products. Please check the accessories as per the

packing list when you open its package. If you find any defect components or

anything damaged or lost, please contact your vendor ASAP.

EMB-3550 V1.0 Motherboard 1 pcs

Jumper Cap 1 packet

COM Adapter Cable 1 pcs

Chapter One

Product

Introduction

EMB-3550 V1.0

Chapter 1 Product Introduction

1.1 Hardware Specification

Size

Size:120mmx120

Processor:

CPU: RK3288(Coretex-A17)

RAM:

Onboard Memory：2GB default, supports DDRIII

Onboard Storage: 8GB default, EMMC flash

Display:

Display Interface: VGA, LVDS, HDMI

VGA: 1VGA, with definition up to 4Kx2K@60 Hz

LVDS: 1 dual channel LVDS interface, support 30Bit

HDMI: Support HDMI2.0, with definition up to 4Kx2K@60 Hz

Ethernet:

Network Controller: RJ(10/100/1000Mbps)

Audio:

Adopts ES8316 audio controlling chip

Provides 2xMIC-in pin, 1x Line-out pin

Support 5W power amplifier

I/O

Serial Ports: 5 serial ports, COM_DB, COM2-COM4 supports RS232, COM1

supports RS232/RS485

USB: 6 USB interface, 2x USB2.0, 4xUSB2.0mm pin, 1xUSB WIFI

SPI: 1xSPI

EMB-3550 V1.0

MIPI: 1xMIPI DSI

Touch: I2C to 4 wire resistive touch

Expansions:

1x MINI PCIe，supports WIFI, 3G module

Onboard SIM slot, co-working with Mini PCIe 3G module, to support 3G

network

Support multi bits GPIO

Power Support:

12V single power supply

Watchdog:

Support hardware reset

Operating environment:

Operating Temperature: 0℃～60℃

Humidity: 5%～95%, no condensing

第一章

产

品

介

绍

Chapter Two

Hardware

Function

EMB-3550 V1.0

Chapter 2 Hardware Function

2.1 Interfaces Location and Dimension

Following picture illustrate the front interfaces location and dimension of board EMB-

3550. Please pay attention to the installation steps. Improper installation of some

components may lead to system failure.

Note: When installing the board, please wear anti-static gloves in case of any

electrostatic damage caused during the installation.

2.2 Installation Steps

Please follow the steps below to assemble your computer.

1. Adjust all the jumper caps onboard EMB-3550 V1.0 according to the user manual.

2. Install other expansion cards.

3. Connect all signal lines, cables, panel control circuits and power supplier.

EMB-3550 V1.0

Key components of this motherboard are integrated circuit and these

components could be easily damaged by electrostatic influence. So, before

installing this unit, please always keep the following precautions in mind.

1. Hold the board by edges and do not touch any components or plug and socket

pins.

2. Wear anti-static gloves/wrist strap while touching the integrated circuit

components, such as CPU, RAM, etc.

3. Put those unused or uninstalled components in static shielding bags or trays.

4. Please first check the power switch is off before connecting the power plug.

Before installing the computer accessories: Following the instructions below will help to prevent your computer from being damaged, and also ensuring your personal safety. 1．Please make sure your computer is disconnected from the power supply.

2．Please always wear anti-static wrist strap or gloves to operate the board in case that you may touch the integrated circuit components, such as RAM.

2.3 Jumper Settings

Please refer to following instructions to setup jumpers before installing your hardware devices. Remark: How to identify the PIN1 of all jumpers and interfaces: Please observe the word mark on the side of the plug socket, which will be a “1” or bold line or triangular symbol; And please look at the back of PCB, each with a square shape will be the PIN 1; and all the jumpers’ PIN1 have a white arrow on the side.

2.3.1 COM2 Jumper Setting（J3,J4）

（J3, J4 ）jumpers are used to configure COM1 transmission mode. COM1 supports

RS232/RS485. Default setting RS232.

J3、J4：

COM1 AS RS232 PORT

COM1 AS RS485 PORT J3 1-3,2-4 J3 3-5,4-6

J4 1-2 J4 3-4,5-6

2.3.1

2.4 Interface Descriptions

Please read the manual carefully to connect external connector so as to avoid any damage to the board!

2.4.1 Serial Ports (COM1_COM4, COM_DB)

Provide 5 serial ports, COM1 supports RS232/RS485, COM_DB, COM2-COM4

supports RS232, COM1

EMB-3550 V1.0

COM1-COM4/COM_DB：

Signal Name PIN Signal Name NC 1 2 NC

COM_RX 3 4 COM_RT COM_TX 5 6 COM_CTS

NC 7 8 NC

GND 9 10 GND

When COM1are used to configureRS232 /RS485，the definition of pin in

motherboard：

PIN RS232（default） RS485

1 NC COM_ DATA

-

2 NC NC

3 COM_RXD COM_DATA+

4 COM_RTS# COM_RTS

5 COM_TXD COM_TX

6 COM_CTS# COM_CTS

7 NC NC

8 NC NC

COM1-COM4、COM_DB

EMB-3550 V1.0

9 GND GND

10 GND GND

2.4.2 USB Interface（USB12、USB34、USB56） Provide 5xUSB interface, 2x USB2.0 interface, 3xUSB2.0mm pin.

USB12：

PIN Signal Name 1、2 +5V 3、4 USB DATA- 5、6 USB DATA+ 7、8 GND

USB34、USB56：

Signal Name PIN Signal Name

VCC 1 2 GND USB DATA- 3 4 GND USB DATA+ 5 6 USB DATA+

GND 7 8 USB DATA- GND 9 10 VCC

USB12

USB34、USB56

EMB-3550 V1.0

2.4.3 Ethernet（LAN） Board provides 1x RJ45 LAN ports. The Yellow LED indicates data transfer status; the Green LED indicates network connectivity status.

RJ45 LAN LED：

LILED（green） F ACTLED（Yellow） Function On 100/1000M link Flash Data Transfer Off 10MLink/Close On No Data

LAN

EMB-3550 V1.0

2.4.4 Audio Interface (Audio) EMB-3550 V1.0 adopts ES8316 audio controlling chip

AUDIO：

Signal Name Pin 管脚

Signal Name MIC_IN2R 1 2 MIC_IN2L MIC_IN1R 3 4 MIC_IN1L

GND 5 6 GND GND 7 8 HeadPh_R NC 9 10 HeadPh_L

2.4.5 Display Interface（VGA, LVDS, HDMI） Board provides 1x VGA, 1x dual channel LVDS and 1x HD HDMI.

AUDIO

VGA:

Pin Signal Name PIN Signal Name称

PIN Signal Name 1 RED 6 GND 11 NC 2 GREEN 7 GND 12 SDA 3 BLUE 8 GND 13 HSYNC 4 NC 9 +5V 14 VSYNC 5 GND 10 GND 15 SCL

HDMI：

Signal Name PIN Signal Name D2+ 1 2 D2 Shield

D2- 3 4 D1+

D1 Shield 5 6 D1-

D0+ 7 8 D0 Shield D0- 9 10 CK+

CK Shield 11 12 CK- CE Remote 13 14 NC DDC CLK 15 16 DDC DATA

GND 17 18 +5V HP DET 19 20 SHELL0 SHELL1 21 22 SHELL2 SHELL3 23 24 SHELL4 SHELL5 25 26 SHELL6 SHELL7 27 28 SHELL8 SHELL9 29 30 SHELL10

SHELL11 31 LVDS：

Signal Name PIN 管脚

Signal Name

HDMI

LVDS

VGA

LVDS_VDD 1 2 LVDS_VDD LVDS_VDD 3 4 NC

GND 5 6 GND LVDS_D0N 7 8 LVDS_D0P LVDS_D1N 9 10 LVDS_D1P LVDS_D2N 11 12 LVDS_D2P

GND 13 14 GND LVDS_CLK0N 15 16 LVDS0_CLK0P

LVDS_D3N 17 18 LVDS_D3P LVDS_D5N 19 20 LVDS_D5P LVDS_D6N 21 22 LVDS_D6P LVDS_D7N 23 24 LVDS_D7P

GND 25 26 GND LVDS_CLK1N 27 28 LVDS0_CLK1P

LVDS_D8N 29 30 LVDS_D8P LVDS_D4N 31 32 LVDS_D4P LVDS_D9N 33 34 LVDS_D9P

2.4.6LVDS Jumper（J2）

J2： LVDS’s 1-3 output voltage

Signal Name Pin Signal Name VCC3 1 2 VCC3

LVDS_VDD 3 4 LVDS_VDD VCC5 5 6 VCC5

J2

EMB-3550 V1.0

2.4.7 Backlight Power and Control Interface（JLVDS）

JLVDS：

PIN Signal Name 1 +12V 2 +12V 3 PWM 4 BLK 5 GND 6 GND

JLVDS

EMB-3550 V1.0

2.4.8 Power Interface（PWR、PWR1、PWR2）

PWR:

PIN Signal Name 1 +12V 2 GND

PWR1/2:

PIN Signal Name 1 +12V 2 GND 3 NC

PWR

EMB-3550 V1.0

2.4.9 Interface (J1, J5)

J5：

Signal Name PIN Signal Name MIPI_TX_D2P 1 2 MIPI_TX_D2N MIPI_TX_D1P 3 4 MIPI_TX_D1N

GND 5 6 GND MIPI_TX_CLK

P 7 8

MIPI_TX_CLKN

MIPI_TX_D0P 9 10 MIPI_TX_D0N MIPI_TX_D3P 11 12 MIPI_TX_D3N

GND 13 14 GND MIPI_RX_D2P 15 16 MIPI_RX_D2N MIPI_RX_D1P 17 18 MIPI_RX_D1N

GND 19 20 GDN MIPI_RX_CLK

P 21 22

MIPI_RX_CLKN

MIPI_RX_D0P 23 24 MIPI_RX_D0N MIPI_RX_D3P 25 26 MIPI_RX_D3N

GND 27 28 GND

J5

J1

EMB-3550 V1.0

MIPI_TX/RX_D2P

29 30 MIPI_TX/RX_

D2N MIPI_TX/RX_

D1P 31 32

MIPI_TX/RX_D1N

GND 33 34 GND MIPI_TX/RX_

CLKP 35 26

MIPI_TX/RX_CLKN

MIPI_TX/RX_D0P

37 28 MIPI_TX/RX_

D0N MIPI_TX/RX_

D3P 39 40

MIPI_TX/RX_D3N

GND 41 42 GND VCC18_LCD 43 44 LCD_DCEN

VCC5 45 46 LCD_BLEN VCC5 47 48 LCD_PWM VCC3 49 50 LCD_RST

J1：

Signal Name Pin Signal Name CIF_D0 1 2 VCC_IO CIF_D1 3 4 GDN CIF_D2 5 6 I2C3_SIA CIF_D3 7 8 I2C3_SCL CIF_D4 9 10 CIF_CLKOUT CIF_D5 11 12 CIF_CLKIN CIF_D6 13 14 CIF_VSYNC CIF_D7 15 16 CIF_HREF CIF_D8 17 18 CIF_D10 CIF_D9 19 20 CIF_D11

EMB-3550 V1.0

2.4.10 Interface (J6, J7, J8, J9, J10)

J6: SPI

Signal Name PIN 管脚

Signal Name SPI2_CLK 1 2 VCC3 SPI2_CS0 3 4 VCC5 SPI2_CS1 5 6 I2C1_SDA SPI2_RXD 7 8 I2C1_SCL SPI2_TXD 9 10 GND

J7:SDIO

Signal Name PIN Signal Name VCC3 1 2 GND

SDIO0_CLK 3 4 SDIO0_D0 SDIO0_CMD 5 6 SDIO0_ D1 GPIO4_D2 7 8 SDIO0_ D2 GPIO4_D3 9 10 SDIO0_ D3

J9

J8

J10

J6

J7

EMB-3550 V1.0

J8:AD Signal Name PIN

管脚 Signal Name

VCC3 1 2 GDN ADC_IN0 3 4 PWR_KEY ADC_IN2 5 6 GPIO4_D5 PS2_CLK 7 8 GPIO4_D6

PS2_DATA 9 10 GPIO4_D7 J9: Power amplifier output

Signal Name PIN 管脚

Signal Name VCCA_

33 1 2 OUTPL

GND 3 4 OUTNL SPDIF_OUT 5 6 OUTNR

NC 7 8 OUTPR J10:TOUCH

Signal Name PIN 管脚

Signal Name LCD_CL

K 1 2 TOUCHSCREEN_

Y- LCD_DEN 3 4 TOUCHSCREEN_X- LCD_VSYNC 5 6 TOUCHSCREEN_Y+ LCD_HSYNC 7 8 TOUCHSCREEN_X+

EMB-3550 V1.0

2.4.11 Interface(OTG, TF)

Board provides 1x OTG, 1xTF

2.4.12 Front Panel Connector (JFP)

JFP is used to connect all function buttons and indicator LED lamps on the chassis

front panel.

OTG

TF

JFP

EMB-3550 V1.0

JFP：

Signal Name PIN Signal Name PECOVER 1 2 GND

VCC_18 3 4 GND PMIC_PWRON 5 6 GND

RESET 7 8 GND JFP_PWRSW 9 10 GND

Please follow the table below to connect and pay attention to the anode(+)and

cathode(-), otherwise , some function cannot be realized.

POWER LED

HDD LED

RESET SW PWRSW

1）System Power LED Pins（Pin 1/2 for PWRLED）

Connect system power LED cable with these pins.（pin 1 is LED anode）When

system is power on, power LED is on；when system is power off, power LED is off.

2）HD LED Pins (Pin3/4 for HDD LED）

One HD LED on the case panel indicating HD status. When HD read and write, the

LED will flash, indicating the device is working. Connect the LED cable to the LED

pins ( Pin3 is LED anode).

3）Reset Button Pins (Pin7/8 for RESET ）

Connect the reset button cable to these two pins. When system fails, reset button

can make the system continue to work and no need to turn on / off the power.

4）Power Button Pins（Pin 9/10 for POWER BUTTON）

Connect these two pins to the bounce switch on the chassis to connect or disconnect

the power supply.

EMB-3550 V1.0

2.4.13 MINI PCIe Board provides one Mini PCIe slot. Users can expands their MINI PCIe devices according to the conditions. If you use the Mini PCIE WiFi, the wireless network that you choose will indicate the status of the WLAN card.

第一章

产

品

介

绍

Chapter

Three

Software

Function

EMB-3550 V1.0

Chapter 3 Software Features

3.1 Android

3.1.1VGA Support VGA output

Instruction: VGA+ HDMI default dual-screen display, use VGA to connect

motherboard and display, you can see the Android interface after the power is on.

3.1.2 HDMI Support HDMI output

Instruction: VGA+ HDMI default dual-screen display. You can use VGA to connect

motherboard and display, and you can see the Android interface after the power is

on.

3.1.3 LCD Support LVDS LCD output; Driver is customized as per customers’ LCD screen

3.1.4 USB U-Disk auto mount directory:/mnt/usb_storage/

Instruction: connects U-Disk to USB interface, open file browser, you can look up

files on /mnt/udisk of U-Disk

3.1.5 COM Serial port operation node: ttyS0 ttyS1 ttyS3 ttyS4

Instruction: serial port2~5 connects to serial portsbusyboxcp -rfcom_arm/ /data/

cd /data/com_arm/

type in ./c_android.sh

After typingin baud rate and test timeaccording instruction, test result

will come outautomatically after the operation.

EMB-3550 V1.0

3.1.6 CAN Do not support CANBUS interface

3.1.7 TF Card TF Card auto mount directory: /dev/extsd/

Instruction: You can connect TF card to TF motherboard, open file browser and

enter/mnt/extsd to look up files.

3.1.8 WIFI Support, how to operate, please refer to android interface

Instruction: Open device-> wireless and network ->WIFI, on the right of the

interface, you can see the wireless router SSID, choose one to connect. If the router

has set the password, please type in the password.

3.1.9 3G Customize driver as per the 3G module that customers utilize.

3.1.10Ethernet Support, how to operate, please refer to android interface

Instruction: Open device-> wireless and network ->Ethernetconfiguration, check

Ethernet, then click Ethernet configuration-> Ethernet Devices, first network

adapter choose eth0, second adapter choose eth1 -> Connection type choose HDCP

or Static IP according to your actual needs.

3.1.11 Audio Card

Support, Android OS realizes switch to local audio card output.

Instruction: when HDMI plays audio or video file, please use earphone or stereo

equipment to test sound output.

Sound adapter：alsa_aplay xx.wav

EMB-3550 V1.0

3.2 Linux

3.2.1VGA Support Instruction:VGA+ HDMI default dual-screen display, use VGA to connect motherboard

and display, you can see the Linux interface after the power is on.

3.2.2 HDMI Support HDMI

Instruction:VGA+ HDMI default dual-screen display, use HDMI to connect

motherboard and display, you can see the Linux interface after the power is on.

3.2.3 LCD Support LVDS LCD output; Driver is customized as per customers’ LCD screen

3.2.4 USB Support Instruction: connects U-Disk to USB interface, and you can look up U-Disk.

Mount U-Disk to system: mount /dev/sdX1 /mnt (sdX1 represents U-Disk)

EnterU-Disk to be able operate：cd /mnt

3.2.5 COM Device node: /dev/ttymxc0~/dev/ttymxc4

Instruction: serial port2~5 connects to serial portsbusyboxcp -rfcom_arm/ /data/

cd /data/com_arm/

type in ./c_android.sh

EMB-3550 V1.0

After typing in baud rate and test time according instruction, test result will come

out automatically after the operation.

3.2.6 CAN Do not support.

3.2.7 TF Card Support, need to mount for testing

Instruction: You can connect TF card to USB interface and look up U-Disk: fdisk –l.

Mount TF card to the system: mount /dev/mmcblk1p1 /mnt

Enter TF card catalogue to be able to operate: cd /mnt

3.2.8WIFI Support, need iwlistiwconfig testing

Instruction:

AP:iwlist wlan0 scan

Connect to AP:iwconfig wlan0 essidxxxx

Set up wlan0 IP:iwconfig wlan0 xx.xx.xx.xx

Ping route：pingxx.xx.xx.xx

3.2.93G Customize driver as per the 3G module that customers utilize.

3.2.10Ethernet Support, need tool “ifconfigdhcp ping” for testing Instruction: Check network adapter device：ifconfig -a Static IP: ifconfigethX X.X.X.X or dynamic IP: dhclientethX Ping route：ping xx.xx.xx.xx

EMB-3550 V1.0

3.2.11Audio Card Support, needtoolalsa-untis for testing Instruction:

Check sound adapter device：aplay -l

Operate alsamixer，then get HeardPhone and PCM to the max volume，play audio

file:aplay XX.wav

HDMI output audio:aplay -D hw:2,0 XX.wav

Appendix

Appendix

Appendix 1: Glossary

ACPI Advanced Configuration and Power Management. ACPI specifications allow most OS control computer including Windows98/98se, Windows 2000 and Windows ME and most power of the computer.

BIOS Basic input/output system. It is a kind of software including all in/out control code interface in PC. It will do hardware testing while system is booting, and then the O/S runs. BIOS provides a interface between O/S and hardware and is stored in a ROM chip.

BUS In a computer system, it is the channel among different parts for exchanging data; it is also a set of hardware lines. BUS here refers to part lines inside CPU and the main components of system memory.

Chipset Chipset is anIntegrated set of chips for executing one or more related functions。Here it refers to a system level chipset structured by Southbridge & Northbridge; It decides the structure and main functions of motherboard.

CMOS Complementary Metal-Oxide Semiconductor, which is a widely used semiconductor with the characteristics of high-speed and low-power. COMS here refers to part of space on-board CMOS RAM for saving date, time, system information and system parameter, ect.

COM Computer-Output Microfilmer. A universal serial communication interface, usually adopts normative DB 9 connector.

DIMM Dual-Inline-Memory-Modules. It is a small circuit board with memory chipset providing 64 bit memory bus width.

DRAM Dynamic Random Access Memorizer. It is a normal type of memory often with a transistor and a capacitance to store 1 bit. With the development of the technology,

more and more types of DRAM with different specifications exist in computer applications. For example: SDRAM/DDR SDRAM/RDRAM.

LAN Network interface. Network grouped by correlative computers in a small area, generally in a company or a building. Local area network is buildup by sever, workstation, some communications links. Terminals can access data and devices anywhere through cables, which enables users to share costly devices and resource.

LED Light-Emitting Diode.A semiconductor device that shines when power supply is connected, It is often used to denote information directly, for example, to denote power on or HDD working normally.

PnP Plug-and-Play. It is a specification that allows PC to configure its external devices automatically and can work independently without the manual operation by its user . To achieve this function, its BIOS should be able to support PnP and a PnP expansion card

POST Self-test when power on. While the system is booting, BIOS will do an uninterrupted testing to the system, including RAM, keyboard, hard disk drive etc. to check if all the components are in normal situation and work well.

PS/2 A keyboard & mouse connective interface specification developed by IBM.PS/2 is a DINinterface with only 6PIN; it also can connect other devices, like modem

USB It is the Universal Serial Bus for short. A hardware interface adapts to low speed peripherals, and is always used to connect keyboard, mouse etc. One PC can connect maximum 127 USB devices, providing 12Mbit/s transmit bandwidth USB supports hot swap and multi- data stream, namely, you can plug USB devices while system is running, system can auto-detect and makes it work on.