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1. Vi Embedded Controller AEC 6520 Contents Chapter 1 General Information niroguGtlgO ueu LL LL LL Nu 1 2 1 2 Features a Y NN 1 3 e tee E 1 4 Chapter 2 Hardware Installation AARTE RE 2 2 2 2 USB2 0 Port 1 Connector CN1 2 3 2 3 Serial Port COM2 Connector CN6 2 3 2 4 Ethernet 10 100Base TX RJ 45 Phone Jack Connector ENT enee EE Ee Ee EE 2 4 2 5 Serial Port COM1 Connector CN189 2 4 2 6 CRT Display Connector CN19 2 4 2 7 Installing Cables en 2 5 2 8 Wallmount Kit Installaton esses 2 14 Chapter 3 Award BIOS Setup 3 1 System Test and Initialization 3 2 3 2 Award BIOS Setup pp 3 3 Chapter 4 Driver Installation 4 1 Installation EE 4 3 Appendix A Programming The Watchdog Timer AT Programming essem A 2 vii Embedded Controller AEC 6520 A 2 ITE8712 Watchdog Timer Initial Program A 5 Appendix B I O Information B 1 I O Address Map see B 2 B 2 1 MB Memory Address Map ueu B 2 B 3 IRQ Mapping Chart esseesssessesrssresrrssrrsssrrssrnssns B 3 DA DMA Channel Assignments B 3 viii Embedded Controller AEC 6520 Chapter General Information Chapter 1 General Information 1 1 Embedded Controller AEC 6520 1 1 Introduction Due to the growing popularity from th
2. Driver folder and select the OS your system is 2 Double click on the Setup exe Follow the instructions that the window shows 4 The system will help you install the driver automatically Step 3 Install Intel LAN Driver 1 Click on the Step 3 ntel LAN Driver folder and select the OS your system is Double click on the exe file Follow the instructions that the window shows 4 The system will help you install the driver automatically Chapter 4 Drivers Installation 4 3 Embedded Controller AEC 6520 Step 4 Install Realtek AC97 codec Driver 1 Click on the Step 4 Realtek AC97 codec Driver folder and double click on the wdm_a361 exe file 2 Follow the instructions that the window shows 3 The system will help you install the driver automatically Chapter 4 Driver Installation 4 4 Embedded Controller AEC 6520 Appendix Programming the Watchdog Timer Appendix A Programming the Watchdog Timer A 1 Embedded Controller AEC 6520 A 1 Programming AEC 6520 utilizes ITE 8712 chipset as its watchdog timer controller Below are the procedures to complete its configuration and the AAEON intial watchdog timer program is also attached based on which you can develop customized program to fit your application Configuring Sequence Description After the hardware reset or power on reset the ITE 8712 enters the normal mode with all logical devices disabled except KBC The initial state enable bit of
3. AEC 6520 Chapter Hardware Installation Chapter 2 Hardware Installation 2 1 Embedded Controller AEC 6520 2 1 Dimension E J rrj Bs poca Da pobre lt rrj IO IO DCH UL CLl LI E f m COJfr o DE USE PONER o Jo I I I I D D D I D I D D D I er pe Chapter 2 Hardware Installation 2 2 Embedded Controller AEC 6520 2 2 USB2 0 Port 1 Connector CN1 Pin Signal Pin Signal 1 USBVDDO 1 2 USBGND 3 USBDO USBGND 5 USBDO 6 USBD1 7 USBGND 8 USBD1 9 USBGND 10 USBVDDO 1 2 3 Serial Port COM2 Connector CN6 COM2 RS 232 Mode Pin Signal Pin Signal 1 DCDB 2 RXB 3 TXB DTRB 5 Ground 6 DSRB 7 RTSB 8 CTSB 9 RIB 10 N C COM2 RS 422 Mode Pin Signal Pin Signal 1 TXD 2 RXD 3 TXD 4 RXD 5 N C 6 N C 7 N C 8 N C 9 Ground 10 N C COM2 RS 485 Mode Pin Signal Pin Signal 1 TXD 2 N C 3 TXD 4 N C Chapter 2 Hardware Installation 2 3 Embedded Controller AEC 6520 N C 6 N C N C 8 N C Ground 10 N C Note COM mode RS 232 422 485 selected by BIOS 2 4 Ethernet 10 100Base TX RJ 45 Phone Jack Connector CN13 Pin Signal Pin Signa 1 T 2 TX 3 TCT 4 NC 5 NC 6 RCT 7 RX 8 RX 9 LINK
4. Index 02h to 1 to exit the MB PnP Mode WatchDog Timer Configuration Registers LDN Index R W Reset Configuration Register or Action Al 02H W N A Configure Control 07H 71H R W 00H WatchDog Timer Control Register 07H 72H R W 00H WatchDog Timer Configuration Regis ter 07H 73H R W 00H WatchDog Timer Time out Value Register Configure Control Indexz02h This register is write only Its values are not sticky that is to say a hardware reset will automatically clear the bits and does not require the software to clear them Appendix A Programming the Watchdog Timer A 3 Embedded Controller AEC 6520 Bit Description 7 2 Reserved 1 Returns to the Wait for Key state This bit is used when the configuration sequence is completed 0 Resets all logical devices and restores configuration registers to their power on states WatchDog Timer Control Register Index 71h Default 00h Bit Description 7 WDT is reset upon a CIR interrupt 6 WDT is reset upon a KBC mouse interrupt 5 WDT is reset upon a KBC keyboard interrupt 4 WDT is reset upon a read or a write to the Game Port base address 3 2 Reserved 1 Force Time out This bit is self clearing 0 WDT Status 1 WDT value reaches 0 0 WDT value is not 0 WatchDog Timer Configuration Register Index 72h Default 00h Bit Description WDT Time out value select 1 Second 0 Minute 6 WDT output through KRST pulse enable 5 4 Reserved 3 0 Select the i
5. LED 10 ACT LED 11 SPD LED 12 43 3V 2 5 Serial Port COM1 Connector CN18 Pin Signal Pin Signal 1 DCDA 2 RXA 3 TXA 4 DTRA 5 Ground 6 DSRA 7 RTSA 8 CTSA 9 RIA 10 N C 2 6 CRT Display Connector CN19 Pin Signal Pin Signal 1 CRT RED 9 5V 2 CRT_GREEN 10 VGA Ground 3 CRT_BLUE 11 N C Chapter 2 Hardware Installation 2 4 Embedded Controller AEC 6520 4 N C 12 CRT SDA 5 VGA Ground 13 CRT HSYNC 6 VGA Ground 14 CRT VSYNC 7 VGA Ground 15 CRT SCL 8 VGA Ground 2 7 Installing Cables Take off the lid from the chassis by loosening the four screws D Chapter 2 Hardware Installation 2 5 Embedded Controller AEC 6520 H Installing VGA Cable Step 1 Take the VGA Cable from the accessory kit and twist the cap of port on AEC 6520 1 15 Step 2 Take the cable to pierce the aperture and then lock wtih corkscrews AP yg Chapter 2 Hardware Installation 2 6 Embedded Controller AEC 6520 B Installing COM1 Cable CN9 CN19 unnm 0 0 CN17 Bun lt CN16 8 CN CN18 CN11 zi x qg CN10 BN J S E CN13 i S 7 a CN15 amp B MPCI1 Ji Ge ABBAS D A 3 z 923 2 gpz EOD o ooo o o og 5 Z Step 1 Take the COM Cable and twist the cap of the port on AEC 6520 Chapter 2 Hardware In
6. RET Not Initial CLC RET Check Chip ENDP Read Configuration Data PROC NEAR MOV DX WORD PTR CS Cfg Port 04h OUT DX AL Appendix A Programming the Watchdog Timer A 7 Embedded Controller AEC 6520 MOV DX WORD PTR CS Cfg Port 06h IN AL DX RET Read Configuration Data ENDP Write Configuration Data PROC NEAR MOV DX WORD PTR CS Cfg_Port 04h OUT DX AL XCHG AL AH MOV DX WORD PTR CS Cfg_Port 06h OUT DX AL RET Write Configuration Data ENDP Superio Set Reg proc near push ax MOV DX WORD PTR CS Cfg_Port 04h mov al cl out dx al pop ax inc dx out dx al ret Superio Set Reg endp Set Logic Device proc near Appendix A Programming the Watchdog Timer A 8 Embedded Controller AEC 6520 Set Logic Device proc near push ax push cx xchg al cl mov cl 07h call Superio_Set_Reg pop cx pop ax ret Set_Logic_Device endp Select O2Eh gt Index Port 02Fh gt Data Port Cfg Port DB 087h 001h 055h 055h DW 02Eh 02Fh END Main Note Interrupt level mapping OFh Dh not valid OCh IRQ12 03h IRQ3 02h not valid 01h IRQ1 00h no interrupt selected Appendix A Programming the Watchdog Timer A 9 Embedded Controller AEC 6520 Appendix IO Information Appendix B I O Information B 1 Embedded Controller AEC 6520 B 1 I O Address Map Address Description User Address 000 01F DMA Controller 1 000 000F 020 03F Interrupt Controller 1 Maste
7. optimize your system performance Integrated Peripherals Use this menu to specify your settings for integrated peripherals Primary slave secondary slave keyboard mouse etc Power Management Setup Use this menu to specify your settings for power management HDD power down power on by ring KB wake up etc PnP PCI Configurations This entry appears if your system supports PnP PCI Chapter 3 Award BIOS Setup 3 3 Embedded Controller AEC 6520 PC Health Status This menu allows you to set the shutdown temperature for your system Frequency Voltage Control Use this menu to specify your settings for auto detect DIMM PCI clock and spread spectrum Load Fail Safe Defaults Use this menu to load the BIOS default values for the minimal stable performance for your system to operate Load Optimized Defaults Use this menu to load the BIOS default values that are factory settings for optimal performance system operations While AWARD has designated the custom BIOS to maximize performance the factory has the right to change these defaults to meet their needs Set Supervisor User Password Use this menu to set Supervisor User Passwords Save and Exit Setup Save CMOS value changes to CMOS and exit setup Exit Without Saving Abandon all CMOS value changes and exit setup You can refer to the AAEON BIOS Item Description pdf file in the CD for the meaning of each setting in this chapter Chapter 3 Award BIOS Setu
8. 0 WB Installing Power Cable Step 1 Take the Power cable to press and lock into power pipefitting then pierce the Power aperture and fixed CFD e Chapter 2 Hardware Installation 2 12 Embedded Controller AEC 6520 Step 2 Combine the chassis and then lock with screws Lol Chapter 2 Hardware Installation 2 13 Embedded Controller AEC 6520 2 8 Wallmount Kit Installation Step 1 Get the brackets ready and fasten appropriate two screws on each bracket After fastening the two brackets on the bottom lid of AEC 6520 the wallmount kit installation is finished Chapter 2 Hardware Installation 2 14 Embedded Controller AEC 6520 Chapter 2 Hardware Installation 2 15 Embedded Controller AEC 6520 Chapter Award BIOS Setup Chapter 3 Award BIOS Setup 3 1 Embedded Controller AEC 6520 3 1 System Test and Initialization These routines test and initialize board hardware If the routines encounter an error during the tests you will either hear a few short beeps or see an error message on the screen There are two kinds of errors fatal and non fatal The system can usually continue the boot up sequence with non fatal errors Non fatal error messages usually appear on the screen along with the following instructions Press F1 to RESUME Write down the message and press the F1 key to continue the boot up sequen
9. 9 30V Input With Phoenix Connector And Optional External AC Input Power Adapter e Wallmount design suit for industrial application e Windows XP Pro Windows XP Embedded and Linux Red Hat are Ready For Diverse Applications Chapter 1 General Information 1 3 Embedded Controller AEC 6520 1 3 Specifications System e CPU Intel Celeron M 1 0GHz Processor e Memory DDR SODIMM x 1 Max 1GB e VGA D sub 15 VGA Connector e Keyboard Mouse PS 2 Keyboard A Mouse e Ethernet 10 100Base TX Ethernet RJ 45 connector e Solid Storage Disk Internal Type Il CompactFlash slot x 1 e Serial port RS 232 x 1 COM1 RS 232 422 485 x 1 COM2 e USB USB2 0 x 1 e Watchdog Timer Generates a time out system reset e Power Supply DC Input 9V DC 30V DC AC Input External power adapter Optional Mechanical and Environmental e Construction Aluminum Alloy Chassis e Color Black e X Mounting Wallmount e Dimension 10 83 W x 7 82 H x 2 44 D 274 9 mm x 198 5 mm x 62 mm e Net weight 5 06 Ib 2 3 kg Chapter 1 General Information 1 4 Embedded Controller AEC 6520 e Gross weight 7 26 Ib 3 3 kg e Operating 59F 140 F 15 C 60 C Temperature e Operating 5 90 40 C non condensing Humidity e Vibration 5g rms 5 500Hz random operation CFD e Shock 50g peak acceleration 11msec duration CFD e EMC CE FCC Class A LO Connector Chapter 1 General Information 1 5 Embedded Controller
10. Embedded Controller AEC 6520 AEC 6520 Fanless Embedded Controller Intel ULV Celeron 1 0GHz Processors IP 65 Certified AEC 6520 Manual 1st Ed Sept 2008 Embedded Controller AEC 6520 Copyright Notice This document is copyrighted 2008 All rights are reserved The original manufacturer reserves the right to make improvements to the products described in this manual at any time without notice No part of this manual may be reproduced copied translated or transmitted in any form or by any means without the prior written permission of the original manufacturer Information provided in this manual is intended to be accurate and reliable However the original manufacturer assumes no responsibility for its use or for any infringements upon the rights of third parties that may result from its use The material in this document is for product information only and is subject to change without notice While reasonable efforts have been made in the preparation of this document to assure its accuracy AAEON assumes no liabilities resulting from errors or omissions in this document or from the use of the information contained herein AAEON reserves the right to make changes in the product design without notice to its users Embedded Controller AEC 6520 Acknowledgments All other products name or trademarks are properties of their respective owners Award is a trademark of Award Software International In
11. NGS Make sure the voltage of the power source is correct before connecting the equipment to the power outlet Position the power cord so that people cannot step on it Do not place anything over the power cord All cautions and warnings on the equipment should be noted If the equipment is not used for a long time disconnect it from the power source to avoid damage by transient over voltage Never pour any liquid into an opening This could cause fire or electrical shock Never open the equipment For safety reasons only qualified service personnel should open the equipment If any of the following situations arises get the equipment checked by service personnel a The power cord or plug is damaged b Liquid has penetrated into the equipment c The equipment has been exposed to moisture Embedded Controller AEC 6520 d The equipment does not work well or you cannot get it to work according to the user s manual e The equipment has been dropped and damaged f The equipment has obvious signs of breakage 15 DO NOT LEAVE THIS EQUIPMENT IN AN ENVIRONMENT WHERE THE STORAGE TEMPERATURE IS BELOW 20 C 4 F OR ABOVE 65 C 149 F IT MAY DAMAGE THE EQUIPMENT FCC This device complies with Part 15 FCC Rules Warning Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including inte
12. c CompactFlash is a trademark of the Compact Flash Association Intel and Celeron M are trademarks of Intel Corporation Microsoft Windows is a registered trademark of Microsoft Corp PC AT PS 2 and VGA are trademarks of International Business Machines Corporation All other product names or trademarks are properties of their respective owners Embedded Controller AEC 6520 Packing List Before you begin operating your PC please make sure that the following materials are enclosed e 1 AEC 6520 Embedded Controller e 1 Phoenix Power Connector e 2 Wallmount Brackets e 1 Screw Package e 1 CD ROM for manual in PDF format and drivers If any of these items should be missing or damaged please contact your distributor or sales representative immediately iii Embedded Controller AEC 6520 Safety amp Warranty Read these safety instructions carefully Keep this user s manual for later reference Disconnect this equipment from any AC outlet before cleaning Do not use liquid or spray detergents for cleaning Use a damp cloth For pluggable equipment the power outlet must be installed near the equipment and must be easily accessible Keep this equipment away from humidity Put this equipment on a firm surface during installation Dropping it or letting it fall could cause damage The openings on the enclosure are for air convection Protect the equipment from overheating DO NOT COVER THE OPENI
13. ce System configuration verification These routines check the current system configuration against the values stored in the CMOS memory If they do not match the program outputs an error message You will then need to run the BIOS setup program to set the configuration information in memory There are three situations in which you will need to change the CMOS settings 1 You are starting your system for the first time 2 You have changed the hardware attached to your system 3 The CMOS memory has lost power and the configuration information has been erased The AEC 6520 CMOS memory has an integral lithium battery backup for data retention However you will need to replace the complete unit when it finally runs down Chapter 3 Award BIOS Setup 3 2 Embedded Controller AEC 6520 3 2 Award BIOS Setup Awards BIOS ROM has a built in Setup program that allows users to modify the basic system configuration This type of information is stored in battery backed CMOS RAM so that it retains the Setup information when the power is turned off Entering Setup Power on the computer and press Del immediately This will allow you to enter Setup Standard CMOS Features Use this menu for basic system configuration Date time IDE etc Advanced BIOS Features Use this menu to set the advanced features available on your system Advanced Chipset Features Use this menu to change the values in the chipset registers and
14. e IPC market the newest Boxer series AEC 6520 has been introduced by AAEON AEC 6520 utilizes an Intel Celeron processor without a fan New Innovation for Entertainment Multimedia Domain In this era of information explosion the advertising of consumer products will not be confined to the family television but will also spread to high traffic public areas like department stores the bus transportation station the supermarket etc The advertising marketing industry will resort to every conceivable means to transmit product information to consumers Stable Design for Rugged Environment The AEC 6520 is designed for rugged environments due to the following reasons first it can withstand tough vibration testing up to 5G rms With the anti vibration hard drive device option the AEC 6520 can be used in high vibration environments In addition the AEC 6520 offers low power consumption system that while operating in ambient temperatures ranging from 15 to 60 C The MTBF Mean Time Before Failure rating states that the AEC 6520 can operate up to 50 000 hours at 35 C ambient temperature which indicates its careful and long life design The AEC 6520 is a standalone high performance controller designed for long life operation and with high reliability Chapter 1 General Information 1 2 Embedded Controller AEC 6520 1 2 Features e Fanless Design with Intel Celeron M 1 0GHz Processor e Wide Operating Temperature Design e DC
15. nterrupt level for WDT WatchDog Timer Time out Value Register Index 73h Default 00h Bit Description 7 0 WDT Time out value 7 0 Appendix A Programming the Watchdog Timer A 4 Embedded Controller AEC 6520 A 2 ITE8712 Watchdog Timer Initial Program Main MODEL SMALL CODE CALL Enter Configuration mode CALL Check Chip mov cl 7 call Set Logic Device time setting mov cl 10 10 Sec dec al Watch Dog Setting Timer setting mov al cl mov cl 73h call Superio Set Reg Clear by keyboard or mouse interrupt mov al OfOh mov cl 71h call Superio Set Reg unit is second mov al OCOH mov cl 72h call Superio_Set_Reg Appendix A Programming the Watchdog Timer A 5 Embedded Controller AEC 6520 game port enable mov cl 9 call Set Logic Device Initial OK CALL Exit Configuration mode MOV AH 4Ch INT 21h Enter Configuration Mode PROC NEAR MOV SI WORD PTR CS Offset Cfg Port MOV DX 02Eh MOV CX 04h Init 1 MOV AL BYTE PTR CS SI OUT DX AL INC SI LOOP Init_1 RET Enter Configuration Mode ENDP Exit Configuration Mode PROC NEAR MOV AX 0202h CALL Write Configuration Data Appendix A Programming the Watchdog Timer A 6 Embedded Controller AEC 6520 RET Exit Configuration Mode ENDP Check Chip PROC NEAR MOV AL 20h CALL Read Configuration Data CMP AL 87h JNE Not Initial MOV AL 21h CALL Read Configuration Data CMP AL 12h JNE Not Initial Need Initial STC
16. p 3 4 Embedded Controller AEC 6520 Chapter Driver Installation Chapter 4 Driver Installation 4 1 Embedded Controller AEC 6520 The AEC 6520 comes with a CD ROM that contains all drivers and utilities that meet your needs Follow the sequence below to install the drivers Step 1 Install Intel INF Update for Windows 9x 2003 Driver Step 2 Install Intel Extreme Graphics 2 Driver Step 3 Install Intel LAN Driver Step 4 Install Realtek AC97 codec Driver USB 2 0 Drivers are available to download by using Windows Update for both Windows XP and Windows 2000 For additional information regarding USB 2 0 support in Windows XP and Windows 2000 please visit www microsoft com hwdev usb Please read instructions below for further detailed installations Chapter 4 Driver Installation 4 2 Embedded Controller AEC 6520 4 1 Installation Insert the AEC 6520 CD ROM into the CD ROM Drive The Autorun program will run automatically You also can choose the drivers to install from step 1 to step 4 in order as following instructions Step 1 Install Intel INF Update for Windows 9x 2003 Driver 1 Click on the Step 1 Intel INF Update for Windows 9x 2003 folder and then double click on the Setup exe Follow the instructions that the window shows The system will help you install the driver automatically Step 2 Install Intel Extreme Graphics 2 Driver 1 Click on the Step 2 Intel Extreme Graphics 2
17. r 020 021 040 05F System Time 040 043 060 06F 8042 Keyboard Controller 060 064 070 07F Real time Clock NMI non maskable 070 073 Interrupt Mask 080 09F DMA Page Register 080 08F 0A0 0BF Interrupt Controller 2 0A0 0A1 0C0 0DF DMA Controller 2 0C0 0DF OFO OFF Math Coprpcessor OFO OFF 170 177 Secondary IDE Channel 170 177 1F0 1F7 Primary IDE Channel 1F0 1F7 2F8 2FF Serial Port 2 2F8 2FF 378 37F Parallel Printer Port 1 378 37F 3BO 3DF EGA VGA card 3B0 3DF 3F8 3FF Serial Port 1 3F8 3FF B 2 1 MB Memory Address Map Memory Address Description 00000 9FFFF System memory A0000 BFFFF VGA buffer C0000 CFFFF VGA BIOS E0000 FFFFF System BIOS Appendix B I O Information B 2 Embedded Controller AEC 6520 B 3 IRG Mapping Chart IRQO System Timer IRO8 System CMOS Real time clock IRQ1 Keyboard IRQ9 Microsoft ACPI Compliant system IRQ2 Cascade to IRO Controller IRQ10 Unused IRQ3 COM2 IRQ11 Unused IRQ4 COM1 IRQ12 PS 2 mouse IRQ5 Unused IRQ13 FPU IRQ6 Unused IRQ14 Primary IDE IRQ7 Printer IRQ15 Secondary IDE B 4 DMA Channel Assignments DMA Channel Function Available Available Unused Available Direct Memory Access Controller Available Available NIJA JIU TO O Available Appendix B I O Information B 3
18. rference that may cause undesired operation Caution There is a danger of explosion if the battery is incorrectly replaced Replace only with the same or equivalent type recommended by the manufacturer Dispose of used batteries according to the manufacturer s instructions and your local government s recycling or disposal directives Embedded Controller AEC 6520 Below Table for China RoHS Reguirements AAEON Boxer Industrial System K ERKE Pb Hg Cd Cr VI PBB PBDE x e O O O O x e O O O O x ei O O O O x O O O O O O O O O O O O O O O O SJ T 11363 2006 X SJ T 11363 2006
19. stallation 2 7 Embedded Controller AEC 6520 Step 2 Take the cable to pierce the aperture and then lock with corkscrews E Z B Installing COM2 Cable Step 1 Take the COM2 Cable from the accessory kit and twist the cap of port on AEC 6520 Chapter 2 Hardware Installation 2 8 Embedded Controller AEC 6520 Step 2 Take the cable to pierce the COM aperture and then lock with corkscrews H Installing LAN Cable Step 1 Take the LAN Cable from the accessory kit and twist the cap of port on AEC 6520 ITT W nnnnnnnn D UUUUUD i 1 8 Step 2 Take the cable to pierce the LAN aperture and then lock with Chapter 2 Hardware Installation 2 9 Embedded Controller AEC 6520 corkscrews 7 Ka m Installing USB Cable CN9 CN19 0 0 Bo CN17 CN16 Er s CN8 CN CN o Es CN13 4 CN15 JP2 MPCI1 JP1 e CN1 CN2 CN3 CN4 CN5 CN6 CN7 CN14 JP5 CN12 Chapter 2 Hardware Installation 2 10 Embedded Controller AEC 6520 Step 1 Take the USB Cable and twist the cap of the port on AEC 6520 I Step 2 Take the USB cable to press and lock into the board then pierce the USB aperture and lock with corkscrews Chapter 2 Hardware Installation 2 11 Embedded Controller AEC 652
20. this logical device KBC is determined by the state of pin 121 DTR1 at the falling edge of the system reset during power on reset Hardware Reset Wait for key string Any other I O transition cycle LO write to 2Eh N Is the data 87h Y Any other T O transition cycle r Check Pass key W O write to 2Eh N Next Data Y N Last Data Y MB PnP Mode There are three steps to complete the configuration setup 1 Enter the MB PnP Mode 2 Modify the data of configuration registers 3 Exit the MB PnP Mode Undesired result may occur if the MB PnP Mode is not exited normally Appendix A Programming the Watchdog Timer A 2 Embedded Controller AEC 6520 1 Enter the MB PnP Mode To enter the MB PnP Mode four special I O write operations are to be performed during Wait for Key state To ensure the initial state of the key check logic it is necessary to perform four write opera tions to the Special Address port 2EH Two different enter keys are provided to select configuration ports 2Eh 2Fh of the next step Address Port Data Port 87h 01h 55h 55h 2Eh 2Fh 2 Modify the Data of the Registers All configuration registers can be accessed after entering the MB PnP Mode Before accessing a selected register the content of Index 07h must be changed to the LDN to which the register belongs except some Global registers 3 Exit the MB PnP Mode Set bit 1 of the configure control register

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