Intel cc820 User manual

Intel®Desktop Board CC820
Product Guide
Order Number: 748473-002

Revision History
Revision Revision History Date
-001 First release of the Intel Desktop Board CC820 Product Guide. August 1999
-002 Second release of the Intel Desktop Board CC820 Product Guide. August 1999
If an FCC declaration of conformity marking is present on the board, the following statement applies:
FCC Declaration of Conformity
This device complies with Part 15 of the FCC Rules. 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 interference that
may cause undesired operation.
For questions related to the EMC performance of this product, contact:
Intel Corporation
5200 N.E. Elam Young Parkway
Hillsboro, OR 97124
1-800-628-8686
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee
that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and the receiver.
•Connect the equipment to an outlet on a circuit other than the one to which the receiver is connected.
•Consult the dealer or an experienced radio/TV technician for help.
Canadian Department of Communications Compliance Statement:
This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the
Radio Interference Regulations of the Canadian Department of Communications.
Le présent appareil numerique német pas de bruits radioélectriques dépassant les limites applicables aux appareils
numériques de la classe B prescrites dans le Réglement sur le broullage radioélectrique édicté par le ministére des
Communications du Canada.
Disclaimer
Intel Corporation (Intel) makes no warranty of any kind with regard to this material, including, but not limited to, the implied
warranties of merchantability and fitness for a particular purpose. Intel assumes no responsibility for any errors that may
appear in this document. Intel makes no commitment to update nor to keep current the information contained in this
document. No part of this document may be copied or reproduced in any form or by any means without prior written
consent of Intel.
An Intel®product, when used in accordance with its associated documentation, is "Year 2000 Capable" when, upon
installation, it accurately stores, displays, processes, provides, and/or receives date data from, into, and between the
twentieth and twenty-first centuries, including leap year calculations, provided that all other technology used in combination
with said product properly exchanges date data with it.
†Third-party brands and trademarks are the property of their respective owners.
Copyright 1999, Intel Corporation. All Rights Reserved

iii
Contents
1 Desktop Board Features
Manufacturing Options ......................................................................................................... 8
Components......................................................................................................................... 9
Microprocessor................................................................................................................... 10
Main Memory...................................................................................................................... 11
ECC Memory............................................................................................................. 11
Intel®820 Chipset............................................................................................................... 12
Intel®82820 Memory Controller Hub (MCH).............................................................. 12
Intel®82801AA I/O Controller Hub (ICH)................................................................... 12
Intel®82802AB Firmware Hub (FWH) ....................................................................... 12
Intel®82805AA Memory Translator Hub (MTH)......................................................... 12
Input/Output (I/O) Controller............................................................................................... 13
Real-Time Clock.................................................................................................................13
USB Support ...................................................................................................................... 14
PCI Enhanced IDE Interface .............................................................................................. 14
Expansion Slots.................................................................................................................. 14
Accelerated Graphics Port (AGP)....................................................................................... 14
Audio Subsystem (Optional)............................................................................................... 15
BIOS................................................................................................................................... 15
PCI Auto Configuration.............................................................................................. 15
IDE Auto Configuration.............................................................................................. 15
Security Passwords................................................................................................... 16
Enhanced Diagnostic LEDs................................................................................................ 16
Speaker.............................................................................................................................. 16
Battery................................................................................................................................ 16
Power Management Features ............................................................................................ 17
Wake on LAN Technology......................................................................................... 17
Instantly Available Technology................................................................................... 17
Estimating Standby Current .............................................................................. 19
Wake on Ring............................................................................................................ 20
Resume on Ring........................................................................................................ 20
2 Installing and Replacing Desktop Board Components
Before You Begin............................................................................................................... 21
How to Install and Remove the AGP Card and Retention Mechanism................................ 22
Install the AGP Card Retention Mechanism............................................................... 22
Install the AGP Card.................................................................................................. 23
Remove the AGP Card from the Retention Mechanism............................................. 24
Remove the AGP Card Retention Mechanism........................................................... 25
How to Install Memory........................................................................................................ 26
DIMM Installation Guidelines ..................................................................................... 26
Installing DIMMs........................................................................................................ 27
Removing DIMMs ...................................................................................................... 28
How to Install the I/O Shield ............................................................................................... 28
How to Install and Remove the Desktop Board .................................................................. 29

Intel Desktop Board CC820 Product Guide
iv
How to Install the Processor and the Grounded Processor Retention Mechanism ............. 30
Install the Grounded Processor Retention Mechanism .............................................. 30
Install the Processor.................................................................................................. 31
Remove the Installed Processor................................................................................ 32
How to Replace the Battery................................................................................................ 33
How to Connect the IDE Cable........................................................................................... 35
How to Set the BIOS Configuration Jumper ....................................................................... 36
How to Clear the Passwords .............................................................................................. 37
3 Upgrading the BIOS
Preparing for the Upgrade.................................................................................................. 39
Obtain the BIOS Upgrade File................................................................................... 39
Record the Current BIOS Settings............................................................................. 40
Create a Bootable Diskette........................................................................................ 40
Create the BIOS Upgrade Diskette............................................................................ 41
Upgrading the BIOS........................................................................................................... 41
Recovering the BIOS.......................................................................................................... 42
4 Using the Setup Program
BIOS Setup Program Modes.............................................................................................. 43
Maintenance Menu............................................................................................................. 44
Main Menu.......................................................................................................................... 45
Advanced Menu.................................................................................................................. 46
Boot Configuration Submenu..................................................................................... 46
Peripheral Configuration Submenu............................................................................ 47
IDE Configuration...................................................................................................... 49
IDE Configuration Submenus .................................................................................... 50
Diskette Configuration Submenu............................................................................... 51
Event Log Configuration Submenu............................................................................ 51
Video Configuration Submenu................................................................................... 52
Security Menu .................................................................................................................... 52
Power Menu....................................................................................................................... 53
Boot Menu.......................................................................................................................... 54
Exit Menu ........................................................................................................................... 55
5 Technical Reference
Desktop Board Connectors ................................................................................................ 57
Back Panel Connectors............................................................................................. 58
Midboard Connectors ................................................................................................ 59
Front Panel Connectors............................................................................................. 60
Desktop Board Resources.................................................................................................. 61
Memory Map.............................................................................................................. 61
DMA Channels........................................................................................................... 61
I/O Map...................................................................................................................... 62
Interrupts................................................................................................................... 64
A Error Messages and Indicators
BIOS Beep Codes.............................................................................................................. 65
Enhanced Diagnostic LEDs................................................................................................ 66
BIOS Error Messages......................................................................................................... 68

Contents
v
B Regulatory and Integration Information
Regulatory Compliance...................................................................................................... 71
Product Certification Markings............................................................................................ 72
Installation Precautions ...................................................................................................... 72
Installation Instructions.......................................................................................................73
Ensure Electromagnetic Compatibility (EMC) ............................................................ 73
Ensure Chassis and Accessory Module Certifications ............................................... 73
Prevent Power Supply Overload................................................................................ 74
Place Battery Marking on the Computer.................................................................... 74
Use Only for Intended Applications............................................................................ 74
Figures
1. Desktop Board Components............................................................................................... 9
2. Location of Standby Power Indicator................................................................................. 18
3. AGP Card with Retention Notch........................................................................................ 22
4. Installing the AGP Card Retention Mechanism.................................................................. 23
5. Removing the AGP Card................................................................................................... 24
6. Removing the AGP Card Retention Mechanism................................................................ 25
7. DIMM Socket Locations .................................................................................................... 27
8. Installing the I/O Shield .....................................................................................................28
9. Location of the Mounting Screw Holes.............................................................................. 29
10. Installing the Processor Retention Mechanism.................................................................. 30
11. Installing a Processor with a Passive Heatsink.................................................................. 31
12. Installing a Processor with an Active Fan Heatsink ........................................................... 32
13. Removing the Battery........................................................................................................ 34
14. Connecting the IDE Cable................................................................................................. 35
15. Location of the BIOS Configuration Jumper Block ............................................................ 36
16. Connector Groups.............................................................................................................57
17. Back Panel Connectors..................................................................................................... 58
18. Midboard Connectors........................................................................................................ 59
19. Front Panel Connectors .................................................................................................... 60
20. Location of the Enhanced Diagnostic LEDs ...................................................................... 66
Tables
1. Feature Summary ...............................................................................................................7
2. Manufacturing Options........................................................................................................ 8
3. Processors Supported by the Desktop Board.................................................................... 10
4. Supported DIMM sizes and configurations for CC820 (non-ECC specified)...................... 11
5. Standby Current Requirements......................................................................................... 19
6. Installation Guideline Summary......................................................................................... 26
7. Jumper Settings for the BIOS Setup Program Modes....................................................... 36
8. BIOS Setup Program Menu Bar........................................................................................ 44
9. BIOS Setup Program Function Keys................................................................................. 44
10. Maintenance Menu............................................................................................................ 44
11. Main Menu ........................................................................................................................ 45
12. Advanced Menu................................................................................................................46
13. Boot Configuration Submenu............................................................................................ 46
14. Peripheral Configuration Submenu ................................................................................... 47

Intel Desktop Board CC820 Product Guide
vi
15. IDE Configuration.............................................................................................................. 49
16. IDE Configuration Submenus............................................................................................ 50
17. Diskette Configuration Submenu....................................................................................... 51
18. Event Log Configuration Submenu.................................................................................... 51
19. Video Configuration Submenu........................................................................................... 52
20. Security Menu................................................................................................................... 52
21. Power Menu...................................................................................................................... 53
22. Boot Menu......................................................................................................................... 54
23. Exit Menu.......................................................................................................................... 55
24. System Memory Map ........................................................................................................ 61
25. DMA Channels.................................................................................................................. 61
26. I/O Map ............................................................................................................................ 62
27. Interrupts........................................................................................................................... 64
28. Beep Codes ...................................................................................................................... 65
29. Enhanced Diagnostic LED States ..................................................................................... 67
30. BIOS Error Messages ....................................................................................................... 68
31. Safety Regulations............................................................................................................ 71
32. EMC Regulations ..............................................................................................................71

7
1 Desktop Board Features
Table 1 describes the Desktop Board CC820’s major features.
Table 1. Feature Summary
Form Factor ATX (12.0 inches by 8.2 inches)
Processor Support for Intel®Pentium®III and Pentium II processors
Memory •Two 168-pin SDRAM Dual Inline Memory Module (DIMM) sockets
•Support for up to 512 MB system memory
•Single or double-sided DIMMs supported
Chipset Intel®820 Chipset, consisting of:
•Intel®82820 Memory Controller Hub (MCH)
•Intel®82801AA I/O Controller Hub (ICH)
•Intel®82802AB 4 Mbit Firmware Hub (FWH)
•Intel®82805AA Memory Translator Hub (MTH)
I/O Control SMSC LPC47M102 ultra I/O controller
Video AGP universal connector supporting 1X, 2X, and 4X AGP cards
Peripheral Interfaces •Two serial ports
•Two Universal Serial Bus (USB) ports
•One parallel port
•Two IDE interfaces with Ultra DMA and ATA/66 support
•One diskette drive interface
Expansion
Capabilities Six add-in card expansion slots:
•Five PCI bus add-in card connectors (SMBus routed to PCI connector – slot 2)
•One AGP universal connector
BIOS •Intel/AMI BIOS
•Intel®82802AB 4 Mbit Firmware Hub (FWH)
•Support for Advanced Power Management (APM), Advanced Configuration and
Power Interface (ACPI), Plug and Play, and SMBIOS.
Enhanced
Diagnostics Four dual-color LEDs on back panel
Hardware Monitor
Subsystem •Two fan sense inputs used to monitor fan activity
•Two pin header security feature for intrusion detection
•Remote diode temperature sense
•Voltage sense to detect out of range values
Instantly Available
PC •Support for PCI Local Bus Specification Revision 2.2
•Suspend to RAM (STR) support
•Wake on PS/2 keyboard and USB ports
continued

Intel Desktop Board CC820 Product Guide
8
Table 1. Feature Summary (continued)
Wake on LAN†
Technology
Connector
Support for system wake up using an add-in network interface card with remote
wake up capability
Wake on Ring
Connector Support for system wake up using an add-in telephony device, such as a modem
SCSI LED
Connector Allows add-in SCSI controllers to use the same LED as the onboard I/O controller
AMR Audio/Modem Riser connector
Manufacturing Options
Table 2 describes the Desktop Board CC820’s manufacturing options.
Table 2. Manufacturing Options
Audio Audio Codec ’97 (AC ’97) compatible. The audio subsystem includes Creative Labs’
ES1373 AC ’97 Digital Controller with Crystal Semiconductor’s CS4297 Stereo Audio
Codec.
✏NOTE
For information about Intel®desktop boards, including technical product specifications, BIOS
upgrades, and device drivers, go to the Intel World Wide Web site at:
http://support.intel.com/support/motherboards/desktop/

Desktop Board Features
9
Components
Figure 1 shows the major components on the desktop board.
OM08765
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K
J
I
H
L
M
TU
W
YXAA S
Z V OP
FF
EE
CCDD
R Q
GG
BB
EDB C
N
A Legacy CD-ROM connector (optional) R Diskette drive connector
B ATAPI-style CD-ROM connector (optional) S Front panel connector
C Audio/Modem Riser connector T Battery
D Telephony connector (optional) U Speaker
E Auxiliary line in connector (optional) V Chassis fan connector (Fan 1)
F Enhanced diagnostic LEDs W Intel 82801AA I/O Controller Hub (ICH)
G Back panel connectors X Wake on LAN†technology connector
H Processor fan connector (Fan 3) Y Chassis intrusion connector
I 242-contact slot connector (processor) Z Intel 82802AB Firmware Hub (FWH)
J Intel 82802 Memory Controller Hub (MCH) AA SCSI hard drive activity LED connector
K Intel 82805 Memory Translator Hub (MTH) BB Wake on Ring connector
L Chassis fan connector (Fan 2) CC BIOS configuration jumper block
M Main power connector DD SMSC LPC47M102 ultra I/O controller
N DIMM sockets EE Creative Labs ES1373 digital controller (optional)
O Secondary IDE connector FF AGP universal connector
P Primary IDE connector GG PCI slots
Q Alternate front panel power LED connector
Figure 1. Desktop Board Components
✏NOTE
Components labeled optional do not come on all Desktop Board CC820s.

Intel Desktop Board CC820 Product Guide
10
Microprocessor
The desktop board supports a single Intel Pentium III or Pentium II processor. Processors are not
included with the desktop board and must be purchased separately.
The processor connects to the desktop board through the 242-contact slot connector. When
mounted in the slot connector, the processor is secured by a retention mechanism attached to the
desktop board.
The desktop board supports the processors listed in Table 3.
Table 3. Processors Supported by the Desktop Board
Processor Type Processor Speed Host Bus Frequency L2 Cache Size
Pentium III processor 600 MHz
533 MHz 133 MHz 133 MHz 512 KB 512 KB
600 MHz
550 MHz
500 MHz
450 MHz
100 MHz
100 MHz
100 MHz
100 MHz
512 KB
512 KB
512 KB
512 KB
Pentium II processor 450 MHz
400 MHz
350 MHz
100 MHz
100 MHz
100 MHz
512 KB
512 KB
512 KB
For the latest information on processor support for the Desktop Board CC820, refer to the Intel
desktop board web site at:
http://support.intel.com/support/motherboards/desktop/
For instructions on installing or upgrading the processor, see Chapter 2.

Desktop Board Features
11
Main Memory
The CC820 desktop board has two DIMM sockets supporting 168-pin SDRAM DIMMs as defined
below. Also note that when installing memory in the CC820 desktop board, proper memory
installation guidelines must be followed as defined on Page 26.
The CC820 desktop board supports the following memory features:
•168-pin SDRAM DIMMs with gold-plated contacts
•100 MHz SDRAM (only)
•64 Mbit and 128 Mbit SDRAM component density (see Table 4 below)
•Minimum system memory: 32 MB
•Maximum system memory: 512 MB
•Unbuffered single or double-sided DIMMs
•Serial Presence Detect (SPD) memory (only)
•Non-ECC and ECC DIMMs (ECC DIMMs will operate in non-ECC mode only)
•3.3 V memory (only)
•Suspend to RAM
CAUTION
To be fully compliant with all applicable Intel®SDRAM memory specifications, the CC820 board
requires DIMMs that support the Serial Presence Detect (SPD) data structure. If non-SPD
DIMMs are installed, the system will not boot properly.
Table 4. Supported DIMM sizes and configurations for CC820 (non-ECC specified)
DIMM Size
Total Number of
SDRAM Components
on DIMM (see Figure 7) Non-ECC DIMM Organization* SDRAM Component Density
SDRAM
Component
Organization
32 MB 4* 4M x 64 64 Mbit 4M x 16
64 MB 8* 8M x 64 64 Mbit 8M x 8
64 MB 8 (double sided)* 8M x 64 64 Mbit 4M x 16
64 MB 4* 8M x 64 128 Mbit 8M x 16
128 MB 16 (double sided)* 16M x 64 64 Mbit 8M x 8
128 MB 8* 16M x 64 128 Mbit 16M x 8
128 MB 8 (double sided)* 16M x 64 128 Mbit 8M x 16
256 MB 16 (double sided)* 32M x 64 128 Mbit 16M x 8
* Non-ECC DIMMs are specified. ECC DIMM organization will be x72 and will have up to one additional SDRAM
component for each side of DIMM
ECC Memory
The CC820 board supports both ECC and non-ECC DIMMs (ECC DIMMs will operate in non-
ECC mode only).

Intel Desktop Board CC820 Product Guide
12
Intel®820 Chipset
The Intel 820 chipset for this product consists of the following devices:
•Intel 82820 Memory Controller Hub (MCH)
•Intel 82801AA I/O Controller Hub (ICH)
•Intel 82802AB Firmware Hub (FWH)
•Intel 82805AA Memory Translator Hub (MTH)
Intel®82820 Memory Controller Hub (MCH)
The MCH has these features:
•Auto-detection of SDRAM memory
•Support for a single AGP device
•133/100 MHz host bus
Intel®82801AA I/O Controller Hub (ICH)
The ICH has these features:
•Support for slot Peripheral Component Interface (PCI) bus
•Support for the Low Pin Count (LPC) interface
•Integrated IDE controller
•Support for USB
•General purpose I/O
•Power management logic
•Support for the System Management Bus
•Real-Time Clock
•Support for AC ’97 audio devices and modems
Intel®82802AB Firmware Hub (FWH)
The FWH has these features:
•System BIOS
•System security and manageability logic that enables protection for storing and updating of
platform information
•Random Number Generator (RNG) for use in security applications
Intel®82805AA Memory Translator Hub (MTH)
The MTH has these features:
•Support for 100 MHz DIMMs
•Support for 64 Mb and 128 Mb SDRAM component densities

Desktop Board Features
13
Input/Output (I/O) Controller
The SMSC LPC47M102 ultra I/O controller handles the exchange of information between the
processor and external devices, such as a mouse, keyboard, or printer that are connected to the
computer. The controller features the following:
•Two serial ports
•One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP)
support
•Mouse and keyboard controller
•Diskette drive controller supporting two drives on one cable
•MIDI/Game port
•Fan control
Real-Time Clock
The desktop board has a time-of-day clock and 100-year calendar that will rollover to 2000 at the
turn of the century. A battery on the desktop board keeps the clock current when the computer is
turned off.
✏NOTE
The recommended method of accessing the date in systems with Intel desktop boards is indirectly
from the Real-Time Clock (RTC) via the BIOS. The BIOS on Intel desktop boards contains a
century checking and maintenance feature that checks the least two significant digits of the year
stored in the RTC during each BIOS request (INT 1Ah) to read the date and, if less than 80 (i.e.,
1980 is the first year supported by the PC), updates the century byte to 20. This feature enables
operating systems and applications using the BIOS date/time services to reliably manipulate the
year as a four-digit value.
For more information about the year 2000 capability of systems with Intel desktop boards, see the
Intel World Wide Web site:
http://support.intel.com/support/year2000/index.htm

Intel Desktop Board CC820 Product Guide
14
USB Support
The desktop board has two USB ports. You can connect two USB peripheral devices directly to
the computer without an external hub. To attach more than two devices, connect an external hub to
either of the built-in ports. The desktop board supports the universal host controller interface
(UHCI) and takes advantage of standard software drivers written to be compatible with UHCI.
✏NOTE
Computer systems that have an unshielded cable attached to a USB port might not meet FCC
Class B requirements, even if no device or a low-speed USB device is attached to the cable. Use a
shielded cable that meets the requirements for a full-speed USB device.
PCI Enhanced IDE Interface
The PCI enhanced IDE interface handles the exchange of information between the processor and
peripheral devices like hard disks, CD-ROM drives, and Iomega Zip†drives inside the computer.
The interface supports:
•Up to four IDE devices (such as hard drives)
•ATAPI devices (such as CD-ROM drives)
•PIO Mode 3 and PIO Mode 4 devices
•Ultra ATA/33 and Ultra ATA/66
•Support for laser servo (LS-120) drives
Expansion Slots
The desktop board has five PCI expansion slots, an AGP universal connector, and an AMR
connector.
Accelerated Graphics Port (AGP)
The AGP is a high-performance interface for graphics-intensive applications, such as 3D graphics.
AGP is independent of the PCI bus and is intended for exclusive use with graphical display
devices.
The AGP universal connector supports AGP 1X, 2X, and 4X add-in cards. The AGP card
retention mechanism is used only with cards with retention notches (see Figure 3 on Page 22). For
information about installing the AGP card retention mechanism and an AGP card, see Chapter 2.

Desktop Board Features
15
Audio Subsystem (Optional)
The audio subsystem features the following:
•Creative Labs ES1373 digital controller with Crystal Semiconductor CS4297 (A) codec
•Back panel and onboard audio connectors
✏NOTE
The line out connector, located on the back panel, is designed to power either headphones or
amplified speakers only. Poor audio quality may occur if passive (non-amplified) speakers are
connected to this output.
Audio drivers and utilities are available from Intel’s World Wide Web site:
http://support.intel.com/support/motherboards/desktop/
BIOS
The BIOS provides the power-on self-test (POST), the BIOS Setup program, the PCI and IDE
auto-configuration utilities, and the video BIOS. The BIOS is stored in the Intel 82802AB
Firmware Hub.
The BIOS can be upgraded by following the instructions in Chapter 3.
PCI Auto Configuration
If you install a PCI add-in board in your computer, the PCI auto-configuration utility in the BIOS
automatically detects and configures the resources (IRQs, DMA channels, and I/O space) for that
add-in board. You do not need to run the BIOS Setup program after you install a PCI add-in board.
IDE Auto Configuration
If you install an IDE device (such as, a hard drive) in your computer, the IDE auto-configuration
utility in the BIOS automatically detects and configures the device for your computer. You do not
need to run the BIOS Setup program after installing an IDE device.

Intel Desktop Board CC820 Product Guide
16
Security Passwords
The BIOS includes security features that restrict whether the BIOS Setup program can be accessed
and who can boot the computer. A supervisor password and a user password can be set for the
Setup and for booting the computer, with the following restrictions:
•The supervisor password gives unrestricted access to view and change all Setup options. If
only the supervisor password is set, pressing <Enter> at the password prompt of Setup gives
the user restricted access to Setup.
•If both the supervisor and user passwords are set, you must enter either the supervisor
password or the user password to access Setup. Setup options are then available for viewing
and changing depending on whether the supervisor or user password was entered.
•Setting a user password restricts who can boot the computer. The password prompt is
displayed before the computer is booted. If only the supervisor password is set, the computer
boots without asking for a password. If both passwords are set, you can enter either password
to boot the computer.
Enhanced Diagnostic LEDs
Four dual-colored enhanced diagnostic LEDs are located on the backpanel. The LEDs report
POST failures. See Page 66 for information about the LEDs.
Speaker
A 47 Ωinductive speaker is mounted on the desktop board. The speaker provides audible error
code (beep code) information during the power-on self-test (POST).
Battery
A battery on the desktop board keeps the values in CMOS RAM and the clock current when the
computer is turned off. See Chapter 2 for instructions on how to replace the battery.

Desktop Board Features
17
Power Management Features
Power management is implemented at several levels, including:
•Software support:
Advanced Power Management (APM)
Advanced Configuration and Power Interface (ACPI)
•Hardware support:
Wake on LAN technology
Instantly Available technology
Wake on Ring
Resume on Ring
If the board is used with an ACPI-aware operating system, the BIOS can provide ACPI support.
Otherwise, it defaults to APM support.
The BIOS supports ACPI provided the operating system is ACPI-aware. Otherwise, the BIOS
defaults to APM.
Wake on LAN Technology
The Wake on LAN technology connector can be used with PCI bus network adapters that have a
remote wake-up connector. Network adapters that are PCI 2.2 compliant assert the wake-up signal
using the PCI bus signal PME# (pin A19 on the PCI bus connectors). See Figure 18 on Page 59 for
the location of the Wake on LAN technology connector on the desktop board.
CAUTION
For Wake on LAN technology, the 5-V standby line for the power supply must be capable of
providing adequate +5-V standby current. Failure to provide adequate standby current when
implementing Wake on LAN technology can damage the power supply.
Instantly Available Technology
Instantly Available technology enables the board to enter the ACPI S3 (Suspend-to-RAM) sleep
state. While in the S3 sleep state, the computer will appear to be off. When signaled by a wake-up
device or event, the system quickly returns to its last known awake state.
The desktop board standby power indicator, shown in Figure 2 on Page 18, is lit when the memory
modules and PCI bus connectors have power, even when the computer appears to be off.
If the system has a dual-colored power LED on the front panel, the sleep state is indicated by the
LED turning amber. For more information about front panel LED states, see the Intel®Desktop
Board CC820 Technical Product Specification.

Intel Desktop Board CC820 Product Guide
18
OM08766
DS7E1
Figure 2. Location of Standby Power Indicator
CAUTION
If the standby current necessary to support multiple wake events from the PCI and/or USB buses
exceeds power supply capacity, the desktop board may lose register settings stored in memory, etc.
Calculate the standby current requirements using the steps described below.
Power supplies used with this desktop board must be able to provide enough standby current to
support the standard Instantly Available (ACPI S3 sleep state) configuration as outlined in Table 5.
Some values are set per specifications such as PCI 2.2. The values given in the table for Instantly
Available are for a system containing a single wake-enabled PCI (or AGP) device and five non-
wake devices. Actual measurements may vary.

Desktop Board Features
19
Estimating Standby Current
To estimate the amount of stand by current required for a particular system configuration:
1. From the PCI 2.2 row, determine the number of supported wake-enabled adapters required
(PCI and AGP) and multiply by 375 mA.
2. Determine the number of non-wake adapters and multiply by 20 mA.
3. Total the values derived from steps 1 and 2 and replace the PCI 2.2 value (currently 475 mA)
in the table with the new value.
4. Add the rows to the estimated standby current required to support Instantly Available
technology.
5. Add the current required to support the optional features.
6. Total the estimated standby current required to support Instantly Available technology and the
current required to support the optional features.
Table 5. Standby Current Requirements
Description Current Requirements (mA)Instantly Available Current
Support (Estimated) Total for CC820 desktop board 695
Description Current Requirements (mA)
AMR* 150
PS/2 Ports* 300
Optional Current Support
(Add to Instantly Available total.)
(See instructions above.)
USB Ports* 507.5 (max)
* Dependent upon system configuration
✏NOTE
PCI requirements are calculated by totaling the following:
•One wake-enabled device @ 375 mA
•Five non wake-enabled devices @ 20 mA each
PS/2 Ports requirements per the IBM PS/2 Port Specification (Sept 1991):
•Keyboard @ 275 mA
•Mouse @ 70 mA
USB requirements are calculated by totaling the following:
•One wake-enabled device @ 500 mA
•USB hub @ 100 mA
•Three USB non-wake-enabled devices @ 2.5 mA each
The USB ports are limited to a combined total of 700 mA.

Intel Desktop Board CC820 Product Guide
20
Wake on Ring
The operation of Wake on Ring can be summarized as follows:
•Powers up the computer from either APM soft-off mode or the ACPI S3 state.
•Requires two calls to access the computer:
The first call powers up the computer.
The second call enables access (when the appropriate software is loaded).
•Detects incoming call differently for external as opposed to internal modems:
For external modems, hardware on the desktop board monitors the ring indicate (RI) input
of serial port A (serial port B does not support this feature).
For internal modems, a cable must be routed from the modem to the Wake on Ring
connector.
See Figure 18 on Page 59 for the location of the Wake on Ring connector on the desktop board.
Resume on Ring
The operation of Resume on Ring can be summarized as follows:
•Resumes operation from either the APM sleep mode or the ACPI S1 state
•Requires only one call to access the computer
•Detects incoming call similarly for external and internal modems; does not use the Wake on
Ring connector
•Requires modem interrupt be unmasked for correct operation