Desktop Board
VC820
Specification Update
Release Date: May 2001
Order Number: 738244-009
The Intel Desktop Board VC820 may contain design defects or errors known as errata which
may cause the product to deviate from published specifications. Current characterized errata are
documented in this Specification Update.
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The VC820 desktop board may contain design defects or errors known as errata whic h may cause the product to deviate from
published specifications. Current characterized errata are available on request.
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Copyright 2001, Intel Corporation. All rights reserved.
CONTENTS
REVISION HISTORY...................................................................................................................................v
PREFACE...................................................................................................................................................vi
Specification Update for Intel Desktop Boards VC820
GENERAL INFORMATION ..........................................................................................................................3
SPECIFICATION CHANGES .......................................................................................................................5
ERRATA.......................................................................................................................................................9
DOCUMENTATION CHANGES .................................................................................................................10
VC820 SPECIFICATION UPDATE
REVISION HISTORY
Date of Revision Version Description
November 1999 -001 This document is the fi rst Specification Update for the
December 1999 -002 Updated revision level tabl es i n the General Information secti on.
April 2000 -003 Added Specification Changes 1.
August 2000 -004 Added Specification Change 2 and Document Change 1.
September 2000 -005 Added Erratum 1.
October 2000 -006 Added Documentation Changes 2,3.
February 2001 -007 Removed BIOS/Errata c ross reference table, Added Errat um 2.
April 2001 -008 Added Documentation Change 4.
May 2001 -009 Added Erratum 3.
Intel
Desktop Board VC820.
v
VC820 SPECIFICATION UPDATE
i
PREFACE
This document is an update to the specifications contained in the
Product Specific at i on
(Order number 737611). It is intended for hardware system manufac t urers and
software developers of applications, operating systems, or tools. It will contain Specification Changes,
Errata, Specification Clarifications, and Documentation Changes.
Refer to the
Pentium
III Processor Specification Update
concerning the Pentium III process or. Items contained in the
either do not apply to the VC820 desktop board or have been worked around are noted in this doc um ent.
Otherwise, it should be assumed that any processor errata for a given stepping are applicable to the PBA
revision(s) associ at ed wi th that stepping.
Refer to the
Intel
Celeron™ Processor Spec i fication Update
updates concerning the Intel Cel eron processor. Items cont ai ned i n the
Update
that either do not apply to t he Des ktop Board VC820 or have been worked around are noted in this
document. Otherwise, it should be assumed that any proc essor errata for a given stepping are appli cable to
the PBA revision(s) associated with t hat s tepping.
Refer to the
Intel
82820 Chipset: 82820 Memory Controll er Hub (M CH) Specification Update
290630) for specification updates concerning the 82820 MCH Controller. Items contained in the
Specification Update
that either do not apply to t he V C820 desktop board or have been worked around are
noted in this document. Otherwise, it should be assum ed that any MCH errata for a given st eppi ng are
applicable to the PBA revision(s) associat ed wit h t hat stepping.
Refer to the
Intel
82801 I/O Controller Hub (ICH) Specification Update
specification updates concerning the 82801 I/O Controller Hub. Items contained in the
Specification Update
that either do not apply to t he V C820 desktop board or have been worked around are
noted in this document. Otherwise, it should be assum ed that any ICH errata for a given st eppi ng are
applicable to the Printed Board Assembly (PBA) revision(s) ass oc i at ed with that stepping.
Refer to the
Intel
82802 Firmware Hub (FWH) Specificati on Updat e
updates concerning the 82802 Firmware Hub. Items contained in the
that either do not apply to t he V C820 desktop board or have been worked around are noted in this document.
Otherwise, it should be assumed that any ICH errata for a giv en stepping are applicable to the Print ed B oard
Assembly (PBA) revision(s) associated wit h t hat stepping.
Intel Desktop Board VC820 Technical
(Order number 244453) for specificati on updates
Pentium III Processor Specification Update
(Order number 243748) for specificati on
Intel Celeron Processor S pec i fication
(Order Number
82820 MCH
(Order Number 290677) for
Intel 82801 ICH
(Order Number TBD) for specification
Intel 82802 FWH Specification Update
that
Nomenclature
Specification Changes are modifications to t he current published specifications. Thes e c hanges will be
incorporated in the next release of the specifications.
Errata are design defects or errors. Characterized errata may cause t he VC820 desktop board’s behavior to
deviate from published spec i fications. Hardware and soft ware des i gned to be used with any given Printed
Board Assembly (PBA) and BIOS revision level must assume that all errata document ed f or that PBA and
BIOS revision level are present on all desktop boards.
Specification Clarifications des cribe a specification in greater detail or further highlight a spec i fication’s
impact to a complex design situation. These clarifications will be incorporated in the next release of the
specifications.
Documentation Changes include typos, errors, or omis sions from the current publ i shed specifications.
These changes will be incorporated in the next release of the specif ications.
v
Specification Update for
Intel
Desktop Boards VC820
VC820 SPECIFICATION UPDATE
GENERAL INFORMATION
Basic Intel Desktop Board VC820 Identification Information
AA Revision
744044-401 744045-401 VC82010A.86A.0014.P03 1-7
744044-402 744045-402 VC82010A.86A.0014.P03 1-7
744044-403 744045-403 VC82010A.86A.0016.P04 1-7
744044-407 744045-407 VC82010A.86A.0031.P11 1-7
744044-408 744045-408 VC82010A.86A.0036.P16 1-7
NOTES:
1. The PBA number or AA number is found on a small label on the component side of the board.
2. The 82820 Chipset kit used on this PBA revision consists of three components as follows:
Device Stepping S-Spec Numbers
82820 MCH B1 SL3FT
82801AA ICH B1 SL3MA
82802AB FWH A0 SB48
3. The following errata are contained in the
Pentium III processor and either do not apply to the Desktop Board VC820 or have been worked-around in this PBA and/or
BIOS revision: 3. All other errata associated with the processor apply to this PBA revision.
4. The following errata are contained in the
Celeron processor and either do not apply to the Desktop Board VC820 or have been worked-around in this PBA and/or
BIOS revision: None. All other errata associated with the processor apply to this PBA revision.
5. The following items are contained in the
290630) and either do not apply to the Desktop Board VC820 or have been worked around in this PBA and/or BIOS
revision: None. All other errata associated with the MCH apply to this PBA revision.
6. The following items are contained in the
either do not apply to the Desktop Board VC820 or have been worked around in this PBA and/or BIOS revision: None. All
other errata associated with the ICH apply to this PBA revision.
7. The following items are contained in the
do not apply to the Desktop Board VC820 or have been worked around in this PBA and/or BIOS revision: None. All other
errata associated with the FWH apply to this PBA revision.
PBA Revision
Intel
Intel
Intel
BIOS Revision
Pentium
III Processor Specification Update
Intel
Celeron™ Processor Specification Update
82820 Memory Controller Hub (MCH) Specification Update
82801 I/O Controller Hub Specification Update
82802 Firmware Hub Specification Update
(Order Number 244453) for the
(Order Number 243748) for the
(Order Number TBD) and either
Notes
(Order Number
(Order Number 290677) and
3
VC820 SPECIFICATION UPDATE
Summary Table of Changes
The following table indicates the Specification Changes, Errata, Specificat i on Cl ari fications, or Documentation
Changes which apply to the VC820 des k top board. Intel intends to fi x some of the errata in a future rev i sion
of the desktop board, and to ac c ount for the other outstanding is s ues through documentation or specification
changes as noted. This tabl e uses the following notations :
CODES USED IN SUMM ARY TABLE
Doc: Document change or update that will be implemented.
Fix: This erratum is intended to be f i xed in a future revision of the desktop board,
Fixed: This erratum has been previously fixed.
NoFix: There are no plans to fix this erratum.
Shaded: This erratum is either new or modified from the previous versi on of the document.
NO. PLANS SPECIFICATION CHANGES
1 Doc Diagnostic LED display changes
2 Doc Addition of new feature, fast booting systems with Intel® Rapid BIOS BOOT
NO. PLANS ERRATA
1 Fix Some SCSI host bus adapt ers may not boot to the hard disk dri ve with a bootable
CD-ROM drive attached
2 Fixed A heavily loaded PCI bus may cause excessive noise on the NMI signal to the proces sor
3 Fixed Intel Pentium III processor Erratum E76
NO. PLANS DOCUMENTATION CHANGES
1 Doc Change to description of BIOS main menu memory option
2 Doc Change to description of sec tion 1.6.4, Real-Time Clock, CMOS SRAM, and Battery
3 Doc Change to description of Sec t i on 4.4.4.1, IDE Configuration S ub-Submenus
4 Doc Change to description of Sec t i on 1.5.2, Memory Features
driver, or BIOS.
4
VC820 SPECIFICATION UPDATE
SPECIFICATION CHANGES
The Specification Changes l i sted in this section appl y to the
Specification
that specificat i on.
(Order Number 737611). All Specification Changes will be inc orporat ed int o a future version of
1. Diagnostic LED Displ ay Changes
In Section 5.6, Enhanced Diagnostics, Table 85 will be updated to reflect the following changes of the
diagnostic LED’s.
Table 85. Diagnostic LED Codes
VC820 Motherboard Technical Product
Display BIOS Operation Display
Amber
Amber
Amber
Amber
Green
Amber
Amber
Amber
Amber
Green
Amber
Amber
Green
Green
Amber
Amber
Amber
Amber
Green
Amber
Green
Amber
Green
Amber
Amber
Green
Green
Amber
Green
Green
Green
Amber
Power on, starting
BIOS
Recovery mode
Processor, cache, etc.
Memory, auto-size,
shadow, etc.
PCI bus initialization
Video
IDE bus initialization
USB initialization
Amber
Amber
Amber
Green
Green
Amber
Amber
Green
Amber
Green
Amber
Green
Green
Green
Amber
Green
Amber
Amber
Green
Green
Green
Amber
Green
Green
Amber
Green
Green
Green
Green
Green
Green
Green
BIOS Operation
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
Reserved
Booting operating
system
5
VC820 SPECIFICATION UPDATE
2. Addition of New Feat ure, Fast Booting Systems With Intel® Rapid
BIOS Boot
Section 3.8, Overview of B IOS Features will be added. All subsequent sec tions will be renumbered
accordingly:
3.8 Fast Booting Systems with Intel Rapid BIOS Boot
There are three factors that affect system boot speed:
• Selecting and configuring peripherals properly
®
• Using an optimized BIOS, such as the Intel
• Selecting a compatible operating system
The BIOS is not configured by default to boot at the fastest possible speed. Empirical
measurements have shown that some Intel
described above, can complete POST (Power On Self Test) in six seconds or less and
*
boot to an active Microsoft Windows
Millennium (Me) operating system in
21 seconds.
In addition to the appliance-like speed that benefits end users, fast booting systems can
also increase an OEM’s manufacturing line throughput.
Rapid BIOS
®
Desktop boards, when optimized as
3.8.1 Peripheral Selection and Configuration
The following techniques will help improve system boot speed:
• Choose a hard drive with parameters, such as a “power-up to data ready” of less
than eight seconds which will minimize hard drive startup delays. The Western
Digital Caviar AA or BA series are examples of drives that meet this parameter.
• Select a CD-ROM drive with a fast initialization rate; variations can influence
POST times.
• Eliminate unnecessary features such as video-company-logo displaying, screen
repaints, or mode changes. These all add time in the boot process. The Plug and
Play communication between the video BIOS and the monitor shows time
variances.
• Try different monitors. Some monitors initialize more quickly, thereby enabling
the system to boot more quickly.
6
VC820 SPECIFICATION UPDATE
3.8.2 Intel® Rapid BIOS Boot
There are several BIOS settings, which if adjusted, can reduce the execution time of the
POST:
• Set the hard disk drive as the first boot device. As a result, the POST will not seek
a diskette drive (saving about one second from the POST time) or a CD-ROM drive
(saving about two seconds).
• Disable Quiet Boot to eliminate the logo splash screen. This could save several
seconds of painting complex graphic images and changing video modes.
®
• Make sure the Intel
Rapid BIOS Boot option (in the Boot menu of the BIOS Setup
Program) is enabled (this is typically the default setting). This feature bypasses
memory count and floppy seek.
• Disable the LAN feature PXE (Preboot eXecutable Environment) if it will not be
used. Doing so can reduce up to four seconds of option ROM boot time.
NOTE
✏
It is possible to optimize the boot process to the point where the system boots so
®
quickly that the Intel
Logo Screen (or a custom logo splash screen) will not be
seen. Monitors and hard disk drives with minimum initialization times can also
contribute to a boot time that might be so fast that necessary logo screens and
POST messages cannot be seen. If this should occur, it is possible to introduce a
programmable delay ranging from 3 to 30 seconds (using the Hard Disk PreDelay feature of the Advanced menu in the IDE Configuration Submenu of the
BIOS Setup Program).
For information about Refer to
IDE Configuration Submenu in the BIOS Setup Program Table 67, page 102
3.8.3 Operating System
3.8.3.1
Selection
The Microsoft Windows* Millennium Edition (Windows Me) operating system
has built-in capabilities for making PCs boot more quickly. For additional
information, see the following URL:
http://www.microsoft.com/hwdev/newpc/fast-boot.htm
7
VC820 SPECIFICATION UPDATE
3.8.3.2
Optimization
To speed operating system availability at boot time, limit the number of
applications that load into the system tray or the task bar.
NOTE
✏
The Intel® Rapid BIOS Boot technology is only available with BIOS revision
VC82010A.86A.0026.P09 or later.
8
VC820 SPECIFICATION UPDATE
ERRATA
1. Some SCSI Host Bus Adapters May Not Boot to The Hard Disk
Drive With a Bootable CD-ROM Drive Attached
PROBLEM: If a bootable CD-ROM is attac hed to the SCSI host bus adapter (HB A ) and set as bootable in the
setup menu of the SCSI HB A wi thout bootable media installed, the system may not boot to the attached hard
drive.
IMPLICATION: Users who wish to utilize a bootable SCSI CD-ROM in conjunction with a bootable hard drive
on an add-in SCSI host bus adapter may not be able to boot to the hard drive if the SCSI adapter is set t o
recognize the CD-ROM as a bootable dev i c e.
WORKAROUND: Enable the CD-ROM as a bootable S CS I device only when using bootable m edi a.
STATUS: This erratum will be fixed in a future BIOS revision.
2. A Heavily Loaded PCI Bus May Cause Excessi ve Noise on The NMI
Signal to The Processor
PROBLEM: If the PCI bus is heavily loaded, exces sive noise on the NMI signal to the proc essor may cause
system hangs or blue screens.
IMPLICATION: Users requiring multiple P CI add in cards that generate heavy traff i c on the PCI bus and who
are using higher frequency Pentium
WORKAROUND: None.
STATUS: This erratum was fixed in PBA revision 744044-403.
III processors, may experience system hangs or blue screens.
3. Intel Pentium III Processor Erratum E76
PROBLEM: For a complete description of the P entium
Specification Update, order number 244453 found at http://developer.intel.com/design/PentiumIII/specupdt/
IMPLICATION: For a complete description of the Pentium III processor erratum E76, see the Pentium III
Specification Update, order number 244453 found at http://developer.intel.com/design/PentiumIII/specupdt/
WORKAROUND: Update the VC820 desktop board with BIOS revision VC82010A.86A. 0040.P17.
STATUS: This erratum was addressed in BIOS revision V C82010A.86A.0040.P17.
III processor erratum E76, see the Pentium III
.
.
9
VC820 SPECIFICATION UPDATE
DOCUMENTATION CHANGES
1. Change to Description of BI O S M ai n Menu Memory Option
In section 4.3, Table 62, BIOS Main Menu will be changed as follows:
Table 1. Main Menu
Feature Options Description
BIOS Version No options Displays the version of the BIOS.
Processor Type No options Displays processor type.
Processor Speed No options Displays processor operating
frequency.
System Bus
Frequency
Cache RAM No options Displays the size of second-level cache
Total Memory No options Displays the total amount of RAM.
Memory Bank 0
Memory Bank 1
Language • English (US) (default)
Processor Serial
Number
Memory
Configuration
System Time Hour, minute, and second Specifies the current time.
System Date Month, day, and year Specifies the current date.
No options Displays the of the system front side
bus frequency.
and whether it is ECC-capable.
No options Displays type of RIMM installed in each
memory bank.
Selects the default language used by
• German
• French
• Italian
• Spanish
• Disabled (default)
• Enabled
• Non-ECC
• ECC (default)
the BIOS.
Enables and disables the processor
serial number.
Allows selection of ECC-mode memory
operation if ECC-type memory is
installed.
2. Change to Description of Sect i on 1. 6.4, Real-Time Clock, CMOS
SRAM, and Battery
The first note in section 1.6. 4 will be changed in its entirety as follows:
✏ NOTE
If the battery and AC power fail, custom defaults if previously saved, will be
loaded into CMOS RAM at power-on.
10
VC820 SPECIFICATION UPDATE
3. Change to Description of Sect i on 4. 4.4.1, IDE Configuration SubSubmenus
Table 68 in section 4.4.4.1 will be changed in its ent iret y as follows:
Table 68. IDE Configuration Sub-Submenus
Feature Options Description
Type • None
• User
• Auto (default)
• CD-ROM
• ATAPI Removable
• Other ATAPI
• IDE Removable
LBA Mode
Control
Multi-sector
Transfers
(Note)
• Disabled
(Note)
• Enabled (default)
• Disabled
• 2 Sectors
• 4 Sectors
• 8 Sectors
• 16 Sectors (default)
PIO Mode
(Note)
• Auto (default)
• 0
• 1
• 2
• 3
• 4
Ultra DMA
(Note)
• Disabled (default)
• Mode 0
• Mode 1
• Mode 2
• Mode 3
• Mode 4
Note: The setting of
Type
determines whether these feat ures display.
Specifies the IDE configuration mode for IDE
devices.
User
allows the LBA Mode Control, Multisector Transfers, PIO Mode, and Ultra DMA
features to be changed.
Auto
automatically selects the values for the
LBA Mode Control, Multi-sector Transfers,
PIO Mode, and Ultra DMA features.
Enables or disables LBA Mode Control.
Specifies number of sectors per block for
transfers from the hard disk drive to memory.
Check the hard disk drive’s specifications for
optimum setting.
Specifies the transfer mode.
Specifies the Ultra DMA mode for the drive.
Auto
Note that when
is selected in PIO Mode,
the BIOS sets Ultra DMA to the fastest speed
supported. If the drive doesn’t support Ultra
DMA, the BIOS sets Ultra DMA to
Disabled
and the fastest supported PIO mode is used
instead.
4. Change to Description of Sect i on 1. 5.2, Memory Features
Section 1.5.2, Memory Features will be changed in its entirety as follows:
11
VC820 SPECIFICATION UPDATE
1.5.2 Memory Features
The Intel 82820 Memory Controller Hub (MCH) integrates a single Rambus* channel
as an electrically pipelined serial bus (16 data bits in width) with uniform impedance of
28 ohms and single-ended termination. This Rambus channel is capable of providing a
processor-to-memory bandwidth up to 1.6 GB/sec.
The board supports the following memory features:
• Up to two 2.5 V, 184-pin, RIMM* modules
• 512 MB maximum onboard capacity using 128 or 144 Mbit technology
• Single or double-sided RIMM modules
• Serial Presence Detect (SPD) memory only
• Non-ECC memory with 16-bit components (128 Mbit technology)
• ECC memory with 18-bit components (144 Mbit technology)
For information about Refer to
The
Rambus RIMM Specification
The
Direct Rambus Serial Presence Detect (SPD) Specification
Section 1.3, page 16
Section 1.3, page 16
12
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