Intel Desktop Board D850EMV2 User manual

Intel®Desktop Board
D850EMV2
Specification Update
Release Date: November 2003
Order Number: A96647-008
The IntelDesktop Board D850EMV2 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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Intel may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked “reserved”or “undefined”.
Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from
future changes to them.
The Inteldesktop board D850EMV2 may contain design defects or errors known as errata which may cause the product to
deviate from published specifications. Current characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications before placing your product order.
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Copyright 2002, 2003, Intel Corporation.

CONTENTS
REVISION HISTORY ...................................................................................................................................v
PREFACE ...................................................................................................................................................vi
Specification Update for the IntelDesktop Board D850EMV2
GENERAL INFORMATION ..........................................................................................................................3
SPECIFICATION CHANGES .......................................................................................................................5
ERRATA.......................................................................................................................................................8
SPECIFICATION CLARIFICATIONS............................................................................................................9

IntelDesktop Board D850EMV2 Specification Update
v
REVISION HISTORY
Date of Revision Version Description
June 2002 -001 This document is the first Specification Update for the
IntelDesktop Board D850EMV2.
August 2002 -002 Added Specification Change 1. Removed Printed Board
Assembly (PBA) information from the document, as this reference
is no longer valid.
September 2002 -003 Updated Legal Disclaimer Section.
October 2002 -004 Added Specification Change 2. Added Erratum 1.
December 2002 -005 Added Erratum 2, 3.
February 2003 -006 Added Specification Clarifications 1-4.
May 2003 -007 Added Specification Change 3.
November 2003 -008 Added Specification Clarification 5.

IntelDesktop Board D850EMV2 Specification Update
v
i
PREFACE
This document is an update to the specifications contained in the IntelDesktop Board D850EMV2 Technical
Product Specification (Order Number A94395). It is intended for hardware system manufacturers and
software developers of applications, operating systems, or tools. It will contain Specification Changes,
Errata, Specification Clarifications, and Documentation Changes.
Refer to the IntelPentium4 Processor Specification Update (Order Number 249199) for specification
updates concerning the Intel Pentium 4 processor and that may apply to the desktop board D850EMV2.
Unless otherwise noted in this document, it should be assumed that any processor errata for a given stepping
are applicable to the Altered Assembly (AA) revision(s) associated with that stepping.
Refer to the Intel82850 Chipset Family: 82850/82850E Memory Controller Hub (MCH) Specification Update
(Order Number 298247) for specification updates concerning the 82850/82850E MCH Controller and that
may apply to the desktop board D850EMV2. Unless otherwise noted in this document, it should be assumed
that any MCH errata for a given stepping are applicable to the Altered Assembly (AA) revision(s) associated
with that stepping.
Refer to the Intel82801BA I/O Controller Hub (ICH) Specification Update (Order Number 290677) for
specification updates concerning the 82801 I/O Controller Hub and that may apply to the desktop board
D850EMV2. Unless otherwise noted in this document, it should be assumed that any 82801BA I/O Controller
Hub (ICH) errata for a given stepping are applicable to the Altered Assembly (AA) revision(s) associated with
that stepping.
Nomenclature
Specification Changes are modifications to the current published specifications. These changes will be
incorporated in the next release of the specifications.
Errata are design defects or errors. Characterized errata may cause the desktop board D850EMV2’s
behavior to deviate from published specifications. Hardware and software designed to be used with any
given Altered Assembly (AA) and BIOS revision level must assume that all errata documented for that AA
and BIOS revision level are present on all desktop boards.
Specification Clarifications describe a specification in greater detail or further highlight a specification’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 omissions from the current published specifications.
These changes will be incorporated in the next release of the specifications.

Specification Update for the
Intel®Desktop Board D850EMV2

IntelDesktop Board D850EMV2 Specification Update
3
GENERAL INFORMATION
Basic Desktop Board D850EMV2 Identification Information
AA Revision BIOS Revision Notes
A87192-401 MV85010A.86A.0025.P10 1-5
A87192-500 MV85010A.86A.0025.P10 1-5
A87951-402 MV85010A.86A.0025.P10 1-5
A87951-500 MV85010A.86A.0025.P10 1-5
A87990-401 MV85010A.86A.0025.P10 1-5
A87990-500 MV85010A.86A.0025.P10 1-5
A87993-401 MV85010A.86A.0025.P10 1-5
A87993-500 MV85010A.86A.0025.P10 1-5
A88970-401 MV85010A.86A.0025.P10 1-5
A88970-500 MV85010A.86A.0025.P10 1-5
C18361-603 MV85010A.86A.0053.P19 1-5
C18361-604 MV85010A.86A.0057.P20 1-5
C18369-604 MV85010A.86A.0053.P19 1-5
C18369-605 MV85010A.86A.0057.P20 1-5
C18701-603 MV85010A.86A.0053.P19 1-5
C18701-604 MV85010A.86A.0057.P20 1-5
NOTES:
1. The AA number is found on a small label on the component side of the board.
2. The 82850 Chipset kit used on this AA revision consists of three components as follows:
Device Stepping S-Spec Numbers
82850E MCH A3 SL64X
82801BA ICH B4 SL59Z
82802AB 4Mbit FWH A1 SB48
3. Refer to the Intel Pentium4 Processor Specification Update (Order Number 249199) for errata related to the Pentium 4
processor and that may apply to the desktop board D850EMV2.
4. Refer to the Intel 82850 Chipset Family: 82850/82850E Memory Controller Hub (MCH) Specification Update (Order
Number 298247) for errata related to the 82850/82850E MCH that may apply to the desktop board D850EMV2.
5. Refer to the Intel 82801BA I/O Controller Hub Specification Update (Order Number 298242) for errata related to the
82801BA I/O Controller Hub that may apply to the desktop board D850EMV2.

IntelDesktop Board D850EMV2 Specification Update
4
Summary Table of Changes
The following table indicates the Specification Changes, Errata, Specification Clarifications, or Documentation
Changes that apply to the desktop board D850EMV2. Intel intends to fix some of the errata in a future
revision of the desktop board, and to account for the other outstanding issues through documentation or
specification changes as noted. This table uses the following notations:
CODES USED IN SUMMARY TABLE
Doc: Document change or update that will be implemented.
Fix: This erratum is intended to be fixed in a future revision of the desktop board,
driver, or BIOS.
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 version of the document.
NO. PLANS SPECIFICATION CHANGES
1 Doc Change to description of Table 14, Section 1.14.2.2, Fan Connectors
2 Doc Support for faster Pentium4 processors
3 Doc Support For Faster IntelPentium 4 Processors to Table 5 of Section 1.6 Processor
NO. PLANS ERRATA
1. Fixed Wake from an ACPI sleep state using wake methodologies may fail
2 NoFix System boot time may be excessive when using ECC memory
3. Fixed Fan control defaults incorrectly set in BIOS for onboard hardware management ASIC
NO. PLANS SPECIFICATION CLARIFICATIONS
1 Doc Addition to description of Section 1.7.1, Memory Features
2 Doc Addition to description of Section 1.7.3, Continuity RIMM Modules
3 Doc Addition to Section 1.13.1, IntelPrecision Cooling Technology for Advanced Fan Speed
Control,
4 Doc Addition to description of Section 1.10, Audio Subsystem
5 Doc Clarification of SMBus Routing

IntelDesktop Board D850EMV2 Specification Update
5
SPECIFICATION CHANGES
The Specification Changes listed in this section apply to the Desktop Board D850MV2 Technical Product
Specification (Order Number A94395). All Specification Changes will be incorporated into a future version of
that specification.
1. Change to Description of Table 14, Section 1.14.2.2, Fan
Connectors
Table 14, Section 1.14.2.2, will change in its entirety as follows:
Table 14. Fan Connector Descriptions for Boards that use the Hardware
Monitoring and Fan Control ASIC
Feature
Processor
Fan Fan 1 Fan 2 Fan 3 (Note 1)
+12 V DC connection Yes Yes Yes Yes
Tachometer output Yes Yes Yes Yes
Controllable No Yes Yes
Yes (Note 2)
Fan is on in the ACPI S0 or
S1 states
Yes Yes Yes Yes
Fan is off in the ACPI S3, S4,
and S5 states
Yes Yes Yes Yes
Notes:1. This fan is present on the desktop board D850EMV2 only.
2. Fan 3 uses the same controls as fan 2. If fan 2 is switched off, fan 3 is also off.
2. Support For Faster Pentium®4 Processors
Section 1.6, Processors will change in its entirety, as follows:
1.6 Processor
CAUTION
Use of unsupported processors can damage the board, the processor, and the
power supply. See the Intel®Desktop Board D850EMD2/D850EMV2
Specification Update for the most up-to-date list of supported processors for
these boards.

IntelDesktop Board D850EMV2 Specification Update
6
The desktop boards D850EMD2/D850EMV2 support a single Pentium®4
processor (in a µPGA478 socket) with a system bus of 400/533 MHz. Table 5
lists the supported processors.
Table 5. Supported Processors
Type Designation System Bus L2 Cache Size
Pentium®4 processor Up to 2 GHz 400 MHz 256 KB
Pentium 4 processor 1.6A, 1.7A, 1.8A, 2A,
2.20, 2.40, 2.50, and 2.60
400 MHz 512 KB
Pentium 4 processor 2.26, 2.40B, 2.53, 2.66,
2.80 GHz
533 MHz 512 KB
The list of supported processors for the desktop boards D850EMD2/D850EMV2
is available from Intel’s World Wide Web site. All supported onboard memory
can be cached. See the processor’s data sheet for cachability limits.
✏ NOTE
BIOS revision MV85010A.86A.0038.P15 or greater is required for the board to
properly support 2.50 GHz Pentium 4 or later processors.
CAUTION
Use only an ATX12V-compliant power supply with these desktop boards.
ATX12V power supplies have two power leads that provide required
supplemental power for the Intel®Pentium 4 processor and the Intel®850E
chipset. Always connect the 20-pin and 4-pin leads of the ATX12V power supply
to the corresponding connectors on the board. Otherwise, the board and the
processor could be damaged.
Do not use a standard ATX power supply. Doing so could damage the board and
the processor.
For information about Refer to
Processor support Section 1.3, page 18
Processor usage Section 1.3, page 18
Power supply connectors Section 2.8.2.3, page 60

IntelDesktop Board D850EMV2 Specification Update
7
3. Support For Faster IntelPentium4 Processors to Table 5 of
Section 1.6 Processor
Table 5 in section 1.6, Processor will change in its entirety as follows:
Table 5. Supported Processors
Processor
Family
Processor
Speed
System
Bus
L2 Cache
Size BIOS Version Notes
3.06 GHz 533 MHz 512 KB P21 or greater
The following board
revisions (AA numbers)
support these processors:
C18361-601 or later
C18369-601 or later.
Please review the new
http://developer.intel.com/
design/motherbd/
cooling.htm
2.8 GHz 533 MHz 512 KB P15 or greater
2.66 GHz 533 MHz 512 KB P15 or greater
2.6 GHz 400 MHz 512 KB P15 or greater
2.53 GHz 533 MHz 512 KB P10 or greater
2.5 GHz 400 MHz 512 KB P15 or greater
2.4B GHz 533 MHz 512 KB P10 or greater
2.4 GHz 400 MHz 512 KB P10 or greater
2.26 GHz 533 MHz 512 KB P10 or greater
2.2 GHz 400 MHz 512 KB P10 or greater
2.0A GHz 400 MHz 512 KB P10 or greater
2.0 GHz 400 MHz 256 KB P10 or greater
1.9 GHz 400 MHz 256 KB P10 or greater
1.8A GHz 400 MHz 512 KB P10 or greater
1.8 GHz 400 MHz 256 KB P10 or greater
1.7A GHz 400 MHz 512 KB P10 or greater
1.7 GHz 400 MHz 256 KB P10 or greater
1.6A GHz 400 MHz 512 KB P10 or greater
1.6 GHz 400 MHz 256 KB P10 or greater
1.5 GHz 400 MHz 256 KB P10 or greater
Pentium4
processor
1.4 GHz 400 MHz 256 KB P10 or greater
All board revisions support
these processors

IntelDesktop Board D850EMV2 Specification Update
8
ERRATA
1. Wake From an ACPI Sleep State Using Wake Methodologies May
Fail
PROBLEM:The desktop board hardware leaves the Resume Well Power OK (RSM_PWROK) signal
deasserted before and after the resume well power (VccSus3_3 and VccSus1_8) is valid, instead of asserting
it for 10 ms after valid power, which is required by the Intel®82801BA I/O Controller Hub 2 (ICH2) and Intel®
82801BAM I/O Controller Hub 2 Mobile (ICH2-M) Datasheet (order number 290687). The result is that LAN
wake attempts may fail.
NOTE: Wake from LAN* using the MagicPacket* utility will not be affected by this errata.
IMPLICATION:Users that take advantage of LAN wake methods to wake systems from an ACPI sleep state
may experience some wake failures.
WORKAROUND:None.
STATUS:This issue was fixed in BIOS revision MV85010A.86A.0038.P15.
2. System Boot Time May be Excessive When Using ECC Memory
PROBLEM:A blank screen may occur for as long as one minute during POST while the system is booting,
when ECC memory is utilized.
IMPLICATION:When BIOS detects ECC memory during the system boot process, BIOS will run memory
scans multiple times resulting in a delayed POST (up to one minute) making the system seem unresponsive.
WORKAROUND:None.
STATUS:This erratum will not be fixed.
3. Fan Control Defaults Incorrectly Set in BIOS for Onboard Hardware
Management ASIC
PROBLEM:Default BIOS settings on desktop boards that implement the IntelPrecision Cooling Technology
fan control are incorrect, which could result in improper system cooling.
IMPLICATION:The maximum front and rear system chassis fan speeds are limited to 30% of maximum,
irrespective of the actual chassis temperature. Under certain circumstances, this fan speed limitation may
not provide adequate system cooling.
NOTE: The CPU fan is not controllable by the desktop board and is not directly impacted.
WORKAROUND:Disable fan control by changing the ‘FAN CONTROL’setting to “Disabled”in the BIOS setup
menu under the ‘ADVANCED’tab, ‘FAN CONFIGURATION’menu. This will allow the system fans to run at full
speed, which will allow maximum system cooling.
STATUS:This erratum was fixed in BIOS revision MV85010A.86A.0057.P20.

IntelDesktop Board D850EMV2 Specification Update
9
SPECIFICATION CLARIFICATIONS
The Specification Clarifications listed in this section apply to the Desktop Board D850MV2 Technical Product
Specification (Order Number A94395). All Specification Clarifications will be incorporated into a future
version of that specification.
1. Addition to Description of Section 1.7.1, Memory Features
Section 1.7.1.1, Memory Features for D850EMVR will be added:
1.7.1.1 MEMORY FEATURES FOR D850EMVR
The desktop boards D850EMVR have four 2.5 V memory module sockets that
support RIMMs containing Direct Rambus* DRAM (RDRAM) devices and
support the following memory features:
• Maximum of 24 PC1066 RDRAM devices per channel (maximum 1.5 GB
PC1066 onboard capacity utilizing 256/288 Mbit technology)
• Maximum of 32 PC800 RDRAM devices per channel (maximum 2 GB
PC800 onboard capacity utilizing 128/144 Mbit or 256/288 Mbit
technology)
• Single or double-sided RIMM modules
• Support for PC1066-32P compliant RDRAM with 533 MHz front side bus
(FSB) operation
• Support for PC800-40 compliant RDRAM with 533 MHz FSB operation
• Support for PC800-40 and PC800-45 compliant RDRAM with 400 MHz
FSB operation
• Serial Presence Detect (SPD) memory only
• ECC and non-ECC support
✏ NOTE
These changes only affect desktop boards with AA numbers C18361–603,
C18369-604, C18701-603, and later.
2. Addition to Description of Section 1.7.3, Continuity RIMM*Modules
Section 1.7.3.1, RDRAM Memory Configuration for D850EMVR will be added:
1.7.3.1 RDRAM Memory Configuration for D850EMVR
When installing memory, note the following:
• Install a pair of RIMMs in the sockets in bank 0 first. The RIMMs must be the same
speed (PC1066-32P, PC800-40, or PC800-45), size (64 MB, 128 MB, 256 MB, or
512 MB), and density (single- or double-sided).

IntelDesktop Board D850EMV2 Specification Update
10
• If the desired memory configuration has been achieved in bank 0, install CRIMMs in
the sockets in bank 1.
• If memory is to be installed in bank 1, the RIMM modules to be installed must be
the same size and density to each other and match the speed of the RIMM modules
in bank 0.
✏ NOTE
If bank 0 has two 128 MB RIMMs of PC800-40 RDRAM, bank 1 would require
PC800-40 RDRAM also. However, any other supported RIMM modules such as
64 MB, 128 MB, 256 MB, or 512 MB could be used.
✏ NOTE
These changes only affect desktop boards with AA numbers C18361-603,
C18369-604, C18701-603, and later.
3. Addition to Section 1.13.1, Intel®Precision Cooling Technology For
Advanced Fan Speed Control
Section 1.13.1.4, IntelPrecision Cooling Technology for Advanced Fan Speed Control will be added:
1.13.1.4 Intel Precision Cooling Technology for Advanced Fan
Speed Control
Intel Precision Cooling Technology automatically adjusts the chassis fan
speeds depending on the system’s temperature. This feature reduces system fan
noise by lowering the speed of the chassis fans connected to the front, rear, and
RIMM chassis fan connectors. This feature does not control the processor fan
connector.
The fan speed control feature can be disabled in the BIOS, resulting in the
chassis fans always operating at full speed. This feature should be disabled if a
self-controlled fan is attached to a chassis fan connector.
Overall system noise reduction will vary based on system configuration and
environment.
The features of the hardware monitoring and fan control ASIC (Analog
Devices ADM1027, National Semiconductor LM85, Standard Microsystems
SMSC EMC6D101, or equivalent) include:
• Internal ambient temperature sensor
• Two remote thermal diode sensors for direct monitoring of processor
temperature and ambient temperature sensing

IntelDesktop Board D850EMV2 Specification Update
11
• Power supply monitoring of five voltages (+5 V, +12 V, +3.3 V, +1.5 V,
and +VCCP1) to detect levels above or below acceptable values
• Fan monitoring for all fans (four fans on the Desktop Board D50EMVR)
• Thermally monitored closed-loop fan control, for all three fans, that can
adjust the fan speed or switch the fans on or off as needed
• SMBus interface
For information about Refer to
The location of the fan connectors and sensors for
thermal monitoring
Figure 14, page 60
The Analog Devices ADM1027 http://www.analogdevices.com
The National Semiconductor LM85 http://www.national.com
The Standard Microsystems SMSC EMC6D101 http://www.smsc.com
✏ NOTE
These changes only affect desktop boards with AA numbers C18361-603,
C18369-604, C18701-603, and later.
4. Addition to Description of Section 1.10, Audio Subsystem
Section 1.10.1, Audio Subsystem for D850EMVR will be added:
1.10.1 Audio Subsystem for D850EMVR
The audio subsystem consists of the following devices:
• Intel82801BA ICH2
• Analog Devices AD1881b analog codec
The audio subsystem includes these features:
• Split digital/analog architecture for improved signal-to-noise (S/N) ratio:
≥85 dB
• Power management support for ACPI 1.0 (driver dependant)
• 3-D stereo enhancement
The audio subsystem supports the following audio interfaces:
• ATAPI-style connectors:
o CD-ROM
o Auxiliary line in

IntelDesktop Board D850EMV2 Specification Update
12
• Front panel audio connector, including pins for:
o Line out
o Mic in
• Back panel audio connectors:
o Line out
o Line in
o Mic in
o 1/8”stereo microphone back panel jack
Figure 8 is a block diagram of the audio subsystem.
82801BA
I/O Controller Hub
(ICH2)
OM12338
AC ’97
Link AD1881b
Audio Codec Auxiliary Line In
Mic In
Line Out
CD-ROM
Line In
Figure 8. Audio Subsystem Block Diagram
For information about Refer to
The location and signal names of the back panel audio
connectors
Section 2.8.1, page 54
✏ NOTE
These changes only affect desktop boards with AA numbers C18361–603,
C18369-604, C18701-603, and later.

IntelDesktop Board D850EMV2 Specification Update
13
5. Clarification of SMBus Routing
Section 2.8.2.1 will change in its entirety as follows:
2.8.2.1 Expansion Slots
The board has the following expansion slots:
• One AGP connector. The AGP connector is keyed for 1.5 V AGP cards only.
Do not install a legacy 3.3 V AGP card. The AGP connector is not
mechanically compatible with legacy 3.3 V AGP cards.
• PCI 2.2–compliant local bus slots (three on the desktop board D850EMD2;
five on the desktop board D850EMV2). The SMBus is routed to PCI bus
connector 2 only (ATX expansion slot 4).PCI add-in cards with SMBus
support can access sensor data and other information residing on the board.
• One CNR connector (optional), shared with PCI bus connector 3 (ATX
expansion slot 1) on the desktop board D850EMD2 or with PCI bus
connector 6 (ATX expansion slot 1) on the desktop board D850EMV2.
✏ NOTE
The SMBus routing to the PCI bus connectors does not conform to the PCI
Engineering Change Notice (ECN) “Addition of the SMBus to the PCI Connector
ECN”, dated October 5th, 2000. The ECN specifies that SMBus signals must be
routed to all PCI bus connectors. On this board, SMBus signals are routed to
PCI bus connector 2 only.
Add-in cards that implement PCI bus connector pins A40 and A41 for any
purpose other than SMBCLK (SMBus clock) and SMBDAT (SMBus data) should
not be installed in PCI bus connector 2.
For information about Refer to
Addition of the SMBus to the PCI Connector ECN http://www.pcisig.com/data/s
pecifications/smb_ecn_0405
01.pdf
✏ NOTE
This document references back panel slot numbering with respect to processor
location on the board. The AGP slot is not numbered. PCI slots are identified as
PCI slot #x, starting with the slot closest to the processor. The CNR slot shares
PCI slot 6. The ATX/microATX specifications identify expansion slot locations

IntelDesktop Board D850EMV2 Specification Update
14
with respect to the far edge of a full-sized ATX chassis. The ATX specification
and the board’s silkscreen are opposite and could cause confusion. The ATX
numbering convention is made without respect to slot type (PCI vs. AGP) but
refers to an actual slot location on a chassis. Figure 15 on page 63 illustrates the
desktop board D850EMD2’s PCI slot numbering. Figure 16 on page 64
illustrates the desktop board D850EMV2’s PCI slot numbering.