RadiSys BG845G User manual

BG845G Product Manual
www.radisys.com
97-7866-02 • August 2004

BG845G Product Manual
2
August 2004
Copyright ©August 2004 by RadiSys Technology (Ireland) Ltd.
All rights reserved.
EPC and RadiSys are registered trademarks of RadiSys Corporation. ASM, Brahma, DAI, DAQ, MultiPro, SAIB, Spirit,
and ValuePro are trademarks of RadiSys Corporation.
DAVID, MAUI, OS-9, OS-9000, and SoftStax are registered trademarks of RadiSys Microware Communications
Software Division, Inc. FasTrak, Hawk, and UpLink are trademarks of RadiSys Microware Communications Software
Division, Inc.
†All other trademarks, registered trademarks, service marks, and trade names are the property of their respective
owners.

Preface
3
Preface
Revision History
All revisions that start with zero (i.e., 0.5, 0.65, etc.) are preliminary drafts for internal reviews.
Table 1. Revision history
No. Date Description
1.0 March 2003 First release
1.1 September 2003 •Updated environmental specifications for shock and vibration
and added MTBF data. Re-ordered Specifications sub-
sections to improve pagination.
•Removed duplicate keyboard and mouse headers entry and
corrected references to 2.5mm jacks (to 3.5mm) in
Connectors table, section C.1.
•Corrected total power shown in text to match the table.
Section 3.8.4. Also changed fan current to 1.7A to cover CPU
and two system fans.
•Added CPU fan drive capability at 800mA, miscellaneous
specification section.
•Section 2.10. Added USB boot capability at 1.1 speeds.
•Changed maximum current load on GPIO ports footnote.
•Corrected dual audio stacked connector part number and
added internal USB header to connectors table.
1.2 •Applied new RadiSys document format
•Correct Normal and Recover jumper description
•Updated memory module support – 845G supports PC1600 &
PC2100, 845GV supports PC2100 and PC2700
•Add wake-from-S5 support and remove LAN wake-up for
10/100 82551ER-based Ethernet products
•Add ACPI SCI interrupt to ISA interrupt allocation table
•Corrected description of P4M bit of processor identification
register, section B.9
•Added system management controller to SMBus resource
allocation table
•Added note that GPIO control bit D104 does not support
read-back with controller versions up to and including 2
•Removed support for TPM security
•Corrected dimensioning of GMCH on mechanical drawing

BG845G Product Manual
4
Notational Conventions
This manual uses the following conventions:
•Screen text and syntax strings appear in this font.
•All numbers are decimal unless otherwise stated.
Notes indicate important information
about the product.
Tips indicate alternate techniques or
procedures that you can use to save
time or better understand the product.
Cautions indicate potentially hazardous
situations which, if not avoided, may result
in minor or moderate injury, or damage to
data or hardware. It may also alert you
about unsafe practices.
The globe indicates a World Wide
Web address.
Warnings indicate potentially hazardous
situations which, if not avoided, can result
in death or serious injury.
The book indicates a book or file.
ESD cautions indicate situations that
may cause damage to hardware via
electro-static discharge (ESD).
Danger indicates imminently hazardous
situations which, if not avoided, will result
in death or serious injury.
Installation Notes
When installing this motherboard into a suitable chassis, refer to the following notes:
•Read and save all instructions.
•Always disconnect Cord/Plug before installation or upgrade. Parts of the motherboard can
remain powered even when the power supply is switched off unless the cord is disconnected.
•Pay attention to the safety warnings included in this document.
•When installing expansion cards, pay attention to the maximum loads detailed in this
document. Use only UL approved peripheral cards.
•Route wiring away from sharp edges, heat sources and cooling fans.
•Pay attention to the thermal issues described in this document. The motherboard requires
suitable airflow to maintain an ambient temperature within its operating range.

Safety and Approval Notices
5
Safety and Approval Notices
Table 2. Safety and approval notices
Item Description
Battery This product contains a lithium cell.
•When removing or replacing the lithium cell, do not use a
conductive instrument as a short-circuit may cause the cell
to explode. Always replace the cell with one of the same
type. This product uses a CR2032 cell. Dispose of a spent
cell promptly – do not recharge, disassemble or incinerate.
Keep cells away from children.
•CAUTION! Danger of explosion if battery is incorrectly
replaced. Replace only with the same or equivalent type
recommended by the manufacturer. Dispose of batteries
according to the manufacturer's instructions.
LAN (Local Area
Network) Connector This product may include an RJ45 LAN connector (see
product options). Do not connect to anything other than an
Ethernet LAN.
Thermal Interface
Material This product may contain thermal interface material between
devices and heatsinks. This can cause irritation and can stain
clothing. Avoid prolonged or repeated contact with the skin
and wash thoroughly with soap and water after handling. Avoid
contact with eyes and inhalation of fumes. Do not ingest.
Anti-static
Precautions This product contains static-sensitive components and should
be handled with care. It is recommended that the product be
handled in a Special Handling Area (SHA) as defined in
EN100015-1:1992. Such an area has working surfaces, floor
coverings and chairs connected to a common earth reference
point. An earthed wrist strap should be worn whilst handling.
Other examples of static-sensitive devices are the memory
modules and the processor. Failure to employ adequate anti-
static measures can cause irreparable damage to components
on the motherboard.
Electromagnetic
Compatibility This product is designed to meet the following EMC standards
when installed in a suitable chassis.
•FCC Class B (Title 47 of Code of Federal Regulations, parts
2 & 15, subpart B)
•EN55022:1998 Class B
•EN55024:1998
Safety This product complies with the American Safety Standard
UL60950 when installed in a suitable chassis.
Legal Directives This product complies with the relevant clauses of the
following European Directives.
Low Voltage Directive 73/23/EEC
EMC Directive 89/336/EEC

BG845G Product Manual
6
Contents
1. OVERVIEW...........................................................................................................................11
1.1 Motherboard Layout..................................................................................................................... 13
1.2 Block Diagram ............................................................................................................................. 15
1.3 Product Options............................................................................................................................ 16
1.4 Configuration ............................................................................................................................... 17
1.4.1 Operation Mode Selection............................................................................................ 17
1.4.2 Riser Control ................................................................................................................ 18
1.4.3 Processor Type Selection ............................................................................................. 18
1.4.4 BIOS Write Protection ................................................................................................. 18
1.4.5 Front Panel Connections............................................................................................... 18
1.4.6 Alternate Power LED ................................................................................................... 19
2. MOTHERBOARD DESCRIPTION....................................................................................20
2.1 Processor ...................................................................................................................................... 20
2.2 System Memory ........................................................................................................................... 20
2.3 Chipset ......................................................................................................................................... 21
2.4 Video............................................................................................................................................ 21
2.4.1 System Memory Allocation.......................................................................................... 21
2.4.2 Video Modes ................................................................................................................22
2.5 IDE Drives ................................................................................................................................... 22
2.6 Diskette Drives............................................................................................................................. 22
2.7 Audio............................................................................................................................................ 22
2.8 Network........................................................................................................................................ 23
2.9 Standard PC I/O ........................................................................................................................... 23
2.9.1 Serial Ports ................................................................................................................... 23
2.9.2 Parallel Port.................................................................................................................. 23
2.9.3 Keyboard and Mouse Ports........................................................................................... 24
2.10 USB Ports..................................................................................................................................... 24
2.11 General Purpose I/O Lines ........................................................................................................... 24
2.12 CMOS RAM & RTC.................................................................................................................... 24
2.13 Expansion Cards........................................................................................................................... 25
2.14 System management..................................................................................................................... 25
2.14.1 Voltage Monitoring ...................................................................................................... 26
2.14.2 Temperature Monitoring .............................................................................................. 27
2.14.3 Fan Monitoring............................................................................................................. 27
2.14.4 Fan Control................................................................................................................... 28
2.14.5 Tamper Detection ......................................................................................................... 28
2.15 Power management ...................................................................................................................... 28
2.15.1 ACPI Power States ....................................................................................................... 28
2.15.2 ACPI Wake-up Support................................................................................................ 29
2.16 Indicators...................................................................................................................................... 29
2.16.1 Power State Indicators.................................................................................................. 29
2.16.2 Network Status Indicators ............................................................................................ 30
2.16.3 I/O Panel Indicators......................................................................................................30
2.17 BIOS ............................................................................................................................................ 30
2.18 Operating Systems Support .......................................................................................................... 31

Contents
7
3. SPECIFICATIONS ...............................................................................................................32
3.1 Environmental.............................................................................................................................. 32
3.2 Thermal ........................................................................................................................................ 32
3.3 Regulatory EMC Compliance ...................................................................................................... 33
3.4 Regulatory Safety Compliance..................................................................................................... 33
3.5 Industry Compliance .................................................................................................................... 33
3.6 Miscellaneous............................................................................................................................... 34
3.7 Mechanical................................................................................................................................... 34
3.7.1 Motherboard ................................................................................................................. 34
3.7.2 I/O Shield ..................................................................................................................... 36
3.7.3 Fansink ......................................................................................................................... 36
3.8 Electrical ...................................................................................................................................... 37
3.8.1 Motherboard Power Consumption................................................................................ 37
3.8.2 Power Delivery to Expansion Slots .............................................................................. 38
3.8.3 Power Supply Selection................................................................................................ 38
3.8.4 Power Budget ...............................................................................................................39
3.8.5 General Purpose I/O Lines ........................................................................................... 40
4. MOTHERBOARD BIOS ......................................................................................................41
4.1 Configuration ............................................................................................................................... 41
4.2 Update and Recovery ................................................................................................................... 41
4.2.1 Creating a BIOS Update Diskette................................................................................. 42
4.2.2 Updating the System BIOS........................................................................................... 42
4.2.3 Creating a BIOS Recovery Diskette ............................................................................. 43
4.2.4 Recovering the System BIOS ....................................................................................... 43
4.2.5 Updating the Flash Bootblock ...................................................................................... 43
4.3 Customization .............................................................................................................................. 44
4.4 BIOS Error Indications................................................................................................................. 45
5. CUSTOMER SUPPORT.......................................................................................................49
A TECHNICAL REFERENCE................................................................................................50
A.1 I/O Map........................................................................................................................................ 50
A.2 PCI Interrupt Allocation............................................................................................................... 51
A.3 PCI Device Assignments.............................................................................................................. 52
A.4 SMBus Resource Allocation ........................................................................................................ 52
A.5 ISA Interrupt Allocation............................................................................................................... 53
A.6 ISA DMA Channel Allocation ..................................................................................................... 53
A.7 BIOS Organization....................................................................................................................... 54
B CONTROL REGISTERS .....................................................................................................55
B.1 Index Register .............................................................................................................................. 55
B.2 Watchdog Control ........................................................................................................................ 55
B.3 Watchdog Kick............................................................................................................................. 56
B.4 Watchdog Status........................................................................................................................... 56
B.5 Watchdog Timeout Period............................................................................................................ 57
B.6 General Purpose I/O Port 1 .......................................................................................................... 57
B.7 General Purpose I/O Port 2 and Control.......................................................................................57
B.8 PWM Control............................................................................................................................... 58
B.9 Processor Identification................................................................................................................ 58

BG845G Product Manual
8
B.10 Controller Part Number................................................................................................................ 59
C CONNECTOR DESCRIPTIONS.........................................................................................60
C.1 Connector Part Numbers .............................................................................................................. 60
C.2 AGP Expansion Slot (AGP card mode, where applicable)........................................................... 62
C.3 AGP Expansion Slot (ADD card mode)....................................................................................... 63
C.4 PCI Expansion Slot ...................................................................................................................... 64

Contents
9
Figures
Figure 1. Motherboard layout ................................................................................................................. 13
Figure 2. Block diagram ......................................................................................................................... 15
Figure 3. Jumpers.................................................................................................................................... 17
Figure 4. Dimensions and rear-panel connectors .................................................................................... 35
Figure 5. I/O shield................................................................................................................................. 36
Figure 6. Fansink .................................................................................................................................... 36
Figure 7. BIOS ROM addresses.............................................................................................................. 54
Tables
Table 1. Revision history ............................................................................................................................. 3
Table 2. Safety and approval notices............................................................................................................ 5
Table 3. Features ........................................................................................................................................ 11
Table 4. Component Identification............................................................................................................. 14
Table 5. Product options............................................................................................................................. 16
Table 6. Supported processors.................................................................................................................... 20
Table 7. Supported video modes ................................................................................................................ 22
Table 8. RJ45 LEDs ................................................................................................................................... 23
Table 9. Slot resource allocation ................................................................................................................ 25
Table 10. Voltage rails ............................................................................................................................ 26
Table 11. Supported voltages .................................................................................................................. 26
Table 12. Fan monitors............................................................................................................................ 27
Table 13. ACPI power states ................................................................................................................... 28
Table 14. ACPI wake-up support ............................................................................................................ 29
Table 15. Power state indicators.............................................................................................................. 29
Table 16. Network status indicators ........................................................................................................ 30
Table 17. I/O panel indicators ................................................................................................................. 30
Table 18. Environmental specifications................................................................................................... 32
Table 19. Industry specifications............................................................................................................. 33
Table 20. Miscellaneous specifications ................................................................................................... 34
Table 21. Configuration for power requirements .................................................................................... 37
Table 22. Intel Pentium 4 at 2.8GHz with 533MHz processor bus.......................................................... 37
Table 23. Intel Pentium 4-M at 1.7GHz with 400MHz processor bus..................................................... 37
Table 24. Maximum Expansion Slot Current .......................................................................................... 38
Table 25. Power supply selection ............................................................................................................ 38
Table 26. Power budget........................................................................................................................... 39
Table 27. General purpose I/O lines ........................................................................................................ 40
Table 28. BIOS menus ............................................................................................................................ 41
Table 29. Beep codes............................................................................................................................... 43
Table 30. BIOS POST checkpoint codes................................................................................................. 45
Table 31. BIOS POST checkpoint codes with beep ................................................................................ 47
Table 32. References ............................................................................................................................... 49
Table 33. I/O map.................................................................................................................................... 50
Table 34. PCI interrupt allocation ........................................................................................................... 51
Table 35. PCI device assignments........................................................................................................... 52
Table 36. SMBus resource allocation...................................................................................................... 52

BG845G Product Manual
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Table 37. ISA interrupt allocation ........................................................................................................... 53
Table 38. ISA DMA channel allocation .................................................................................................. 53
Table 39. Connector part numbers........................................................................................................... 60
Table 40. AGP/ADD slot ........................................................................................................................ 62
Table 41. AGP/ADD expansion slot ....................................................................................................... 63
Table 42. PCI expansion slot................................................................................................................... 64
Table 43. PCI Slot 2 Riser Extension ...................................................................................................... 65
Table 44. PCI Slot 3 Riser Support ......................................................................................................... 66
Table 45. PCI Slot 4 Riser Support ......................................................................................................... 66
Table 46. ATX 12V Power Supply ......................................................................................................... 66
Table 47. ATX Power Supply ................................................................................................................. 66
Table 48. Front Panel Header.................................................................................................................. 67
Table 49. VGA Monitor .......................................................................................................................... 67
Table 50. Parallel Port ............................................................................................................................. 68
Table 51. Serial Port 1............................................................................................................................. 68
Table 52. Serial Port 2............................................................................................................................. 68
Table 53. Ethernet LED Header .............................................................................................................. 69
Table 54. RJ45 Ethernet (10/100)............................................................................................................ 69
Table 55. RJ45 Ethernet (Gbit)................................................................................................................ 69
Table 56. USB I/O Panel Ports................................................................................................................ 69
Table 57. USB Internal Ports................................................................................................................... 69
Table 58. IDE Drive Headers .................................................................................................................. 70
Table 59. Diskette Drive Header ............................................................................................................. 71
Table 60. GPIO Header ........................................................................................................................... 71
Table 61. PS/2 Keyboard......................................................................................................................... 72
Table 62. PS/2 Mouse ............................................................................................................................. 72
Table 63. Keyboard Header..................................................................................................................... 72
Table 64. Mouse Header.......................................................................................................................... 72
Table 65. Internal Audio Headers............................................................................................................ 72
Table 66. Line In and Out Jacks .............................................................................................................. 72
Table 67. MIC Jack ................................................................................................................................. 73
Table 68. Processor and System Fan 1 & 2 ............................................................................................. 73
Table 69. Remote Thermal Sensor .......................................................................................................... 73
Table 70. SMBus Header ........................................................................................................................ 73
Table 71. Alternate Power LED .............................................................................................................. 73

1. Overview
11
1. Overview
The BG845G is a microATX form factor motherboard based around an Intel Celeron or Pentium 4
processor and an Intel 845G family chipset. It integrates video, audio, system monitoring and two
Ethernet controllers on a 9.6 x 9.6-inch board.
Table 3. Features
Item Description
Form Factor MicroATX, 9.6 x 9.6 inches.
Processor 478-pin PGA socket for Intel Celeron, Pentium 4 and Pentium 4-M
processors with a 400 or 533MHz processor bus speed in FC-PGA2 or
µFC-PGA packages.
Chipset Intel 845G-family GMCH with Intel ICH4 I/O hub.
Memory Two 184-pin DIMM sockets for DDR modules without ECC or parity.
845G-based products support PC1600 and PC2100
845GV-based products support PC2100 and PC2700
Maximum 2GB, minimum 32MB memory.
Video Intel® Extreme Graphics 3D controller integrated within chipset with
support for digital display or TV-Out via ADD card.
Audio Digital audio controller integrated within chipset with AC97 CODEC.
MIC, Line output and Line input (optional) jacks on I/O panel.
CD input, AUX input and Line output ATAPI internal connectors.
On-board PC speaker.
Expansion Three PCI 2.2 slots, each with support for a 3-slot riser.
One AGP slot for 1.5V AGP 4X cards (build dependent) or ADD cards.
Power Management APM, ACPI, PCI PME.
System Management System voltage and temperature monitoring.
Monitoring for 3 fans including processor fan.
Fan speed control with automatic option based on thermal monitors.
Lithium cell voltage monitoring.
Programmable watchdog timer.
Status LED stack on I/O panel (4 LEDs).
SMBus header.
BIOS Phoenix ServerBIOS™ 3.0-based including video BIOS and network
boot (dependent on network controllers).
4 or 8Mbit device with optional socket.
Customizable including system configuration and startup logo.
I/O Six USB 2.0 ports - four on rear panel, two on locking headers.
Two RS232 serial ports – one on rear panel, one on header.
Bi-directional/EPP/ECP parallel port on rear panel.
PS/2 keyboard and mouse on rear panel (and via internal headers).
General Purpose I/O lines (13) with LCD character display support.

BG845G Product Manual
12
Table 3. Features
Item Description
Network Two Intel-based 10/100Mbps or Gbit Ethernet channels.
Disks Two Ultra ATA/100 interfaces with ATAPI CD, LS120 and ZIP drive
support.
3-mode floppy interface with on-board connector.

1. Overview
13
1.1 Motherboard Layout
The next figure shows the layout of the BG845G motherboard with the major components
identified.
Figure 1. Motherboard layout
1
5
7
4
3
6
8
9
10
11
12
60 57 54 59 58 535556 51 4752 4950 48 46
43
45
42
40
39
41
38
29
28
37
36
35
34
33
44
16 17 25 26 2724
22
19
151413
2
20 21 23
18
31
32
30

BG845G Product Manual
14
Table 4. Component Identification
Description Description Description
1 Serial port 2 header 21 USB 2.0 channel 2 41 PCI bus arbiter
2 Memory sockets 22 USB 2.0 channel 3 42 Operating mode and
riser enable jumpers
3
Chipset GMCH heatsink
clip 2
3
Ethernet port 2 (RJ45) 4
3
Front panel connector
4 Chipset GMCH heatsink 24 Audio Microphone input
jack
44 SMBus header
5
478-pin socket for
processor
2
5
Diagnostic LED stack 4
5
Alternate Power LED
header
6
ITP debug port
(prototypes only) 2
6
Audio Line output jack 4
6
Miniature speaker
7 Clock generator 27 Audio Line input jack 47 I/O controller hub (ICH4)
8
Remote thermal sensor 2
8
Audio CD-ROM Line
input header
4
8
System fan 2 power
connector
9
12V power connector
from PSU 2
9
Audio AUX Line input
header 4
9
System fan 1 power
connector
1
0
Processor fan power
connector
30
AC97 audio CODEC
50
3V Lithium cell – use
CR2032
11 Mouse header
3
1Audio Line output header
5
1BIOS ROM (FWH)
12 Keyboard header
3
2Ethernet controller 2
5
2Secondary IDE
connector
1
3
PS/2 mouse (green)
33
Ethernet controller 1
53
Control logic
14 PS/2 keyboard (purple)
3
4Slot 1 - 1.5V AGP or
ADD
5
4Primary IDE connector
1
5
Serial port 1
35
Slot 2 - PCI 2.2 with ATX
riser extension
55
Processor type selection
jumper
1
6
Parallel port
36
Slot 3 - PCI 2.2
56
BIOS ROM write-protect
jumper
17 VGA monitor
3
7Slot 4 - PCI 2.2
5
7GPIO header
1
8
USB 2.0 channel 0
38
Ethernet ports LED
header
58
Primary power supply
connector
1
9
USB 2.0 channel 1
39
USB 2.0 channel 5
header
59
Super I/O controller
2
0
Ethernet port 1 (RJ45) 4
0
USB 2.0 channel 4
header
60
Diskette header

1. Overview
15
1.2 Block Diagram
The next figure shows a block diagram of the BG845G motherboard.
Figure 2. Block diagram
Intel Processor
Celeron, Pentium 4,
Pentium 4-M
478-pin
Graphics & Memory
Controller
(GMCH)
I/O Controller Hub
(ICH4)
DIMM 0
Slots 2 to 4, PCI 2.2
Slot 1, AGP 1.5V
or ADD
DIMM 1
Clocks
Watchdog,
GPIO,
Control
TPM
Firmware Hub
(FWH)
System
Management
(LM85)
Super I/O
(PC87373)
VGA
Connector
Diagnostic LEDs
VRM
USB0 Connector
SMBus Connector
Remote Thermal
Sensor
RJ45 LAN 2
RJ45 LAN 1
PCI Bus
Arbiter
Ethernet LED
Header
Lithium cell
Riser Support
Intel MAC/PHY
82551 10/100
82540 Gbit
Serial Port 1
Connector
Primary IDE
Connector
Secondary IDE
Connector
Diskette Drive
Connector
Serial Port 2
Header
USB4
Header
USB5
Header
CD-ROM
Line input Header
Miniature
Speaker
AUX
Line Input Header
Line-Out Header
Line-In Jack
Microphone
Input Jack
Line-Out Jack
Parallel Port
Connector
PS/2 Keyboard
Connector
Header
Header
PS/2 Mouse
Connector
Internal Digital I/O
Header
USB1 Connector
USB2 Connector
USB3 Connector
Hub Link 1.5
(266MBps)
DDR SDRAM Bus
(100/133/166MHz)
ATA 66/100
1.5V AGP or
DVO Ports B & C
PC1600-PC2700
PC1600-PC2700
PCI Bus
(32-bit, 33 MHz)
LPC Bus
(33 MHz)
6 USB 1.1/2.0 Channels (480Mbps max.)
Fan Control
Voltage Monitoring
Fan Monitoring
IntelMAC/PHY
82551 10/100
82540 Gbit
AC97
Audio CODEC
(AD1885)
Amp

BG845G Product Manual
16
1.3 Product Options
The next table lists the product options available.
Table 5. Product options
Functions BG845G-L BG845GV-L BG845GV-2L BG845GV-2G
Chipset Intel 845G Intel 845GV Intel 845GV Intel 845GV
LAN Single 10/100
(82551ER)
Single 10/100
(82551ER)
Dual 10/100
(82551ER)
Dual Gigabit
(82540EM)
LAN Remote boot No No No No
LAN wake-up No No No Yes
Audio Yes, 3 jacks Yes, 3 jacks Yes, 2 jacks Yes, 2 jacks
AGP Yes No No No
ADD Yes Yes Yes Yes
Watchdog Yes Yes Yes Yes
Riser support Yes Yes Yes Yes
Headless No No No No
Socketed BIOS ROM No No No No
Each product is available with a choice of CPU speed. Consult the latest price list for the available
options. Other product options are available to special order for high volume customers.

1. Overview
17
1.4 Configuration
The majority of the configuration of the motherboard is done through the Setup utility built into
the BIOS – discussed later in this document. There are, however, a number of jumpers that control
the operation of the motherboard as described below. Some jumpers are not fitted to certain
products.
Figure 3. Jumpers
Riser
Control
Operating
Mode
Riser Control Jumper
Riser Disabled
Riser Enabled
Operating Mode Jumper
Normal
Configure
Recover
Processor Type Select
Mobile Desktop Auto
BIOS Write Protect
Write Enabled Write Disabled
1.4.1 Operation Mode Selection
This jumper selects one of these operating modes for the motherboard:
Normal Mode (Factory default) This is the position the jumper should be in for normal
operation of the motherboard.
Recovery Mode If the jumper is in the recovery mode position then recovery mode is entered.
The motherboard does not boot and waits until a valid recovery diskette is
detected and then copies a new BIOS into the ROM. The motherboard must be
powered down and then re-powered with the jumper in the normal position
before normal operation can resume.
ConfigureMode With the jumper in this position the motherboard automatically runs the BIOS
Setup utility regardless of the state of the Setup disable flag that can be set in the
BIOS defaults. In this mode, the CMOS RAM contents are ignored and the
manufacturer (F9) defaults are used to configure the motherboard.

BG845G Product Manual
18
1.4.2 Riser Control
Install this jumper in the Enabled position to enable the additional riser support signals to route to
the normally unused pins of the slot 3 and 4 PCI connectors. Install the jumper in the Disabled
position when fitting a PCI card directly into slot 3 or 4. This jumper does not affect risers in slot
2.
CAUTION
Ensure the jumper is in the Disabled position when a PCI adapter card is fitted directly into
slots 3 or 4.
1.4.3 Processor Type Selection
This jumper identifies the type of processor fitted to the motherboard to enable the correct
processor voltage to be generated. Normally, the jumper should be in the Auto position in which
case the motherboard selects the appropriate voltage according to the processor voltage request.
Auto Enables the motherboard to automatically determine the correct processor
voltage. Fitting the jumper in one of the two positions described below forces
the motherboard to assume the processor is of the selected type.
Desktop Forces the motherboard to assume that the processor is a desktop processor and
disable the voltage translation logic.
Mobile Forces the motherboard to assume that the processor is a mobile processor and
to always turn-on the voltage translation logic.
CAUTION
When fitting a processor type jumper (Desktop or Mobile selections) always ensure that the
processor fitted matches the type specified by the jumper. Processor damage can result if this
jumper is fitted incorrectly.
1.4.4 BIOS Write Protection
Some motherboard configurations include a BIOS write protection jumper facility. In this case, the
BIOS ROM contents cannot be updated or changed in any way (including CMOS Save/Restore
and ESCD) unless the jumpers are fitted. Motherboards without this option have the write
protection controlled by software alone.
1.4.5 Front Panel Connections
The primary controls and indicators for the motherboard are connected via the front panel
connector using either a single ribbon cable to a ‘front panel’ assembly, or using a number of
small PC-standard connectors. The functions are described below. See appendix B for the
connector pin-out information.
Power LED
Connects either a single-color LED (usually green) or a two-terminal bi-color LED (usually
green/yellow) to indicate the powered status of the motherboard. In both cases, the ‘green’ anode
should be attached to pin 2 of the front panel connector. See the Indicators section later in this
document for further information.

1. Overview
19
Power Switch
If the motherboard is used with a soft-switch power supply, a momentary switch should be
connected between pins 6 and 8 of the power connector.. If the switch is closed for greater than
approximately 4 seconds, the motherboard powers off immediately, regardless of the state of the
operating system, losing any system context information. This input is redundant when using a
hard-switch power supply.
Reset Switch
If used, a momentary switch connected between pins 5 and 7 will cause the motherboard to restart
when closed.
Hard Disk LED
To indicate hard disk activity on either of the two ATA channels, a single color LED should be
connected between pins 1 (anode) and 3.
Speaker
Connect an external speaker between pins 10 and 11 or 10 and 16. This is used only for the PC
‘beep’ functions. The speaker should typically be 8Ω.
Tamper Switch
To make use of the tamper detection logic of the motherboard, connect a momentary switch
between pins 18 and 20. The switch should be open when the chassis is closed.
1.4.6 Alternate Power LED
The power LED function on the front panel connector is duplicated on the Alternate Power LED
connector for use with LEDs cabled to a 3-pin connector. Do not use both the primary (front
panel) and alternate connectors simultaneously.

BG845G Product Manual
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2. Motherboard Description
2.1 Processor
The BG845G motherboard supports Intel Celeron, Pentium 4 and Pentium 4-M processors in a
478-pin PGA package (FC-PGA2 or µFC-PGA) and built with a 0.13 micron process. The next
table lists the supported processors. An on-board voltage regulator generates the voltage for the
CPU. Both the processor voltage and the operating frequency are automatically adjusted by the
motherboard to suit the installed processor.
Table 6. Supported processors
Processor Type Processor Speed CPU bus speed Cache size Package
Intel Celeron 2.00 GHz 400 MHz 128kB FC-PGA2
Intel Pentium 4 2.00 GHz 400 MHz 512kB FC-PGA2
Intel Pentium 4 2.40 GHz 533 MHz 512kB FC-PGA2
Intel Pentium 4 2.60 GHz 400 MHz 512kB FC-PGA2
Intel Pentium 4 2.80 GHz 533 MHz 512kB FC-PGA2
Intel Pentium 4-M 1.70 GHz 400 MHz 512kB µFC-PGA
Intel Pentium 4-M 2.20 GHz 400 MHz 512kB µFC-PGA
2.2 System Memory
The BG845G motherboard has two DIMM sockets to accept 64-bit DDR memory modules. The
sockets may be populated in any order and each can accept either single or double-sided modules.
The minimum total memory size is 32MB and the maximum is 2GB. The BIOS automatically
configures the motherboard for the correct size, speed and type. See the Manuals, Drivers & BIOS
section on the RadiSys web site at www.radisys.com for a list of memory modules that were tested
with this product.
Note
When using the on-board video controller, the frame buffer is held within system memory and
thus less memory is available to the operating system.
•Compliance with the JEDEC DDR specification for 2.5V 184-pin unbuffered DDR SDRAM
•Speed of either PC1600 (DDR200) or PC2100 (DDR266) for 845G-based products
•Speed of either PC2100 (DDR266) or PC2700 (DDR333) for 845GV-based products
•Inclusion of a valid serial presence detect (SPD) ROM
•Based on 64Mb, 128Mb, 256Mb or 512Mb devices
•Capacity of between 32MB and 1GB
•64 bits wide. ECC or parity is not supported