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RadiSys BG845G Product Manual

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BG845G Product Manual
w w w . r a d i s y s . c o m
97-7866-02 • August 2004

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Summary of Contents for RadiSys BG845G

  • Page 1 BG845G Product Manual w w w . r a d i s y s . c o m 97-7866-02 • August 2004...
  • Page 2 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.

  • Page 3: Table 1. Revision History

    • Changed maximum current load on GPIO ports footnote. • Corrected dual audio stacked connector part number and added internal USB header to connectors table. • Applied new RadiSys document format • Correct Normal and Recover jumper description • Updated memory module support – 845G supports PC1600 &...
  • Page 4 BG845G Product Manual 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 Cautions indicate potentially hazardous about the product.

  • Page 5: Table 2. Safety And Approval Notices

    Safety and Approval Notices Safety and Approval Notices Table 2. Safety and approval notices Item Description This product contains a lithium cell. Battery • When removing or replacing the lithium cell, do not use a conductive instrument as a short-circuit may cause the cell to explode.

  • Page 6: Table Of Contents

    BG845G Product Manual Contents 1. OVERVIEW...........................11 Motherboard Layout........................13 Block Diagram ..........................15 Product Options..........................16 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...
  • Page 7 Contents 3. SPECIFICATIONS .......................32 Environmental ..........................32 Thermal ............................32 Regulatory EMC Compliance ...................... 33 Regulatory Safety Compliance..................... 33 Industry Compliance ........................33 Miscellaneous..........................34 Mechanical ........................... 34 3.7.1 Motherboard ......................... 34 3.7.2 I/O Shield ........................36 3.7.3 Fansink ......................... 36 Electrical ............................
  • Page 8 BG845G Product Manual B.10 Controller Part Number ........................ 59 CONNECTOR DESCRIPTIONS..................60 Connector Part Numbers ......................60 AGP Expansion Slot (AGP card mode, where applicable)............62 AGP Expansion Slot (ADD card mode)..................63 PCI Expansion Slot ........................64...
  • Page 9 Contents 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.
  • Page 10 BG845G Product Manual 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.

  • Page 11: Overview

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

  • Page 13: Motherboard Layout

    1. Overview Motherboard Layout The next figure shows the layout of the BG845G motherboard with the major components identified. Figure 1. Motherboard layout 20 21 25 26 27...

  • Page 14: Table 4. Component Identification

    BG845G Product Manual Table 4. Component Identification Description Description Description Serial port 2 header 21 USB 2.0 channel 2 41 PCI bus arbiter Memory sockets 22 USB 2.0 channel 3 42 Operating mode and riser enable jumpers Chipset GMCH heatsink...

  • Page 15: Block Diagram

    1. Overview Block Diagram The next figure shows a block diagram of the BG845G motherboard. Figure 2. Block diagram Clocks Intel Processor Celeron, Pentium 4, Pentium 4-M 478-pin PC1600-PC2700 DIMM 1 PC1600-PC2700 DIMM 0 Slot 1, AGP 1.5V DDR SDRAM Bus...

  • Page 16: Product Options

    BG845G Product Manual 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 Single 10/100 Single 10/100 Dual 10/100 Dual Gigabit (82551ER)

  • Page 17: Configuration

    1. Overview 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.

  • Page 18: Riser Control

    BG845G Product Manual 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.

  • Page 19: Alternate Power Led

    1. Overview 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.

  • Page 20: Motherboard Description

    Motherboard Description 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.

  • Page 21: Chipset

    2. Motherboard Description Chipset The motherboard is based around an Intel 845G family chipset comprising these parts: • Graphics and memory controller hub (GMCH). This includes the processor interface, a high- performance 3D graphics controller and the system memory controller. •...

  • Page 22: Video Modes

    BG845G Product Manual 2.4.2 Video Modes The Intel 845G family chipsets and drivers support a wide variety of video modes as indicated by the next table. Table 7. Supported video modes Resolution Color Depth (bpp) * Refresh Rates (Hz) 640 x 480...

  • Page 23: Network

    2. Motherboard Description Network The BG845G provides one or two Ethernet ports based around Intel controllers. Each channel has an RJ45 connector located on the I/O panel with two integrated LED indicators to provide link status information. The list below describes the features provided by each port.

  • Page 24: Keyboard And Mouse Ports

    BG845G Product Manual The I/O locations can be assigned as follows. • I/O address 378-37Fh & 778-77Fh, IRQ5 or IRQ7 • I/O address 278-27Fh & 678-67Fh, IRQ5 or IRQ7 2.9.3 Keyboard and Mouse Ports Two PS/2 style keyboard and mouse ports are provided on the rear panel. The two ports are interchangeable with the motherboard automatically detecting which peripheral is attached to which port.

  • Page 25: Expansion Cards

    Always ensure that the 5V standby rail can support the required current when using a PCI card that makes use of the 3.3Vaux supply. The BG845G is designed to support a maximum total power consumption of 60W for all four slots (15W each, on average).

  • Page 26: Voltage Monitoring

    BG845G Product Manual 2.14.1 Voltage Monitoring The next table details the motherboard voltage rails monitored and their usage. Table 10. Voltage rails Voltage Rail Usage on Motherboard +12V Serial ports, voltage regulators (including processor), fans, expansion slots. +5.0V Internal logic, keyboard, mouse, USB and video ports, expansion slots.

  • Page 27: Temperature Monitoring

    2. Motherboard Description Table 11. Supported voltages Processor VID Jumper selects Jumper selects Mobile Jumper removed (auto Code (VID4...0) Desktop processor processor select) 01001 1.625V 1.300V 1.300V 01000 1.650V 0.000V (disabled) 0.000V (disabled) 00111 1.675V 0.000V (disabled) 0.000V (disabled) 00110 1.700V 0.000V (disabled) 0.000V (disabled)

  • Page 28: Fan Control

    2.15 Power management The BG845G motherboard implements a number of power management features with software support for APM and ACPI. Where an operating system does not support ACPI, the motherboard defaults to using APM. An APM driver is required by the operating system in order to take advantage of the APM power management features.

  • Page 29: Acpi Wake-Up Support

    2. Motherboard Description 2.15.2 ACPI Wake-up Support The next table indicates which events can cause an ACPI wake-up and from which sleep states. Table 14. ACPI wake-up support Event Sleep State Comment Power switch S1, S4, S5 RTC alarm S1, S4 PS/2 keyboard or mouse Ports are unpowered in S4, S5 USB device (any port)

  • Page 30: Network Status Indicators

    The code is built from a number of software and data modules that can be customized and assembled with a software tool that can be provided by RadiSys. Software to support BIOS updates and crisis recovery is also available -− see the Manuals, Drivers & BIOS section on www.radisys.com...

  • Page 31: Operating Systems Support

    2.18 Operating Systems Support The following operating systems are validated by RadiSys with the BG845G motherboard. Contact RadiSys for information on the support of other operating systems. For device drivers, see the Manuals, Drivers & BIOS section on www.radisys.com. •...

  • Page 32: Specifications

    (or fansink) can reduce the system operating range. Intel Pentium 4 and Celeron processors have a minimum operating temperature of 5°C. The processor and fansink combinations normally supplied as standard with the motherboards are tested by RadiSys to the...

  • Page 33: Regulatory Emc Compliance

    • Intel Pentium 4 and Celeron processors have a minimum operating temperature of 5°C. Refer to the relevant Intel processor datasheet for the maximum operating temperature. Regulatory EMC Compliance When correctly installed in a suitable chassis, the BG845G motherboard is designed to meet these EMC regulations: •...

  • Page 34: Miscellaneous

    3.7.1 Motherboard The BG845G motherboard meets the microATX Motherboard Interface Specification, version 1.1 and the ATX Specification, version 2.1. It measures 9.6 x 9.6 inches and is manufactured using a 4-layer PCB with components on the topside only. The screen-printing includes: •...

  • Page 35: Figure 4. Dimensions And Rear-Panel Connectors

    3. Specifications Figure 4. Dimensions and rear-panel connectors 8.100 8.050 7.650 7.700 7.625 7.550 7.113 7.025 6.100 5.750 5.200 5.163 4.538 4.345 Chipset GMCH Package Center 3.800 3.600 Processor Package Center 3.175 2.005 1.550 1.332 0.838 0.313 0.325 0.000 (0.125) (0.073) (0.638) (0.280)

  • Page 36: I/O Shield

    3.7.2 I/O Shield I/O shields are available for the BG845G when used in a standard ATX or microATX chassis and is illustrated below. The shield press-fits into the chassis shield aperture. The drawing below includes all port apertures and is not intended to show a particular shield variant.

  • Page 37: Electrical

    3. Specifications Electrical 3.8.1 Motherboard Power Consumption The motherboard power consumption is highly dependent on the processor, memory and devices attached and also on the software that is running and the power state that the board is in. The figures given in Table 22 are a guide to the power requirements to expect under selected conditions.

  • Page 38: Power Delivery To Expansion Slots

    BG845G Product Manual 3.8.2 Power Delivery to Expansion Slots The next table indicates the maximum current that should be drawn from each PCI or AGP expansion slot or the total for each riser − do not exceed these ratings. PCI slots are limited to 25W in total on the main +5.0V and +3.3V supplies, all of which can be drawn from either voltage...

  • Page 39: Power Budget

    3. Specifications Note When operating with a hard-switched power supply, the BIOS should be customized with the PSU flag in the enclosure data set to ‘Hard-Switched’ using the tools described in the BIOS Customization section of this document. CAUTION Ensure the power supply can support the required load current on all rails – failure to meet this can cause damage to the power supply or the motherboard.

  • Page 40: General Purpose I/O Lines

    BG845G Product Manual 3.8.5 General Purpose I/O Lines Table 27. General purpose I/O lines Symbol Parameter Conditions Unit Input High Voltage Input Low Voltage –0.3 Input Leakage Current = 3.6V, V = max µA = 0V, V = max –5 µA...

  • Page 41: Motherboard Bios

    4. Motherboard BIOS Motherboard BIOS Configuration The motherboard BIOS includes a Setup utility that can be used to both view and modify the board’s configuration. The settings are stored in CMOS RAM with the default settings held in the flash ROM. To start the utility, press the F2 key when prompted. If ‘silent-boot’ is on (logo displays) then press the ESC key to show the start-up messages.

  • Page 42: Creating A Bios Update Diskette

    BG845G Product Manual Updates are available online from the RadiSys site in the form of a compressed image (ZIP) of a number of files. Using the software contained in the ZIP file, you must first create a flash diskette that is then used for the update or recovery process. Included in the ZIP file is a Readme.txt file that contains information on the update and instructions on how to use it.

  • Page 43: Creating A Bios Recovery Diskette

    Follow the steps below. You need a PC with Microsoft MS-DOS, Windows 95, Windows 98 or Windows NT and a blank diskette. 1. Obtain the update ZIP file from the Manuals, Drivers & BIOS section on the RadiSys web site, www.radisys.com.

  • Page 44: Customization

    CAUTION Exercise caution when updating BIOS that includes a bootblock update. If this process is interrupted, the motherboard cannot be recovered and must be returned to RadiSys for repair. Customization There are a number of features of the BIOS that can be customized and the software to accomplish this is contained within the BIOS OEM kit ZIP file that can be obtained from the Manuals, Drivers &...

  • Page 45: Bios Error Indications

    4. Motherboard BIOS microcode update selections, create a new version of this file by concatenating four microcode updates in binary form — these can be obtained from Intel. BIOS Error Indications Once the motherboard powers-up the BIOS code runs Power-On-Self-Test software to check that the motherboard is operating correctly.
  • Page 46 BG845G Product Manual Table 30. BIOS POST checkpoint codes Addr Description Addr Description Reset Programmable Interrupt Initialize mouse Controller Test DRAM refresh Initialize floppy controller Test 8742 Keyboard Controller Execute auto-typing Set ES segment to register to 4GB Hard disk controller fast pre-...
  • Page 47 4. Motherboard BIOS Table 30. BIOS POST checkpoint codes Addr Description Addr Description Display QuietBoot™ screen Shadow video BIOS ROM Initialize BCVS Display copyright notice Clear parity checkers Display CPU type and speed Boot Menu Initialize EISA board Clear screen (optional) Test keyboard Check virus and backup reminders Set key click if enabled...

  • Page 48: Table 31. Bios Post Checkpoint Codes With Beep

    BG845G Product Manual Table 31. BIOS POST checkpoint codes with beep Checkpoint Code Beep Code Test for unexpected interrupts 2-2-3-1 Initialize hard disk controller 3-2-1-1 Search for option ROMs (beep for bad checksum) One beep before boot A20 Error 4-2-4-4...

  • Page 49: Customer Support

    BIOS updates, support software and documentation. See the Manuals, Drivers & BIOS section. RadiSys hotline numbers for the US and Canada are: Support: (800) 438-4769 Service: (800) 256-5917 The next table displays online specifications and reference material: Table 32.

  • Page 50: Atechnical Reference

    BG845G Product Manual Technical Reference I/O Map Table 33. I/O map Address (hex)* Description 0000 – 000F DMA controller 1 0020 – 0021 Interrupt controller 1 002E – 002F SIO control registers 0040 – 0043 Timer counter 0060 – 0064...

  • Page 51: Pci Interrupt Allocation

    A. Technical Reference Table 33. I/O map Address (hex)* Description 1300 – 133F AC97 audio master 1800 – 182F SIO GPIO and control logic FFA0 – FFA7 Primary IDE bus master registers FFA8 – FFAF Secondary IDE bus master registers Dynamically assigned USB controller (four) (32 locations on 32-byte boundary) Dynamically assigned...

  • Page 52: Pci Device Assignments

    BG845G Product Manual PCI Device Assignments Table 35. PCI device assignments Device Device Function IDSEL Number Number Number Chipset host bridge and memory – controller AGP bridge – Graphics controller – PCI bridge – LPC bridge – (Includes DMA, timers, PIC, APIC, RTC, power &...

  • Page 53: Isa Interrupt Allocation

    A. Technical Reference ISA Interrupt Allocation Whilst the motherboard does not include an ISA bus, it includes an ISA-compatible interrupt controller (PIC) in order to be compatible with AT standard architecture. The interrupts are allocated as described in the next table. Table 37.

  • Page 54: Bios Organization

    BG845G Product Manual BIOS Organization The BIOS ROM is a 4or 8Mbit device containing eight or sixteen symmetrical 64KB blocks. The next figure shows how the ROM stores code and control information. The addresses shown refer to the ROM image at the top of the 4GB-address space. Note that the system BIOS segment is compressed in this image.

  • Page 55: Bcontrol Registers

    B. Control Registers Control Registers Notes • The following abbreviations are used in register descriptions: R=Read RO=Read only R/W=Read/Write W=Write only • The MSB (Most Significant Bit) is listed first. Index Register Version Index I/O location: 062h Default: vvvv1010b Version A read-only field containing the software version number for the logic.

  • Page 56: Watchdog Kick

    Enable and start watchdog timer Use of this feature normally requires a custom BIOS – contact RadiSys for more information. The standard BIOS does not route the SMI and thus ignores the event – causing a system reset after the second timeout unless the timer is restarted.

  • Page 57: Watchdog Timeout Period

    B. Control Registers Timer enable: Timer is disabled Timer is enabled and counting Watchdog Timeout Period Watchdog timeout period I/O location: 066h Index Default: 11111111b Timeout period Do not use (causes immediate timeout) 1–255 Timeout period in units of 1 x prescale value seconds General Purpose I/O Port 1 I/O location: 066h...

  • Page 58: Pwm Control

    BG845G Product Manual into this register and reads reflect the value written. When programmed as inputs, writes are ignored and a read follows the state of the GPIO port 2 signal. Direction control is via the D201 control. P22, GPIO Port 2 data: This bit is output only.

  • Page 59: Controller Part Number

    B. Control Registers Pentium 4-M detected: Pentium 4-M Pentium 4 or Celeron Processor voltage ID (selected by processor): Returns the voltage identification value presented by the processor. B.10 Controller Part Number The controller part number format is 97-xxyy-0v where v is version number (top 4 bits of index register), xx is the byte 2 value and yy is the byte 1 value.

  • Page 60: Cconnector Descriptions

    BG845G Product Manual Connector Descriptions Note: Connector views in the following sections are shown from the motherboard side. Connector Part Numbers The various motherboard connectors are listed in the next table along with the part number of one of the approved vendors. The list is intended to assist in the selection of mating connectors.
  • Page 61 C. Connector Descriptions Table 39. Connector part numbers Connector Part Number Type Double stack audio jacks Foxconn JA23331-G16 Double vertically stacked 3.5mm Internal USB headers Foxconn HF01051 5-pin locking ATAPI-style, black Remote thermal sensor Foxconn HF55020 2-pin 2mm header SMBus header Foxconn HF55040 4-pin 2mm header Lithium cell holder...

  • Page 62: Agp Expansion Slot (Agp Card Mode, Where Applicable)

    BG845G Product Manual AGP Expansion Slot (AGP card mode, where applicable) The AGP/ADD slot supports only 1.5V signaling. Table 40. AGP/ADD slot Signal Signal Signal Signal +12V VDDQ1.5 VDDQ1.5 Not Used AD22 AD21 Not Used AD20 AD19 Reserved Not Used...

  • Page 63: Agp Expansion Slot (Add Card Mode)

    C. Connector Descriptions AGP Expansion Slot (ADD card mode) The AGP/ADD slot supports only 1.5V signaling. Table 41. AGP/ADD expansion slot Signal Signal Signal Signal +12V VDDQ1.5 VDDQ1.5 Not Used DVOCD3 DVOCD2 Not Used DVOCD1 DVOCD0 Not Used Not Used Not Used DVOCHSYNC DVOCBLANK...

  • Page 64: Pci Expansion Slot

    BG845G Product Manual Table 41. AGP/ADD expansion slot Signal Signal Signal Signal Not Used Not Used DVOBD9 DVOBD8 +3.3VAUX DVOBD7 DVOBD6 Not Used +3.3V +3.3V VDDQ1.5 VDDQ1.5 DVOBCINTR# DVOCFLDSTL DVOBCLK# DVOBCLK DVOCD11 DVOCD10 DVOBD5 DVOBD4 +3.3V +3.3V DVOCD9 DVOCD8 DVOBD3...

  • Page 65: Table 43. Pci Slot 2 Riser Extension

    C. Connector Descriptions Table 42. PCI expansion slot Signal Signal Signal Signal AD11 AD12 GNT# AD10 REQ# PME# AD30 AD31 +3.3V AD29 C/BE0# AD28 +3.3V AD26 AD27 +3.3V AD25 AD24 +3.3V IDSEL C/BE3# +3.3V AD23 AD22 AD20 AD21 REQ64# ACK64# AD19 AD18 +3.3V...

  • Page 66: Table 44. Pci Slot 3 Riser Support

    BG845G Product Manual Table 44. PCI Slot 3 Riser Support Description Description LPCAD0 LPCAD3 LPCAD1 IDSEL2 LPCAD2 CLK5 GNT2# REQ2# REQ5# LPCFRAME# GNT5# CLK2 IDSEL5 Table 45. PCI Slot 4 Riser Support Description Description CLK6 IDSEL5 GNT5# REQ5# REQ6# CLK5...

  • Page 67: Table 48. Front Panel Header

    C. Connector Descriptions Table 48. Front Panel Header Description Description HDLED+ GREENLED+ HDLED- GREENLED- RESETSW- PWRSW+ RESETSW+ PWRSW- +5V fused SPKR+ SPKR- Not Used SPKR- Not Used TMPSW+ Not Used TMPSW- Not Used Table 49. VGA Monitor Description Description GREEN BLUE Reserved Reserved...

  • Page 68: Table 50. Parallel Port

    BG845G Product Manual Table 50. Parallel Port Description Description STB# AFD# ERR# INIT# SLIN# ACK# BUSY SLCT Table 51. Serial Port 1 Description Description RING Table 52. Serial Port 2 Description Description RING...

  • Page 69: Table 53. Ethernet Led Header

    C. Connector Descriptions Table 53. Ethernet LED Header Description Description 330R Pullup ACTIVITY2# LINK2# 1000MB2# 100MB2# 330R Pullup ACTIVITY1# 330R Pullup LINK1# 1000MB1# 100MB1# Table 54. RJ45 Ethernet (10/100) Description Description TxD+ 75Ω AC termination TxD- RxD- RxD+ 75Ω AC termination 75Ω...

  • Page 70: Table 58. Ide Drive Headers

    BG845G Product Manual Table 58. IDE Drive Headers Description Description RST# IOW# IOR# IORDY CSEL DAK# Not Used CBLID# CS1# CS3# HDACT# IRQ14 for Primary, IRQ15 for Secondary...

  • Page 71: Table 59. Diskette Drive Header

    C. Connector Descriptions Table 59. Diskette Drive Header Description Description DENSEL Not Used DRATE0 INDEX# MTR0# Not Used DS0# Not Used DIR# STEP# WDATA# WGATE# TRK0# RDATA# HDSEL# DSKCHG# Table 60. GPIO Header Description Description +5V fused GPIO20 GPIO21 GPO22 GPIO10 GPIO11 GPIO12...

  • Page 72: Table 61. Ps/2 Keyboard

    BG845G Product Manual Table 61. PS/2 Keyboard Description Description KDATA MDATA KCLOCK MCLOCK Table 62. PS/2 Mouse Description Description DATA CLOCK Not Used Not Used Table 63. Keyboard Header Description Description DATA CLOCK Table 64. Mouse Header Description Description DATA CLOCK Table 65.

  • Page 73: Table 67. Mic Jack

    C. Connector Descriptions Table 67. MIC Jack Description Description MIC MONO INPUT SLEEVE RING BIAS VOLTAGE Table 68. Processor and System Fan 1 & 2 Description Description TACH# POWER Table 69. Remote Thermal Sensor Description Description DIODE+ DIODE- Table 70. SMBus Header Description Description...

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