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Contents
Connectors
Caution: Only the back panel, the front panel audio, and the front panel USB connectors of the Intel® Desktop Board D845BG have overcurrent protection. The Intel Desktop Board D845BG's internal connectors are not overcurrent protected and should connect only to devices inside the computer's chassis, such as fans and internal peripherals. Do not use these connectors to power devices external to the computer's chassis. A fault in the load presented by the external devices could cause damage to the computer, the interconnecting cable, and the external devices themselves.
This section describes the board's connectors. The connectors can be divided into the following groups: Note: When installing the board in a microATX chassis, make sure that peripheral devices are installed at least 1.5 inches above the main power connector, the diskette drive connector, the IDE connector, and the DIMM sockets.
Back Panel I/O Connectors
The figure below shows the location of the back panel connectors. The back panel connectors are color-coded in compliance with PC 99 recommendations. The figure legend below lists the colors used. 
| Item | Description | Color | | A | PS/2 mouse port | Green | | B | PS/2 keyboard port | Purple | | C | USB port (Optional) | Black | | D | USB port (Optional) | Black | | E | Serial port A | Teal | | F | Parallel port | Burgundy | | G | LAN (Optional) | Black | | H | USB Port | Black | | I | USB Port | Black | | J | Mic in | Pink | | K | Audio line out | Lime green | | L | Audio line in | Light blue |
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Note: The USB ports adjacent to the PS/2 ports are not populated if the USB 2.0 option is supported.
Note: The back panel audio line out connector is designed to power headphones or amplified speakers only. Poor audio quality occurs if passive (non-amplified) speakers are connected to this output.
Internal I/O Connectors
The internal I/O connectors are divided into the following functional groups:
Audio
The figure below shows the location of the audio connectors.
| Item | Description | Color | | A | Auxiliary line in, ATAPI style | White | | B | ATAPI CD-ROM | Black |
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Power and Hardware Control Connectors
The figure below shows the location of the power and hardware control connectors.
| Item | Description | | A | +12 V power connector (ATX12V) | | B | Rear chassis fan | | C | Processor fan | | D | Main power | | E | Front chassis fan | | F | Chassis intrusion |
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Note: Use only ATX12V- or SFX12V-compliant power supplies with the Intel Desktop Board D845BG. ATX12V and SFX12V power supplies have an additional power lead that provides required supplemental power for the Pentium®4 processor. Always connect the 20-pin and 4-pin leads of ATX12V and SFX12V power supplies to the corresponding connectors on the Intel Desktop Board D845BG's, otherwise the board will not boot.
Add-in Board and Peripheral Interface Connectors
The figure below shows the location of the add-in board connector and peripheral connectors. Note the following considerations for the PCI bus connectors: - All of the PCI bus connectors are bus master capable.
- PCI bus connector 1 has SMBus signals routed to it. This enables PCI bus add-in boards with SMBus support to access sensor data on the board. The specific SMBus signals are as follows:
- The SMBus clock line is connected to pin A40
- The SMBus data line is connected to pin A41
| Item | Description | | A | Communication and Networking Riser (CNR) | | B | PCI bus connector 6 | | C | PCI bus connector 5 | | D | PCI bus connector 4 | | E | PCI bus connector 3 | | F | PCI bus connector 2 | | G | PCI bus connector 1 | | H | AGP connector | | I | Diskette drive | | J | Primary IDE | | K | Secondary IDE | | L | SCSI LED |
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External I/O Connectors
The figure below shows the location of the external I/O connectors.
| Item | Description | | A | Front panel audio | | B | Serial port B | | C | Auxiliary front panel power/sleep/message-waiting LED | | D | Front panel | | E | Front panel USB |
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Front Panel Connector
This section describes the functions of the front panel connector. The table below lists the signal names of the front panel connector.
| Pin | Signal | In/Out | Description | Pin | Signal | In/Out | Description | | Hard Drive Activity LED | Power LED | | 1 | HD_PWR | Out | Hard disk LED pull-up (330 ohm) to +5 V | 2 | HDR_BLNK_GRN | Out | Front panel green LED | | 3 | HAD# | Out | Hard disk active LED | 4 | HDR_BLNK_YEL | Out | Front panel yellow LED | | Reset Switch | On/Off Switch | | 5 | Ground | | Ground | 6 | FPBUT_IN | In | Power switch | | 7 | FP_RESET# | In | Reset switch | 8 | Ground | | Ground | | No Connect | Miscellaneous | | 9 | +5 V | Out | Power | 10 | N/C | | Not connected | | 11 | N/C | | No connect | 12 | Ground | | Ground | | 13 | Ground | | Ground | 14 | (pin removed) | | Not connected | | 15 | N/C | | No connect | 16 | +5 V | Out | Power |
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For more information about the front panel connector, see the Intel® Desktop Board D845BG Technical Product Specification
This applies to:
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