Updated: Thursday, December 5, 1996

Contents

• Motherboard Connectors
• Front Panel Connections
• Back Panel Connections

Motherboard Connectors
The diagrams below show the connectors on the motherboard. Pinouts and signal names for each connector are available in the Technical Product Specification. Note: The shared PCI slot (J4A2) does not support bus mastering.

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Front Panel Connections (J3A1, J2A1)
The PR440FX motherboard provides header connectors to support functions typically located on the chassis bezel.

Front panel features supported include:

• Power Switch
• Power LED
• Sleep switch
• Hard Drive activity LED
• Reset Switch
• Speaker

• Remote On/Off and Soft Power Support
  For power supplies that support the Remote On/Off feature, pins 1 and 2 of the front panel connectors (pins 1 and 2 of J12G1) should be connected to the system power On/Off switch. The power On/Off button should be a momentary SPST switch that is normally open. The power supply control signal (SW_ON) is supported by the primary power connector. Traditional power supplies with mechanical On/Off switches that do not support Remote On/Off or Soft Off by-pass this circuit. After turning the system on by pushing the power On/Off button, the motherboard (with a power supply that supports Remote On/Off) can be turned off from one of two sources:
  • Front panel power On/Off switch
  • Soft Off signal (coming from the I/O controller)
  Soft Off signal can be controlled by the operating system. In Soft Off, an APM command issued to the system BIOS causes the power supply to turn off with the SW_ON control signal on the power connector.

• Sleep / Resume
  When advanced power management (APM) is activated in the system BIOS and the Operating System’s APM driver is loaded, the system can enter Sleep (Standby) in one of three ways:
  • Optional front panel Sleep/Resume button
  • Hot key (defined in Setup), or mouse button (if mouse driver loaded)
  • Prolonged system inactivity; the default is 10 minutes and can be changed in Setup
  The Sleep/Resume button is supported by a 2-pin header located on the front panel I/O connector. The front panel Sleep switch is a momentary two pin SPST type that is normally open.

  Closing the Sleep switch generates an SMI (System Management Interrupt) to the processor which immediately goes into System Management Mode (SMM). While the system is in Sleep mode it is fully capable of responding to and servicing external interrupts (such as incoming FAX) even though the monitor turns on only if a keyboard or mouse interrupt occurs. To reactivate the system, or "Resume," you must press the sleep / resume button again, or use the keyboard or PS/2 mouse.

• System Reset
  You can connect this header to a momentary SPST type switch that is normally open. When the switch is closed, the board resets, and runs the POST.

• Speaker
  The external speaker provides error beep code information during the Power-On Self Test, if the system cannot use the video interface.

Back Panel Connections
The motherboard has PS/2 style keyboard and mouse connectors, two USB connectors, one RJ-45 LAN connector, one serial port connector, one parallel port connector, one MIDI/Gameport connector, and Line In, Line Out, and Mic In audio jacks. The drawing below shows the location of the connectors.

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