Chapter 5 75
Front Panel Connector
The front panel connect (PANEL 1) provides a standard set of switch and LED connectors commonly
found on ATX or micro-ATX cases. Refer to the table below for information:
Setting Pin Signal Function Pin Signal Function
1 HD_LED_P Hard disk LED
([positive)
2 FP PWR/SLP MSG LED(dual
color or single
color (+))
3 HD_LED_N Hard disk active
LED (negative)
4 FP PWR/SLP MSG LED( dual
color or single
color(-))
5 RST_SW_N Reset Switch 6 PWR_SW_P Power Switch
7 RST_SW_P Reset Switch 8 PWR_SW_N Power Switch
9 RSVD Reserved 10 NC No Pin
Function Description
Hard Disk Activity LED Connecting pins 1 and 3 to a front panel mounted LED provides visual
indication that data is being read from or written to the hard drive. For
the LED to function properly, an IDE drive should be connected to the
onboard IDE interface. The LED will also show activity for devices
connected to the SCSI ( hard drive activity LED ) connector.
Power/Sleep/ Message Waiting
LED
Connecting pis 2 and 4 to a signal- or dual-color, front panel mounted
LED provides power on/off, sleep, and message waiting indication.
Reset Switch Supporting the reset function requires connecting pins 5 and 7 to a
momentary-contact switch that is normally open. When the switch is
closed, the board resets and runs POST.
Power Switch Supporting the power on/off function requires connecting pins 6 and 8
to a momentary-contact switch that is normally open. The switch
should maintain contact for at least 50ms to signal the power supply to
switch on or off. The time requirement is due to internal debounce
circuitry. After receiving a power on/off signal, at lease two seconds
elapses before the power supply recognizes another on/off signal.
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