Chapter 5
71
Front Panel Header
The front panel header (F_PANEL) provides a standard set of switch and LED headers commonly found on
ATX or micro-ATX cases. Refer to the table below for information:
Illustration
Pin
Signal
Function
Pin
Signal
Funcation
1
HD_LED_P
Hard disk LED (+)
2
FP PWR/SLP
MSG LED [dual color
or single color (+)]
3
HD_LED_N Hard disk active LED
(-)
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
Key
No Pin
Signal
Description
Hard Drive 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 pins 2 and 4 to a single- 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 50 ms to signal
the power supply to switch on or off. The time requirement is
due to internal de-bounce circuitry. After receiving a power on/
off signal, at least two seconds elapses before the power
supply recognizes another on/off signal.