L4IBMG2 / L4IBMGL2 V1.0b
13
Front Panel Connector
The front panel connector (PANEL1) provides a standard set of switch and
LED connectors commonly found on ATX or micro-ATX cases. Refer to the
table below for information:
2 1
10 9
PANEL1
Pin
Signal Name
Function
1
HD_LED_P
Hard disk LED pull up (330 ohm) to +5V
2
FP PWR/SLP
MSG LED pull up (330 ohm) to +5V
3
HD_LED_N
Hard disk active LED
4
GND
Ground
5
RST_SW_N
Reset Switch low reference pull down (100
ohm) to GND
6
PWR_SW_P
Power Switch high reference pull up
(10000 ohm) to +5V
7
RST_SW_P
Reset Switch high reference pull up (1000
ohm) to +5V
8
PWR_SW_N
Power Switch high ref erence pull down
(100 ohm) to GND
9
RSVD
Reserved (do not use)
10
NC
No pin
Hard Drive Activity LED
Connecting pins 1 and 3 to a front panel mounted LED provides visual indica-
tion 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 inte r-
face. The LED will also show a ctivity 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 momen-
tary-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 d ebounce circuitry. After receiving a power
on/off signal, at least two seconds elapses before the power supply recog-