Technical Reference
55
2.8.2.3
Front Panel Header
This section describes the functions of the front panel header. Table 27 lists the signal
names of the front panel header. Figure 17 is a connection diagram for the front panel
header.
Table 27. Front Panel Header
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 to +5 V
2
HDR_BLNK_GRN Out
Front panel green
LED
3
HDA#
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
Power Not
Connected
9
+5
V Power
10
N/C
Not
connected
OM18331
Hard Drive
Activity LED
Reset
Switch
+5 V DC
N/C
Power
Switch
+
-
+
-
1
9
8
7
6
5
4
2
3
Dual-
colored
Power LED
Single-
colored
Power LED
+
-
Figure 17. Connection Diagram for Front Panel Header
2.8.2.3.1
Hard Drive Activity LED Header
Pins 1 and 3 can be connected to an LED to provide a visual indicator that data is
being read from or written to a hard drive. Proper LED function requires one of the
following:
•
A Serial ATA hard drive connected to an onboard Serial ATA connector
•
A Parallel ATA IDE hard drive connected to an onboard Parallel ATA IDE connector