Intel Desktop Board DH77EB Technical Product Specification
54
For information about
Refer to
Power supply considerations
Section 2.5.1 on page 60
2.2.2.4
Front Panel Header
This section describes the functions of the front panel header. Table 31 lists the signal
names of the front panel header. Figure 11 is a connection diagram for the front panel
header.
Table 31. Front Panel Header
Pin Signal Name
Description
Pin Signal Name
Description
1
HDD_POWER_LED
Pull-up resistor (750
Ω) to +5V
2
POWER_LED_MAIN
[Out] Front panel LED
(main color)
3
HDD_LED#
[Out] Hard disk
activity LED
4
POWER_LED_ALT
[Out] Front panel LED
(alt color)
5
GROUND
Ground
6
POWER_SWITCH#
[In] Power switch
7
RESET_SWITCH#
[In] Reset switch
8
GROUND
Ground
9
+5V_DC
Power
10
Key
No pin
Figure 11. Connection Diagram for Front Panel Header
2.2.2.4.1
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 a SATA hard
drive or optical drive connected to an onboard SATA connector.
