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Technical Reference
51
2.2.2.5.1 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
2.2.2.5.2 Reset Switch Header
Pins 5 and 7 can be connected to a momentary single pole, single throw (SPST) type
switch that is normally open. When the switch is closed, the board resets and runs the
POST.
2.2.2.5.3 Power/Sleep LED Header
Pins 2 and 4 can be connected to a one- or two-color LED.
Table 23 shows the
possible states for a one-color LED.
Table 24 shows the possible states for a two-color
LED.
Table 23. States for a One-Color Power LED
LED State Description
Off Power off/sleeping
Steady Green Running
Table 24. States for a Two-Color Power LED
LED State Description
Off Power off
Steady Green Running
Steady Yellow Sleeping
NOTE
The colors listed in Table 23 and Table 24 are suggested colors only. Actual LED
colors are chassis-specific.
2.2.2.5.4 Power Switch Header
Pins 6 and 8 can be connected to a front panel momentary-contact power switch. The
switch must pull the SW_ON# pin to ground for at least 50 ms to signal the power
supply to switch on or off. (The time requirement is due to internal debounce circuitry
on the board.) At least two seconds must pass before the power supply will recognize
another on/off signal.