Intel BLKDQ57TM, Specification, Page: 55 / 97

Technical Reference
55
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 one of the
following:
• SATA storage device connected to an onboard SATA connector
• PATA storage device connected to the onboard PATA connector
• Intel Z-U130 USB Solid State Drive (or compatible device) connected to one of the
front panel USB headers
2.2.2.4.2 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.
2.2.2.4.3 Power LED Header
Pins 2 and 4 can be connected to a one- or two-color LED. Table 29 shows the default
states for this LED. More options are available through BIOS setup.
Table 29. States for a One-Color Power LED
LED State Description
Off Power off/sleeping
Steady Lit Running
Blink Standby
2.2.2.4.4 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.
2.2.2.5 Alternate Front Panel Power LED Header
Pins 1 and 3 of this header duplicate the signals on pins 2 and 4 of the front panel
header.
Table 30. Alternate Front Panel Power LED Header
Pin Signal Name In/Out Description
1 Out
2 Not connected
3 FP_LED − Out FP_LED −