Intel DQ57TM Intel Desktop Board DQ57TML Technical Product Specification - Page 55
Alternate Front Panel Power LED Header
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Technical Reference 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 1 FP_LED+ 2 Not connected 3 FP_LED− In/Out Out Out Description FP_LED+ FP_LED− 55