Intel D848PMB Technical Product Specification - Page 62

Power/Sleep/Message Waiting LED Connector

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Intel Desktop Board D848PMB Technical Product Specification 2.8.3.2.1 Hard Drive Activity LED Connector 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 2.8.3.2.2 Reset Switch Connector 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. 2.8.3.2.3 Power/Sleep/Message Waiting LED Connector Pins 2 and 4 can be connected to a one- or two-color LED. Table 33 shows the possible states for a one-color LED. Table 34 shows the possible states for a two-color LED. Table 33. States for a One-Color Power LED LED State Description Off Power off/sleeping Steady Green Running Blinking Green Running/message waiting Table 34. States for a Two-Color Power LED LED State Off Steady Green Blinking Green Steady Yellow Blinking Yellow Description Power off Running Running/message waiting Sleeping Sleeping/message waiting ✏ NOTE To use the message waiting function, ACPI must be enabled in the operating system and a message-capturing application must be invoked. 2.8.3.2.4 Power Switch Connector 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. 62

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Intel Desktop Board D848PMB Technical Product Specification
62
2.8.3.2.1
Hard Drive Activity LED Connector
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
2.8.3.2.2
Reset Switch Connector
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.
2.8.3.2.3
Power/Sleep/Message Waiting LED Connector
Pins 2 and 4 can be connected to a one- or two-color LED.
Table 33 shows the possible states for
a one-color LED.
Table 34 shows the possible states for a two-color LED.
Table 33.
States for a One-Color Power LED
LED State
Description
Off
Power off/sleeping
Steady Green
Running
Blinking Green
Running/message waiting
Table 34.
States for a Two-Color Power LED
LED State
Description
Off
Power off
Steady Green
Running
Blinking Green
Running/message waiting
Steady Yellow
Sleeping
Blinking Yellow
Sleeping/message waiting
✏
NOTE
To use the message waiting function, ACPI must be enabled in the operating system and a
message-capturing application must be invoked.
2.8.3.2.4
Power Switch Connector
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.