Motherboard Description
25
1.10.11.2 Reset
This header can be connected to a momentary SPST type switch that is normally open. When the
switch is closed, the system will hard reset and run POST.
1.10.11.3 Sleep or Power LED
This header can be connected to an LED to provide a light when the system is powered on. This
LED will also blink when the system is in a power-managed state.
1.10.11.4 HD LED
This header can be connected to an LED to provide a visual indicator for when an IDE hard drive
connected to the onboard IDE controller is being read or written.
1.10.11.5 Infra-Red (IrDA) connector
Serial port 2 can be configured to support an IrDA module via a 5 pin header connector . Once
configured for IrDA, the user can transfer files to or from portable devices such as laptops, PDA’s
and printers using application software such as LapLink. The IrDA specification provides for data
transfers at 115 Kbps from a distance of 1 meter. A pin is also designated for hardware Consumer
IR support.
1.10.11.6 Sleep / resume
When Advanced Power Management (APM) is activated in the system BIOS and the Operating
System’s APM driver is loaded, Sleep mode (Stand-By) can be entered in one of three ways: an
optional front panel “Sleep/Resume” button, a user defined keyboard hot key, or prolonged system
inactivity. The Sleep/Resume button is supported by a 2-pin header (pins 3 and 4) located on the
front panel I/O connector (J9E2). Closing the “Sleep” switch will generate an SMI (System
Management Interrupt) to the processor which immediately goes into System Management Mode
(SMM), the so called “Sleep” mode.
The front panel “Sleep” switch must be a momentary two pin SPST type that is normally open.
The function of the Sleep/Resume button can also be achieved via a keyboard hot-key sequence, or
by a time-out of the system inactivity timer. Both the keyboard hot-key and the inactivity timer are
programmable in the BIOS setup (timer is set to 10 minutes by default). To re-activate the system,
or “Resume”, the user must simply press the sleep/resume button again, or use the keyboard or
mouse. Mouse activity will only “wake up” the system if a mouse driver is loaded. While the
system is in “sleep” mode it is fully capable of responding to and servicing external interrupts
(such as in-coming FAX) even though the monitor will only turn on if a user interrupt
(keyboard/mouse) occurs as mentioned above