Mainboard K8NF4X–754
12
Reset Switch Header
(Blue)
: RST_SW
This header can be attached with a momentary SPST button cord. The switch is normally left
open. When the switch closed, it will cause the mainboard to reset and run the POST
(Power-On Self Test).
Power-on Switch Header
(Orange)
: PWR_SW
This header can be attached with a PC front panel power switch cord. The power switch cord
must pull the power switch pin to ground for at least 50 ms to signal the power supply to turn
on or off (the time required is due to internal debounce circuitry on the system board). At
least two seconds must pass before the power supply will recognize another on/off signal.
Power LED Header
(Green)
: PWR_LED
Attach the power LED cord onto this header, then the power LED will illuminate while the
system is powered on.
Speaker Header
(Purple)
: SPEAKER
A PC front panel speaker cord can attach onto this header. When you reboot the system, the
speaker will sound a short “beep”. If there is something wrong during the Power On Self-Test,
the speaker otherwise will sound “irregular beep” to let you know.
Headers & Jumpers
Front USB Headers: USB1/2
There are four USB 1.1/2.0 ports have provided on this mainboard, and it also provides two
front USB headers which allowing you to set four additional USB ports on your PC front
panel. An optional USB bracket may be included within this product and you can attach more
USB devices on it.
Pin
Assignment
Pin
Assignment
1 +5V
(fused)
2 +5V
(fused)
3 USB-
4 USB-
5 USB+
6 USB+
7 Ground
8 Ground
USB1/USB2
9 Key
10
N/A
Pin
Assignment
Pin
Assignment
1 PC_BEEP 2 N/C
SPEAKER
3 Ground
4 +5V
Attention
If you are using a USB 2.0 device with Windows 2000/XP, you will
need to install the USB 2.0 driver from the Microsoft
®
website. If you
are using Service pack 1 (or later) for Windows
®
XP, and using
Service pack4 (or later) for Windows® 2000, you will not have to
install the driver.