Asus F1A55-M LX3 R2.0 - Manual (Page 37)

7. USB 2.0 connectors (10-1 pin USB56, USB78)
These connectors are for USB 2.0 ports. Connect the USB module cable to any of
these connectors, then install the module to a slot opening at the back of the system
chassis. These USB connectors comply with USB 2.0 specification that supports up to
480Mbps connection speed.
Never connect a 1394 cable to the USB connectors. Doing so will damage the
motherboard!
The USB 2.0 module is purchased separately.
F1A55-M LX3 PLUS R2.0
F1A55-M LX3 PLUS R2.0 USB2.0 connectors
PIN 1
USB+5V USB_P6- USB_P6+ GND NC
USB+5V USB_P5- USB_P5+
GND
USB56
PIN 1
USB+5V USB_P8- USB_P8+ GND NC
USB+5V USB_P7- USB_P7+
GND
USB78
ASUS F1A55-M LX3 R2.0 Series 1-27