Asus A55M-A/USB3 - Manual (Page 40)

8. USB 2.0 connectors (10-1 pin USB56, USB34)
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.
A55M-A/USB3
A55M-A/USB3 USB2.0 connectors
PIN 1
USB+5V USB_P6- USB_P6+ GND NC
USB+5V USB_P5- USB_P5+
GND
USB56 USB34
PIN 1
USB+5V USB_P4- USB_P4+ GND NC
USB+5V USB_P3- USB_P3+
GND
Chapter 1: Product introduction 1-28