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Chapter 3: Motherboard Connections
Universal Serial Bus (USB) Header
There are two USB 2.0 headers (USB0/1, USB2/3) and one USB 3.1 header (USB8/9) on
the motherboard to provide two USB 3.1 Type A front access connection with a cable (not
included). There are also four USB 3.1 ports (USB4/5, USB6/7) on the I/O back panel.
Front Panel USB (3.1) Header
Pin Definitions
Pin#
Definition
Pin#
Definition
1
GND
11
GND
2
TX1+
12
TX2-
3
TX1-
13
TX2+
4
GND
14
GND
5
RX1+
15
RX2-
6
RX1-
16
RX2+
7
GND
17
GND
8
D1+
18
D2+
9
D1-
19
D2-
10
VBUS1
20
VBUS2
Front Panel USB 2.0 Header
Pin Definitions
Pin#
Definition
Pin#
Definition
1
+5V
2
+5V
3
USB_PN2
4
USB_PN3
5
USB_PP2
6
USB_PP3
7
Ground
8
Ground
9
Key
10
Ground
Back Panel USB (3.1) Header
Pin Definitions
Pin#
Definition
Pin#
Definition
1
GND
11
GND
2
TX1+
12
TX2-
3
TX1-
13
TX2+
4
GND
14
GND
5
RX1+
15
RX2-
6
RX1-
16
RX2+
7
GND
17
GND
8
D1+
18
D2+
9
D1-
19
D2-
10
VBUS1
20
VBUS2
