51
Chapter 4: Motherboard Connections
Universal Serial Bus (USB) Header
There are three USB 2.0 headers (USB1/2, USB3/4, USB5/6), one USB 3.1 Gen 1 header
(USB7/8), one USB 3.1 Gen 2 header (USB13/14), and one USB 2.0 Type-A header (USB0)
on the motherboard to provide front access connection with a cable (not included). There
are also four USB 3.1 Gen 2 ports on the I/O back panel. USB9, USB10, and USB12 are
Type-A while USB11 is Type-C.
Front Panel USB 2.0 Header
(USB1/2/3/4/5/6)
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
Front Panel USB 3.1 Gen 1 Header
(USB7/8)
Pin Definitions
Pin#
Definition
Pin#
Definition
1
VBUS
11
In
2
IntA_P1_SSRX-
12
IntA_P2_D-
3
IntA_
13
GND
4
GND
14
IntA_
5
IntA_P1_SSTX-
15
IntA_P2_SSTX-
6
IntA_
16
GND
7
GND
17
IntA_
8
IntA_P1_D-
18
IntA_P2_SSRX-
9
In
19
VBus
10
ID
Front Panel USB 3.1 Gen 2 Header
(USB13/14)
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
VBUS
20
VBUS
* USB 3.1 Gen 1 is also referred to as USB 3.0
