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Chapter 4: Motherboard Connections
Ethernet Ports
Two Gigabit Ethernet ports (LAN1, LAN2) are located on the I/O back panel. These Ethernet
ports support 1GbE LAN connections on the X12DAi-N6. All of these ports accept RJ45
cables. Please refer to the LED Indicator section for LAN LED information.
LAN Port
Pin Definition
Pin#
Definition
Pin#
Definition
1
TD0-
11
P3V3_Dual
2
TD0+
12
Act LED (Yellow)
3
TD1-
13
Link 1000
(Amber)
4
TD1+
14
Link 100 LED
(Green)
5
TD2-
15
GND
6
TD2+
16
GND
7
TD3-
17
GND
8
TD3+
18
GND
9
COMMCT
10
GND
Universal Serial Bus (USB) Ports
There are four USB 3.0 ports (USB0/1/2/3) and one USB 3.1 ports (USB4) located on the
I/O back panel. The motherboard also has a front-accessible USB 3.0 header that provides
two USB 3.0 connections (USB5/6) and a front-accessible USB 3.2 Gen 2x1 Type C header
(USB7).
The onboard headers can be used to provide front side USB access with a cable
(not included).
Back Panel USB 0/1/2/3 (3.0)
Pin Definitions
Pin#
Definition
Pin#
Definition
A1
VBUS
B1
Power
A2
D-
B2
USB_N
A3
D+
B3
USB_P
A4
GND
B4
GND
A5
Stda_SSRX-
B5
USB3_RN
A6
St
B6
USB3_RP
A7
GND
B7
GND
A8
Stda_SSTX-
B8
USB3_TN
A9
St
B9
USB3_TP
Front Panel USB 5/6 (3.0)
Pin Definitions
Pin#
Definition
Pin#
Definition
1
VBUS
19
Power
2
Stda_SSRX-
18
USB3_RN
3
St
17
USB3_RP
4
GND
16
GND
5
Stda_SSTX-
15
USB3_TN
6
St
14
USB3_TP
7
GND
13
GND
8
D-
12
USB_N
9
D+
11
USB_P
10
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