IMB520R / 521R LGA1151 ATX Motherboard
Board and Pin Assignments
21
2.5.20
Internal USB 3.1 Gen1 Connector (CN21)
The CN21 is a 19-pin internal connector for installing versatile USB 3.1 compliant
peripherals.
2.5.21
VGA and DVI-D Connector (CN3)
CN3 is a double-deck connector comprising an lower connector for DVI-D port and a
upper connector for VGA port.
The high rise DVI-D connector provides transmission of fast and high quality video
signals between a source device (graphic card) and a display device (monitor).
The 15-pin D-Sub connector is commonly used for VGA display.
Pin Signal
Pin
Signal
1
VBUS0
2
SSRX5-
19
VBUS1
3
SSRX5+
18
SSRX6-
4
GND
17
SSRX6+
5
SSTX5-
16
GND
6
SSTX5+
15
SSTX6-
7
GND
14
SSTX6+
8
USB10-
13
GND
9
USB10+
12
USB11-
10
ID
11
USB11+
Pin Signal
Pin
Signal
1
TX2-
2
TX2+
3
Ground
4
NC
5
NC
6
DVI_SPD_CLK
7
DVI_SPD DATA
8
NC
9
TX1-
10
TX1+
11
Ground
12
NC
13
NC
14
VGAVCC
15
Ground
16
HPDETECT
17
TX0-
18
TX0+
19
Ground
20
NC
21
NC
22
Ground
23
TXC+
24
TXC-
Pin Signal
Pin Signal
1
Red
2
Green
3
Blue
4
NC
5
GND
6
GND
7
GND
8
GND
9
VCC
10
GND
11
NC
12
DDC DATA
13
Horizontal Sync
14
Vertical Sync
15
DDC CLK
