mITX-SKL-H – User Guide, Rev.1.1
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7.3.
USB Connectors (I/O Area)
The mITX-SKL-H contains an xHCI (Enhanced Host Controller Interface) controller that supports six USB 2.0 ports
allowing data transfers up to 480 Mb/s.
The XHCI controller supports up to four USB 3.0 ports allowing data transfers up to 5 Gb/s. Two of the USB 3.0 ports
are shared with two of the USB 2.0 ports (USB1 – USB2).
Not all USB 2.0 and USB 3.0 ports are physically connected to the board.
USB 3.0 ports are backward compatible with USB 2.0.
The following USB connectors are available in the I/O area of the connector panel:
USB 2.0/3.0 Ports 1, 2, are supplied on the combined 2 x USB and LAN connectors (J21)
USB 2.0 Ports 3, 4 are supplied on the combined 2x USB and LAN connector (J5)
Figure 9: USB 2.0 / USB 3.0 sockets
USB 2.0
USB3.0
7.3.1.
USB Port 1 and USB Port 2 (J21)
USB port 1 and 2 supports USB 3.0/USB 2.0 and are located on the stacked USB/LAN connector J21.
Table 7: Pin Assignment USB Port 1 and USB Port 2 (J21)
Pin
Signal
Type
Note
Top
18
Tx3+
IO
USB 3.0 Tx. Differential Pair (+)
17
TX3-
IO
USB 3.0 Tx. Differential Pair (-)
16
GND
PWR
15
RX3+
IO
USB 3.0 Rx. Differential Pair (+)
14
RX3-
IO
USB 3.0 Rx. Differential Pair (-)
13
GND-
PWR
12
D3+
IO
USB 2.0 Differential Pair (+)
11
D3-
IO
USB 2.0 Differential Pair (-)
10
VBus
PWR
+5 V Supply for USB device
Bottom
9
Tx2+
IO
USB 3.0 Tx. Differential Pair (+)
8
TX2-
IO
USB 3.0 Tx. Differential Pair (-)
7
GND
PWR
6
RX2+
IO
USB 3.0 Rx. Differential Pair (+)
5
RX2-
IO
USB 3.0 Rx. Differential Pair (-)
4
GND-
PWR
3
D2+
IO
USB 2.0 Differential Pair (+)
2
D2-
IO
USB 2.0 Differential Pair (-)
1
VBus
PWR
+5 V Supply for USB device
