mITX-BW – User Guide, Rev. 1.6
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6.3.
USB Connectors /IO Area (J21 & J23).
The mITX-BW board contains a XHCI (Extensible Host Controller Interface).
The XHCI controller supports up to four USB 3.0 ports allowing data transfers up to 5Gb/s. Four of the USB 3.0 ports
are shared with four of the USB 2.0 ports (USB0 – USB3).
Note: Not all USB 2.0 and USB 3.0 ports are physically connected to the board.
Legacy Keyboard/Mouse and wakeup from sleep states are supported. Over-current detection on all USB ports is
supported.
The following USB connectors are available in the IO Area.
USB 2.0/3.0 Ports 0, 1, 2, 3 are supplied on the dual USB connectors in the IO Area (J21 & J23).
USB 2.0 Ports 5, 6 are supplied on the combined Front Panel connector (J4).
USB 2.0 Port 4 is available in the mPCIe connector (J35).
Enhanced Host Controlled Interface (EHCI) is not supported by the mITX-BW Board. The
mITX-BW board only support XHCI.
Figure 10: USB 2.0 / 3.0 socket J21, J23
USB 2.0
USB3.0
Table 14: Pin Assignment J21, J23
Pin
Type
Signal
Note
1
PWR
5 V / SB 5 V
USB2.0 / 3.0
2
IO
USB 3-
USB2.0 / 3.0
3
IO
USB 3+
USB2.0 / 3.0
4
PWR
GND
USB2.0 / 3.0
5
IO
RX 2-
USB3.0
6
IO
RX 2+
USB3.0
7
PWR
GND
USB3.0
8
IO
TX 2-
USB3.0
9
IO
TX 2+
USB3.0
Table 15: Signal description
Signal
Description
USBn+ USBn-
RXn+ RXn-
TXn+ TXn-
Differential pair works as serial differential receive/transmit data lines.
(n= 0,1,2,3)
5 V / SB5 V
5 V supply for external devices.
SB5 V is supplied during power-down to allow wakeup on USB device activity.
Protected by resettable 2A fuse covering both USB ports.
1
2
3
4
1
2
3
4
9
8
7
6
5
