Usb Connectors /Io Area (J21 & J23); Table 14: Pin Assignment J21, J23; Table 15: Signal Description; Table 18: Signal Description - Kontron mITX-BW User Manual

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

Table 14: Pin Assignment J21, J23

Pin Type Signal
1 PWR 5 V / SB 5 V
2 IO USB 3-
3 IO USB 3+
4 PWR GND
5 IO RX 2-
6 IO RX 2+
7
PWR GND
8
IO TX 2-
9 IO TX 2+

Table 15: Signal description

Signal Description
USBn+ USBn- Differential pair works as serial differential receive/transmit data lines.
(n= 0,1,2,3)
RXn+ RXn-
TXn+ TXn-
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
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mITX-BW – User Guide, Rev. 1.6
1 2 3 4
9 8 7 6 5
Note
USB2.0 / 3.0
USB2.0 / 3.0
USB2.0 / 3.0
USB2.0 / 3.0
USB3.0
USB3.0
USB3.0
USB3.0
USB3.0
USB3.0
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