SBC Axel SBC/Interfaces and Connectors/USB ports

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History
Version Issue Date Notes
1.0.0 Oct 2020 First DESK release


USB ports[edit | edit source]

Description[edit | edit source]

SBCX provides two USB ports, one Host and one OTG:

  • J17 is a standard USB Host 2.0 Type A connector
USB Host connector


  • J18 is a micro-AB type receptacle for a USB OTG connection: this interface can operate in Host mode and Device (peripheral) mode


USB OTG connector

Signals[edit | edit source]

The following table describes the interface signals

USB Host[edit | edit source]

Pin# SOM Pin# Pin name Pin function Pin Notes
1 J10.188 USB_HOST_VBUS VBUS
2 J10.202 USB_HOST_DN USB Host Data -
3 J10.200 USB_HOST_DP USB Host Data +
4 - DGND Ground

USB OTG[edit | edit source]

Pin# SOM Pin# Pin name Pin function Pin Notes
6, 7, 8, 9 - USB_OTG_SH Shield
1 J10.186 USB_OTG_VBUS VBUS
2 J10.196 USB_OTG_DN USB OTG Data -
3 J10.198 USB_OTG_DP USB OTG Data +
4 J10.192 ENET_RX_ER USB OTG ID
5 - GND Ground

Device mapping[edit | edit source]

The USB Host port can be used under Linux for connecting USB peripheral devices: the related peripheral driver has to be integrated into the Linux kernel.

The USB OTG feature can be easily tested using the Mass Storage Gadget driver.