Usb - Cherry RINGNECK SOM-PX30-uQ7 User Manual

12.6 USB

The RINGNECK SOM-PX30-uQ7 CPU has 2 USB 2.0 controllers. A USB 2.0 hub provides two additional USB 2.0
ports for a total of four.
The routing of Qseven signals to CPU and/or hub port is shown below.
Qseven Port #
USB_P0
USB_P1
USB_P2
USB_P3
The lsusb -t command shows the USB topology in a tree view and is highly recommended. Its output is dis-
cussed below, for a RINGNECK SOM-PX30-uQ7 module without additional devices connected:
- Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ohci-platform/1p, 12M
- Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-platform/1p, 480M
* Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
Port 1: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 480M
Port 3: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 480M
Port 4: Dev 6, If 0, Class=Vendor Specific Class, Driver=ucan, 12M
- Bus 01.Port 1: Dev 1, Class=root hub, Driver=dwc2 1p, 480M
The CAN controller is connected to Port 4 on the hub.
The USB hub can be held in reset, if required. This disables all USB ports connected to the hub. The reset
signal routing is shown below:
v1.3.1
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Speed
USB 2.0 Hi-Speed
USB 2.0 Hi-Speed
USB 2.0 Hi-Speed
USB 2.0 Hi-Speed
Hub signal CPU Pin
USBHUB_RESETn GPIO0_A5
Connected to Notes
Hub
CPU OTG Port
Hub
Hub
Linux GPIO #
5