TUSB7320 interface with USB 2.0 standard A socket

Robert Heimbueger

The TUSB73x0 is a USB 3.0 capable device. I wish to connect the USB port interface using a USB 2.0 standard A receptacle. (I'm not connecting the super speed pairs to anything.)

I expect a USB 2.0 device to operate fine. However, what would happen if a USB 3.0 device is plugged in? Since the controller capability defaults to 3.0 will the communications resolve to 2.0 or just fail? Is there a way to dummy down the capability of the TUSB73x0 to 2.0?

over 11 years ago

0 Diego Cortes over 11 years ago

TI__Mastermind 36085 points

Hello Robert,

The TUSB73x0 is backward compatible with USB2 and therefore with your configuration, the HOST always will be enumerating USB2 devices, regardless if the device is USB3 or USB2.

Regards,

Diego.

0 Robert Heimbueger over 11 years ago in reply to Diego Cortes

Prodigy 40 points

Thank You Diego,

So if the cable connecting a USB 3.0 device to a USB 3.0 receptacle is only USB 2.0 (no super speed pairs) then the controller enumerates as 2.0 capability. Communications work just fine at USB 2.0 speed. (Same question, different scenario).

Just double checking,

Bob

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TUSB7320 interface with USB 2.0 standard A socket