TUSB9261-Q1: only USB3 connected and USB2 unconnected ?

Dawiid71!

Part Number: TUSB9261-Q1
Other Parts Discussed in Thread: TUSB9261

Hi Ti,

I use the TUSB9261 with a Nvidia jetson nano.

I would like to know if it's possible to use only TUSB9261 with connected USB3 without USB2 connected ?

I have a problem with this configuration because my jetson nano discover TUSB9261 with only connected USB2 and not with only connected USB3. ( connection between USB2 to USB2 and USB3 to USB3 is OK ).

Could you confirm me that works with USB3 only connected ?

Best regards

over 4 years ago

0 Brian Zhou over 4 years ago

TI__Guru*** 146515 points

Hi:

Do you mean only connect USB3 on PCB and leave USB2 float?

Regards,

Brian

0 Dawiid71! over 4 years ago in reply to Brian Zhou

Prodigy 20 points

Hi Brian,

Yes, only USB3 is connected and USB2 floating.

Regards

David

0 Brian Zhou over 4 years ago in reply to Dawiid71!

TI__Guru*** 146515 points

David:

It will work, but only for USB3.

Regards,

Brian

0 Dawiid71! over 4 years ago in reply to Brian Zhou

Prodigy 20 points

Hello Brian,

it didn't work with only USB3. I had to wire USB2.

the firmware is TUSB926x_Firmware_v1.05.

I don't understand.

Regards

David

0 Brian Zhou over 4 years ago in reply to Dawiid71!

TI__Guru*** 146515 points

David:

if you connect both USB2 and USB3 on PCB, both USB2 and USB3 works fine?

Regards,

brian

0 Brian Zhou over 4 years ago in reply to Brian Zhou

TI__Guru*** 146515 points

Any way, you need to connect both USb2 and USB3, otherwise it's not compliant to USB spec.

Regards,

Brian

0 JMMN over 4 years ago in reply to Dawiid71!

TI__Guru 60870 points

David,

Does the USB 3.0 connection not work if DP and DM are disconnected? VBUS is always required.

To be compliant to the USB specification, both USB 2.0 and USB 3.0 should be connected as Brian stated, but I would still expect the TUSB9261 to work at USB 3.0 if DP and DM are not connected.

Regards,

JMMN

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TUSB9261-Q1: only USB3 connected and USB2 unconnected ?