TUSB320 non-standard USB-C configuration

Shing Ho

Other Parts Discussed in Thread: TUSB320

I would like to operate the TUSB320 in a non-standard configuration. Where two custom modules are connected by USB type-C cable.

Where DFP sources the VBUS but it's data interface is the device side, and UFP is the VBUS sink but is the data interface host. Enclosed is diagram of the configuration.

Is this a legal configuration? Can the TUSB320 be configured in such a manner? I don't see why it can't but just not sure if it would cause any USB 3 type C and USB 2.0 issue. We are only using the USB 2.0 DP/DN pins for data and not the SERDES links.

It is also possible for normal configuration of DFP, UFP and DRP are connected to the custom modules. I want to ensure that in these cases that no damage is caused to the custom modules.

Enclosed is a diagram of the configuration.

USB-C_config_diagram.pdf

Thanks.

Shing....

over 9 years ago

0 Diego Cortes over 9 years ago

TI__Mastermind 36085 points

Hello Shing,

First of all, this configuration it is not allowed by the USB specification and your host/device won't be compatible with any other USB device/host. It is possible to configure the TUSB320 as you want it, since the USB2 will be handled independently, you only have to figure out how to detect the connection event for the USB3 Host and device.

We do not recommend to use such configuration.

Regards,
Diego.

0 Shing Ho over 9 years ago in reply to Diego Cortes

Prodigy 20 points

Thanks Diego

What if I only want to connect to USB 2.0 interfaces only not USB3? Will it still work?

Do you have any recommendations?

Thanks.
Shing...

0 Diego Cortes over 9 years ago in reply to Shing Ho

TI__Mastermind 36085 points

Shing,

Still it won't be compatible with other devices and my recommendation is to follow the spec.

Regards,
Diego.

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TUSB320 non-standard USB-C configuration