TUSB321: solution with USB3.1 controller

daron ng

Part Number: TUSB321

My target is to make my USB3.1 controller capable as DRP and keep the OTG feature for legacy USB2.0 with Type-C interface.

I’m facing some doubts and would like to seek for your guidance on some sideband signals between USB3.1 Controller and peripheral devices for Type-C solution.

I found my USB3.1 controller has no I2C interface as well as no USB_ID input pin.

And per USB Type-C standard, the Channel Configuration, CC controller(TUSB321) is managing the role configure and detection on the device connecting to Type-C.

Therefore, there is typically an ID port from CC controller to give a logic output indicates the device attachment is DFP or UFP.

My question is, how USB3.1 controller identify whether it is a DFP or UFP connecting to it?

Without I2C and ID port on my USB3.1 controller, any other way done for role detection handshake? via ULPI or PIPE?

Below is my solution diagram, can you please tell me will it works?

over 2 years ago

0 Brian Zhou over 2 years ago

TI__Guru*** 145550 points

if configured as DFP, it turn on Rp. ID is high until UFP is attached successfully. ID is used to turn on vbus switch to turn on Vbus

For UFP, Rd is presented on CC line, ID is always high, it waiting Vbus from Vbus_dect for successful detecttion.. It's nothing do to with ulpi or PIPE.

Your schematic should work.

0 daron ng over 2 years ago in reply to Brian Zhou

Prodigy 30 points

Thank you for your response.

Yes, I know how is the CC controller's ID reacts based on the DFP/UFP attaching on port.

But my question is how the "USB3.1 Controller (config as DRP)" to detect whether is DFP or UFP connects on port, so my USB3.1 controller can react accordingly to become UFP or DFP.

Above mentioned condition is assuming no I2C or ID pin connecting from CC controller to my USB3.1 controller.

0 Brian Zhou over 2 years ago in reply to daron ng

TI__Guru*** 145550 points

For DRP, when CC line sees Rp, it becomes UFP or if sees Rd on CC line, it configured as DFP.

If DRP to DRP, it depends. the one whose Rp on the CC line first, it will be configured as DFP, the other one configured as UFP.

Regards

Brian

+1 daron ng over 2 years ago in reply to Brian Zhou

Prodigy 30 points

I'm using TUSB321 and it has no I2C interface. Can you elaborate more what signals are included in GPIO between USB Controller vs CC Controller ?

+1 Brian Zhou over 2 years ago in reply to daron ng

TI__Guru*** 145550 points

GPIO pins are PORT,ID,DIR,CURRENT_mode, OUT pins, VCONN_Fault.

Regards

brian

0 daron ng over 2 years ago in reply to Brian Zhou

Prodigy 30 points

Thanks for your answers.

Can you also provide me a timing diagram on how ID reacts corresponding to the PORT setting in different roles (e.g. DRP, DFP & UFP) along with "Unattached" and "Active" modes?

And what is the time delay between CC detection till ID to toggle?