TPS65982/6 - USB 2.0 data multiplexer

Hi,

Are you asking how the FW controls the HS Mux or are you asking about the signal integrity of the multiplexer (such as an eye diagram)?

Regards,
Karl

Hi Karl,

Thanks, I'm asking why the internal USB2.0 data Multiplexer seems not working in my test case.

I use the TPS65982-EVM as the USB-C Host/Provider, running default firmware/configuration, set at mode ID 6. In order to test USB 2.0 communication, without a real PC supporting USB-C host, I take out the USB_RP_P and USB_RP_N pins, connect them to a normal USB 2 plug. According to the datasheet, it should work that way, right?
The other one is my TPS65986 board, as Device/Consumer, running my custom configuration (sink 5V or 12V, with USB 2.0 data enable). USB data lines connected to an Embedded Linux CPU.

To summary, data stream looks like below:
[PC USB2.0 host] <<== D+/D- ==>> [TPS65982-EVM ] <<== USB-C-to-C cable ==>> [TPS65986 <= D+/D- => Linux CPU]
As for the power:
[20V DC Power adaptor] >>==>> [TPS65982-EVM ] >>== USB-C-to-C cable ==>> [TPS65986 <= D+/D- => Linux CPU]

Power PD does work, my customer board can sink 5V or 12V without any problem. Just that there's nothing appear on the USB_RP_P/N lines when plug into PC.

Any suggestion for me? Thank you so much.