Hello Ted, Intel PSG does not own this IP and unfortunately we do not have any demo design that we can share. The IP was developed by our partner SLS. You can check the detail at this link, which include the contact info to SLS office in USA and India.
I believe the best option is to consult with SLS if they have any demo design they can share with customer.
This is Pritesh from SLS. We do have USB3 IP core Demo available. Also we do provide one month evaluation license of USB3 Device IP core at no cost. You can request it from https://www.slscorp.com/licensing/ip-licensing.html
The evaluation package contains encrypted IP with one month evaluation license, ready to use reference design, Demonstration files, Technical documents, HAL drivers to make user comfortable.
You can also contact me at firstname.lastname@example.org or write here.