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这个是第三方的IP，需要NDA。在TRM文档有说明。
This document serves to describe the integration of this third-party USB subsystem and should not be considered sufficient for those wishing to modify the existing Linux USB driver(s) or create a new driver to support this controller implementation. For those who do wish to substantially modify the existing Linux USB driver(s), or create new drivers, contact your TI sales representative for more information on how to obtain the third-party IP databook under NDA. www.ti.com/.../spruhl7h.pdf
