Hi @Alex_SRL ,
Thanks for contacting NXP tech support! I am glad to provide service for you.
You can right, this doc indeed missing in SDK 2.14 and the latest version. At this point, I haven't gotten any inside information to confirm whether this was a mistake or was meant to be, and whether it will be put back in in the future.
But this USB Stack Device RM is basically unchanged, so please refer to the documentation in the previous SDK (SDK version 2.13.0). I apologize for any inconvenience this may cause. I'll let you know if there's any other news.
Best regards,
Gavin