Thanks for showing interest in USB 1.1 Device IP Core. This IP Core is now obsolete and upgraded to USB 1.1 Device, Software based Enumeration RAM Interface (USB11SR) with added functionality and software control. We recommend to use USB11SR IP Core instead of USB 1.1 Device IP Core. For any query, please contact This email address is being protected from spambots. You need JavaScript enabled to view it. .