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there is some already designed USB 2.0 IP's for free on the internet .. I know that of ASICs.ws .. designed by Rudolf Usselmann .. he has a website for himself called : www.asics.ws .. and he is hosting the Verilog IP itself on opencores under this link :
**broken link removed**
refer to this IP, maybe the documentation can be benfitial for u .. and the code too .. you need also to see the USB 2.0 standard document.