Porting SAM7s USB code to SAM9263 board

When I am porting SAM7S USB example program to SAM9263 board, USBCK is not setting to 48MHZ,
and status register shows PLLB locked. How will i configure PLLB?
what are the settings has to be done to use SAM7S Massstorage program runin SAM9263 board.
Or is there any USB example program runs on SAM9263 board.

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