how to calculate the bustime for usb interrupt and isochronous transfers ?

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hi,
i just started writing a usb driver.(new bee!).so any one can please
advice me as to how to calculate,allocate bus timing(or bandwidth) for
interupt and isochronous transfers ? i referred linux src code.but i
cdnt understand the numbers in the bustiming calculation
function(usb_calc_bustime).

advanced thanx ,
Ramakrishnaprasad.A


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