[usb] Clarification on USB

[Ravi Kumar <ravikumar_vlsi@yahoo.co.in>]

Hi Folks,
I have a clarification in USB.
Would some pls tell me how they arrive at 48 Mhz for
USB Clock.
I vaguely understand that itz due to considering some
.25% tolerence .
Pls explain me with some detail for two scenarios

1.If am operating for only low speed Devices, what is
the frequency of 
USB Clock required

2.1.If am operating for only High speed Devices, what
is the frequency of 
USB Clock required

Regards
Ravikumar

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