From: Yehuda D. Yizraeli ([email protected])
Date: Tue Oct 26 1999 - 08:50:49 PDT
Hello D. C.,
Thanks for the quick answer. I looked at the spec and could not find
out whats the enlarge skew will cause to. Any idea OR any pointer to it..?
thanks in advance, yehuda
>
> "Yehuda D. Yizraeli" wrote:
> >
> > Hi,
> >
> > Just wondered if someone knows the nature of the requirement for
> > matching of the rise and fall slope time in the USB spec.
>
> Shalom Yehuda!
>
> The rise and fall times, as well as the crossover point, need to match
> for two reasons:
>
> 1) Receiver performance. Mismatch would take the receiver out of its
> best common-mode range and cause increased jitter. Thanks to SE0
> conditions USB can't require large receiver common-mode ranges.
> 2) EMI. Mismatches between the rise and fall, esp. in unshielded
> cables, result in large common-mode energies that radiate like crazy.
>
> --
> D. C. Sessions
> [email protected]
>
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>
>
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