Am Mittwoch, 30. Juni 2004 01:57 schrieb David Brownell:
> Alan Stern wrote:
>
> > Come to think of it, there really is almost no difference between an
> > unsolicited device reset and a power-off suspend (except that one is
> > quicker than the other). No difference at all as far as anything in the
> > USB stack is concerned, it seems to me.
>
> Actually there is a difference. One retains VBUS power, and the
> other one doesn't -- it's pretty significant, actually.
>
> For example, a bus-powered device would lose its firmware updates
> when VBUS is lost, and need much more re-initialization (commonly
> a couple more enumerations in addition to one or more firmware
> updates) before it can even get to the same "device reset" stage.
That is not a fundamental difference. The reset logic also has a device
morphed code path.
Regards
Oliver
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