On Tuesday 24 May 2011 23:48:30 Daniel O'Connor wrote:
> I find that my application has rare problems where it does not get a reply
> from the micro to a control bus packet, or perhaps the micro doesn't
> receive it (I need to add a sequence number or similar to my protocol to
> try and detect it I think).

There was a data toggle issue fixed with the EHCI recently, which triggers 
depending on hardware timing. Are you running the latest 8-stable or 9-
current. There is also a new utility called usbdump, which can be used to 
figure out what is going on.

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