Re: [usb] Clarification on USB

["Vishal Namshikar" <vishaln@controlnet.co.in>]

Suppose the babbling device is connected to hub which in turn is connected
to root hub, then the hub port is disabled or the root hub port is disabled?

----- Original Message -----
From: "Marc Reinig" <mreinig@pacbell.net>
To: <usb@opencores.org>
Sent: Wednesday, March 05, 2003 8:23 PM
Subject: RE: [usb] Clarification on USB


> The contention is avoided by only have devices that work plugged in to the
> USB.  Certainly a device that does not adhere to the turn around time spec
> is not a working device.
>
> The contention is controlled by the host shutting off the port that the
> device is connected to and not talking to the device any more, if this
> occurs more than a few times.
>
> Marc Reinig
> System Solutions
>
>
> > -----Original Message-----
> > From: owner-usb@opencores.org [mailto:owner-usb@opencores.org]On Behalf
> > Of Ravi Kumar
> > Sent: Tuesday, March 04, 2003 10:41 PM
> > To: usb@opencores.org
> > Subject: [usb] Clarification on USB
> >
> >
> > Hi Folks
> >
> > I have  a Query on Usb.
> > suppose host puts IN token and send it  to device .
> > 2.Device takes more than the Bus turn around Time ( or
> > more than the bit times required to respond )
> > 3.Host wil assume itz the Bus time out and intimate to
> > software.
> > 4.Assuming this the host wil retry to the same Device
> > .
> > 5.By that time whn Device responds for the previous IN
> > token it wil lead to Contention
> >
> >
> >
> > How the above said Contention is avoided or
> > controlled.
>
>
>
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