RE: [usb] Clarification on USB

[Marc Reinig <mreinig@pacbell.net>]

The port that is shut off is the port to which the device is directly
connected, i.e., the hub, not the root hub, unless it is connected directly
to the root hub.

Marc Reinig
System Solutions


> -----Original Message-----
> From: owner-usb@opencores.org [mailto:owner-usb@opencores.org]On Behalf
> Of Vishal Namshikar
> Sent: Wednesday, March 05, 2003 7:41 PM
> To: usb@opencores.org
> Subject: Re: [usb] Clarification on USB
>
>
> 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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