Re: [usb] Clarification on USB

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

Hi Marc,
If this is the case then Hub will be responsible for disabling the port,
right? Does the hub block upstream traffic after timeout period expires?
If answer to first question is "No" then how does the host controller know
which device on hub is responsible for babble?
If the hub doesnot block upstream traffic then how does the host controller
know whether its a  device on hub that is responsible for babble and not the
hub?
--vishaln


----- Original Message -----
From: "Marc Reinig" <mreinig@pacbell.net>
To: <usb@opencores.org>
Sent: Thursday, March 06, 2003 8:49 PM
Subject: RE: [usb] Clarification on USB


> 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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