RE: [usb] Clarification on USB

[Marc Reinig <mreinig@pacbell.net>]

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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