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non-implemented commands


Hello..
A quick question about non-implemented commands. When I get
one, should I go to BusBusy state or Backoff state? In other words, if
there is a I/O Read  on the bus (and I don't implement
it), but the address falls into my I/O space, do I drive DEVSEL to 0 and
"deassert TRDY/assert STOP" or do I go to BusBusy state and drive Z on
Devsel/Trdy/Stop? 

Thanks for your time
Anand


ÈhW