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Address Conflict. We use the term address conflict to describe a bus error that
results when interfaces are misconfigured so they respond to the same address. Most
bus protocols include a test for address conflicts — if two or more interfaces attempt to
respond to a given request, the bus hardware detects the problem, and sets a control line
to indicate that an error occurred. When it uses a bus, the processor hardware checks
the control lines to determine whether an error occurred, and if so, reports the error.
Unassigned Address. An unassigned address bus error occurs if a processor attempts
to access an address that has not been configured into any interface. To detect
an unassigned address, most bus protocols use a timeout mechanism — after sending a
request over the bus, the processor starts a timer. If no interface responds, the timer expires,
which causes the processor hardware to report the bus error
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