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Basic bus: Multiple Initiators (II).

Basic bus, but now with two initiating devices.

Needs arbitration between initiators: static priority, round robin, etc..

The maximum bus throughput of unity is now shared among initiators.

Owing to contention, need acknowledge signals for each request and each operation (not shown).

How long to hold bus before re-arbitration ? Commonly re-arbitrate after every burst.

51: (C) 2008-13, DJ Greaves, University of Cambridge, Computer Laboratory.