11.10. Multi-master Operation

The AMBA bus specification supports multiple bus masters on the high performance Advanced System Bus (ASB). A simple two wire request/grant mechanism is implemented between the arbiter and each bus master. The arbiter ensures that only one bus master is active on the bus and also ensures that when no masters are requesting the bus, a default master is granted.

The specification also supports a shared lock signal. This allows bus masters to indicate that the current transfer is indivisible from the following transfer and prevents other bus masters from gaining access to the bus until the locked transfers have completed.

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