ARM Technical Support Knowledge Articles

General: What is the difference between a dummy bus master and a default bus master?

Applies to: AHB

Answer

The term default bus master is used to describe the master that is granted when none of the masters in the system are requesting access to the bus. Usually the bus master which is most likely to request the bus is made the default master.

The dummy bus master is a master which only performs IDLE transfers. It is required in a system so the arbiter can grant a master which is guaranteed not to perform any real transfers. The two cases when the arbiter would need to do this are when a SPLIT response is given to a locked transfer and when a SPLIT response is given and all other masters have already been SPLIT.

See also:

Article last edited on: 2014-02-06 14:38:25

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