ARM Technical Support Knowledge Articles

General: Is a dummy master really necessary?

Applies to: AHB

Answer

A dummy master is necessary in any system which has a slave that can give SPLIT transfer responses. The dummy master is required so that something can be granted the bus if all the other masters have received a SPLIT response.

No logic is required for the dummy master and it can be implemented by simply tying off the inputs to the master address/control multiplexer for the dummy master position. The requirements for a dummy master are that HTRANS is driven to IDLE, HLOCK is driven low, and all other master outputs are driven to legal values.

See also:

Article last edited on: 2014-02-06 14:47:20

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