ARM Technical Support Knowledge Articles

Does the AHB Arbiter require address lines as input?

Applies to: AHB

Scenario

In AMBA specification v2.0, fig 3-31 of the AHB arbiter shows address lines as input to the arbiter. Why does the arbiter require address lines? Should these address lines be from all masters or the from the master which has been granted bus access?

Answer

The address lines are just from the master which has been granted bus access. However, there is no compulsion for the arbiter to use these address signals; they are provided for your convenience. If you can think of an arbitration scheme that can make use of the address signals then you may implement them.

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