ARM Technical Support Knowledge Articles

When will the arbiter grant another master after a locked transfer?

Applies to: AHB

Answer

The arbiter will always grant the master an extra transfer at the end of a locked sequence, so the master is guaranteed to perform one transfer with the HMASTLOCK signal low at the end of the locked sequence. This coincides with the data phase of the last transfer in the locked sequence.

During this time the arbiter can change the HGRANT signals to a new bus master, but if the data phase of the last locked transfer receives either a SPLIT or RETRY response then the arbiter will drive the HGRANT signals to ensure that either the master performing the locked sequence remains granted on the bus for a RETRY response, or the Dummy master is granted the bus for the SPLIT response.

See also:

Article last edited on: 2014-02-06 13:05:39

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