ARM Technical Support Knowledge Articles

Does PL022 support dynamic switching between master and slave?

Applies to: PL022 Synchronous Serial Interface

Answer

As the Technical Reference Manual states in section 2.3.15 "Examples of master and slave configurations", PL022 was never intended to be used in a system where it is dynamically switched between acting as a master and slave and, as such, has never been tested in such a situation.

You would have to ensure that all transactions had completed before reconfiguring the device, ensuring that the TX FIFOs had been completely emptied. Disabling or dynamically switching from Master to Slave will cause the internal state machine to transition to the RESET state.

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