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McBSP DMA sync

How does a DMA synchronize to the first element of the McBSP?  The McBSP
will send events to the DMA on every element transfer, but how does the DMA
synchronize to an EXTERNAL frame synch (and clock)?

Should the McBSP frame interrupt be used to start the McBSP
transmitter/reciever? Presently the DMA is started and subsequently the McBSP.
The McBSP is started irrespective of the external frame pulse.