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.   

I am testing a loopback using a pair of DMAs and a McBSP (internal loopback in the McBSP), and
notice the elements are shifted in reception.  The TX side is verified against a scope and it
is fine.  (the McBSP uses a 1-bit delay in both TX and RX)
Furhtermore,  I even observe one TX transfer to be slip as well when two McBSPs are used (I'm
actually using 2 McBSP, 4 DMA, and 4 ping-pong buffer pairs.  The DMA transposes 32 elements by
32 frames).

I tested this on an EVM and it works to no surprise, but obviously I had to used the internal
sample rate generator a synchronization source.

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