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How work Circular Buffering DMA?

Question asked by bookevg on Aug 12, 2011
Latest reply on Aug 16, 2011 by bookevg

I tried to learn all datasheets:

SHARC Processor Programming Reference (includes the ADSP-2136x/ADSP-2137x/ADSP-214xx processors), Rev. 2.2, March 2011

ADSP-214xx SHARC Processor Hardware Reference, Rev. 0.3, July 2010

but I found nothing how Circular Buffering DMA work especially for external Port.

It's not good for AD

How I can developed my software if I can't understood how to work ADSP21489?