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ADSP - 21375 External DMA Scatter/Gather Example

Question asked by dmann on Mar 29, 2011
Latest reply on Dec 9, 2014 by Jithul_Janardhanan



I would like to make use of the external port DMA for an audio processing algorithms. I am using a custom board with an external 16MB SDRAM for delay line storage. Some of these algorithms would greatly benefit from having the DMA prefetch the delay line taps and post-write the delay-line inputs. From what I can tell, the ADSP-21375 has both Scatter/Gather and Circular Scatter/Gather capability. Does any examples programs that have this implemented? If not, could someone please provide the pseudo procedure for setting this up. At this point, I'm having many questions going off the hardware reference alone.