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MCF54415 eDMA help

Question asked by Mark Wood on Nov 13, 2012
Latest reply on May 11, 2018 by TomE

I have a MCF54415 and have not been able to get the eDMA to operate. I probably have not configured it properly but the documentation has me confused. There are several references in the users's manual claiming that the eDMA has 64 channels. For example page 1-1 of MCF54415RM.pdf states "All MCF5441x devices operate at up to 250 MHz and include ... , a 64-channel DMA controller, ...". However page 19-2 states, "16-channel implementation". I know that some other coldfire devices use a multiplexer to map the 64 possible DMA sources to the 16 available controllers but there doesn't seem to be any DMA multiplexer identified in the documentation.

 

So my question is, is there a DMA multiplexer register that must be set to map a DMA request from, for example the DMA Timer, to the appropriate controller?

If there is not a multiplexer then doesn't it follow that the 64 possible DMA sources identified in table 19-6 is in error?

 

 

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