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DM8148 TRM: question on EDMAINTA/B for media controller interrupt Event

Hi,

My customer found EDMAINTA/B in Table 1-98. DSP INTC Interrupt Mapping of DM8148 TRM (SPRUGZ8 14 October 2011). They are explained as Region 4/5 DMA completion event.

What is it? We can not find more info about Region 4/5 DMA completion. Would you pls kindly explain more?