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AWR2944: HWA Dummy paramsets in DDMA processing chain

Part Number: AWR2944

Hi Experts

There are several dummy HWA paramsets in DDMA doppler processing stage.  Hope its functionality could be better explained.

I get below pic from  file:///C:/ti/mmwave_mcuplus_sdk_04_04_00_01/mmwave_mcuplus_sdk_04_04_00_01/ti/datapath/dpu/dopplerprocDDMA/docs/doxygen/html/index.html

Could you pls help with below confusion?

Dummy paramset trigger type is EDMA , Azim FFT paramset trigger type is immediate.

EDMA DopplerFFT DATA in signature channel triggers dummy paramset. Why does it not trigger Azim FFT directly?  

Thanks

Ken