IWR1642: Why did the transfer between ADC buffer and adcDataIn buffer need a ping-pong operation in MMW in SDK1.1?

hi, 

In MMW demo in SDK1.1, the data transfer from ADC buffer to adcDataIn is operated by a ping-pong EDMA. 

I do not quite understand this operation, and I assume this is because data output after windowing will be sent back to adcDataIn.

But what if a new buffer for windowing output rather than the ping-pong adcDataIn buffer, what is the difference on cycles?

I think this will save the ping-pong operation. Am I right?

Thanks!