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IWRL6432BOOST: Query for numRangeBins formula

Part Number: IWRL6432BOOST

Tool/software:

Hi,
I am using the IWRL6432BOOST ES2.0 board with LSDK 5.5.3.

I noticed that numRangeBins is defined as shown below:

gMmwMssMCB.numRangeBins = mathUtils_pow2roundup(gMmwMssMCB.profileComCfg.h_NumOfAdcSamples) / 2; // Real-only sampling

Reference:
C:\ti\MMWAVE_L_SDK_05_05_03_00\examples\mmw_demo\motion_and_presence_detection\source\motion_detect.c

However, in general, I have not seen this division by 2 applied.

Can you confirm if this equation is correct? Also, is this behavior documented somewhere?