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AWR1243BOOST: AWR1243BOOST

Part Number: AWR1243BOOST

Hello,

I see in the datasheet of AWR1xxx Data Path -SWRA555 in  page  26,

The questions is below:

1. what is the data transmission format ? Is big-endian(sent the 15th bit first) or little-endian(sent the 0th bit first)?

2. I see the ADC resolution is 12bit, and I see the low 4 bit have some special  functions in the red box in the picture above, it marked: b3-enable ,b2:0-Half word select(0-7), 

 can you explain what it means.

thanks very much.