I am curious to know why the FIR placement for tx & rx is placed at the interface level instead of near the DAC/ADC, before DAC and after ADC. What is purpose of placing the position there, is it to reduce anti-aliasing effect before up/downsampling to DAC/ADC rate? If so, wouldn't it be better to place them directly before DAC and after ADC.
The reason for asking is because I am unclear of the FIR intention based on its placement. Not sure whether I should bypass them or use them for my design porting. I am afraid if bypassing the FIR and design our own filters via PL resources, our signal performance might degrade.
Please kindly educate me on this part.