continuous averaging using VHDL

I updated the previous post. I am posting it again.

@kaz

Yes I mean to concatenate them. I have two ADCs. Each ADC has two 12 bit inputs that captures the value. One ADC is for current measurement and the other for voltage measurement. The voltage measurement ADC is fine and I don't need filter for that. I need the filter for current measurement ADC. I concatenate the four outputs (two from first ADC and two outputs from second ADC) into 48 bits. I am doing the 'and' or concatenate on the top level. Then I am passing the concatenated value to the GUI via USB interface. These 48 bits value represents the Current and voltage.