hdlbits-Popcount255

Popcount255

A "population count" circuit counts the number of '1's in an input vector. Build a population count circuit for a 255-bit input vector.

Hint

So many things to add... How about a for loop?

solution

module top_module( 
    input [254:0] in,
    output [7:0] out );
    always @(*) begin
        out = 0;
        for (integer i=0;i<255;i++) begin
            if (in[i]) out = out + 8'h01;
        end
    end
endmodule