module top #(
    parameter DATA_WIDTH = 32,
    parameter SUM_WIDTH  = 72
) (
    input wire signed [DATA_WIDTH-1:0] i_weight,
    input wire signed [DATA_WIDTH-1:0] i_activation,
    input wire signed [SUM_WIDTH-1:0]  i_sum,
    output wire signed [SUM_WIDTH-1:0] o_sum
);
    assign o_sum = (i_weight * i_activation) + i_sum;
endmodule