Behavioral verilog: creating multiple muxes with 1 module

Question

If I have a module defined like this:

module mux_1x2(in, out, select);

and I need 32 of them, I know that using structural coding I can do:

mux_1x2 mux01(in[0], out[0], select);
mux_1s2 mux02(in[1], out[1], select); 
etc...

But how can I use behavioral programming to make 32 of these in some sort of loop without having to explicitly define each one?

edit: Just for context, I'm trying to make a 2-stage 64-bit carry-select adder

Answer 1

You can use a generate block: (IEEE1364-2001 and above)

genvar gidx;
generate
  for(gidx=0; gidx<32; gidx=gidx+1) begin : loop
    mux_1x2 mux(in[gidx], out[gidx], select);
  end
endgenerate

Or array the instance: (IEEE1364-1995 and above)

mux_1x2 mux[0:31] ( .in(in) , .out(out) , .select(select)  );

Or parameterize:

module mux_1x2 #(parameter WIDTH=1) (input [WIDTH-1:0] in, output [WIDTH-1:0] out, input select);
  // ...
endmodule
// ...
mux_1x2 #(32) mux ( .in(in) , .out(out) , .select(select) );