module demux_1x128 (in,sel,out);
input in;
input [6:0] sel;
output [127:0] out;
wire [1:0] out_w;

demux_1x2 d128_0(.in(in),.sel(sel[6]),.out(out_w[1:0]));
demux_1x64 d128_1(.in(out_w[0]),.sel(sel[5:0]),.out(out[63:0]));
demux_1x64 d128_2(.in(out_w[1]),.sel(sel[5:0]),.out(out[127:64]));

endmodule