module mux4to1(s0,s1,in0,in1,in2,in3,out);
input s0,s1;
input in0,in1,in2,in3;
output out;
function mymux;
input sel0,sel1;
input x0,x1,x2,x3;
begin
if (sel1) if (sel0) mymux=x3;
else mymux=x2;
else if(sel0) mymux=x1;
else mymux=x0;
end
endfunction
assign out=mymux(s,in0,in1,in2,in3);
endmodule
function文