乘法器行为级

module mu(a,b,c);
  input [3:0] a,b;
  output [7:0] c;
  reg [7:0] c;
  reg [7:0]m,n;
  always@(*) begin
    c=8'd0;
    if(b[0])
      c=c+a;
    if(b[1])
      c=c+(a<<1);
    if(b[2])
      c=c+(a<<2);
      if(b[3])
        c=c+(a<<3);
      end
    endmodule
    
    
     module stimulus;
      reg [3:0] A,B;
      wire [7:0] C;
      mu m(A,B,C);
       initial
       begin
             A=4'd3;B=4'd4;
         #20 A=4'd7;B=4'd8;
         #20 A=4'd10;B=4'd6;
         #20 A=4'd11;B=4'd10;
         #20 A=4'd2;B=4'd2;