title: how to define N bus with width 32bit
body: <p>I wanted to define large number of bus with bus width 32bit.</p>
  
  <p>for example </p>
  
  <pre><code>input [31:0] a0, a1, a2, .... aN;
  input [31:0] b0, b1, b2, .... bN;
  output [31:0] c0, c1, c2, .... cN;
  
  c0 = a0 + b0;
  c1 = a1 + b1;
  .
  .
  cN = aN + bN;
  </code></pre>
  
  <p>how can I realize this code with iteration?</p>