title: How to check signal drive strength?
body: <p>How do we check the signal drive strength on wire? Is it possible?
  Normally, we can only check the logical value of a wire either <code>1</code> or <code>0</code> using conditional check <code>==</code> or triple equals <code>===</code>.
  But it doesn't tell us the strength, e.g. <code>pull</code>, <code>strong</code> or <code>weak</code> etc.</p>
  
  <p>So is there a way to check drive strength? For example, it would be used something like this:</p>
  
  <pre><code>wire a;
  //... your a assignment
  initial begin
  //...
  if (a &amp;&amp; is_weak1(a)) $display("a is weak 1");
  end
  </code></pre>