title: Program for drawing VHDL block diagrams?
body: <p>Is there any free program out there that can parse a collection of VHDL files and build a block diagram from them?</p>
  
  <p>I'm looking more for a program that will build a block diagram image to go along with the documentation for the hierarchy, similar to the way javadoc builds a class diagram after parsing the documentation for a series of classes.</p>