Don's post is here.
Tip for searching this site: Ignore the site's search function, which is useless. Use a major search engine.
EDIT: Below is the link (becasue the hyperlink function here still doesn't work right
http://cs.finescale.com/fsm/tools_techniques_and_reference_materials/f/18/t/146050.aspx
...and even that won't post as a hyperlink. I'm about ready to give it up.