Digital logic simulation questions

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Article #18058

#18058

From: John Gregor
Date: Sat, 19 Sep 1987 19:31

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I have been writing my own logic simulator (reinventing the wheel so that I
really grok it).  In doing some reading of available simulators (HILO, etc.)
I keep seeing several buzzwords that I would appreciate an explanation for.
The one that has me most confused is "12 state logic."  What are they talking
about?  Does it mean that any node can take on one of 12 states (Hi, Lo, Z, 
<unknown>, etc.)?  If not, what?  What does it get you in terms of performance,
accuracy, algorithms, etc?  Ideally, I would ask for pointers to technical
papers.  However, being in Germany (and not able to read the language) I would
prefer a good summary mailed to me.  I will post the answer if there is 
interest (or if people are still talking about mercury filled wires).

			Thanks
			    John Gregor

		johng%ecrcvax.UUCP@germany.cs.net
		 uunet!mcvax!unido!ecrcvax!johng

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Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!mcvax!unido!ecrcvax!johng
From: johng@ecrcvax.UUCP (John Gregor)
Newsgroups: sci.electronics
Subject: Digital logic simulation questions
Message-ID: <435@ecrcvax.UUCP>
Date: Sat, 19-Sep-87 15:31:23 EDT
Article-I.D.: ecrcvax.435
Posted: Sat Sep 19 15:31:23 1987
Date-Received: Sun, 20-Sep-87 20:02:35 EDT
Reply-To: johng@ecrcvax.UUCP (John Gregor)
Organization: ECRC, Munich 81, West Germany
Lines: 18
Keywords: simulation, digital, 12-state, no_mercury_filled_cables