NetNews Usenet Archive 1993 #3/NN_1993_3.iso/spool/comp/cad/cadence/603

Text File | 1993-01-28 | 1.9 KB | 46 lines

Newsgroups: comp.cad.cadence
Path: sparky!uunet!ftpbox!news.acns.nwu.edu!zaphod.mps.ohio-state.edu!caen!uwm.edu!cs.utexas.edu!torn!news.ccs.queensu.ca!venus!pas
From: [e-mail] (Peter Stokes)
Subject: Re: Edge2.1: How to convert voltage waveforms to logic waveforms?
Message-ID: <[e-mail]>
Sender: [e-mail] (News Administrator)
Nntp-Posting-Host: jupiter
Reply-To: [e-mail]
Organization: Canadian Microelectronics Corporation
References:  <dfs.728063981@kehleyr>
Date: Wed, 27 Jan 1993 20:45:45 GMT
Lines: 32

In article <dfs.728063981@kehleyr>, [e-mail] (David F. Skoll) writes:
|> I have an 8-by-10 digital multiplier which I'm simulating using Hspice.
|> (!).  The problem is that I cannot look at the "logical" bus outputs,
|> because they are of type VOLTS, and Edge's waveform display won't let
|> me group them as a bus.  Is there any way I can somehow specify ranges
|> for Voh and Vol and convert Hspice's voltage output to a LOGIC type?
|> David F. SKoll

David,

I don't know the answer to your question but the
following MIGHT lead to a solution.   Essentially,
if you use STL to specify the circuit stimulus and
perform a simdiff, the resulting si.log file will
output lines like:

*Mismatch*  out       at time 9.9e-08 -  expected (voh)  simulated (2048)

There is a line in my STL source that reads

; specify voltage windows to define a input/outputs highs and lows
deflevel cmos vil=0.0 vih=5.0 vol=0.0 voh=5.0

I haven't pursued this but with some magic, you
might be able to get a table of voh/vol's.

Peter

Peter A. Stokes ___________________________________ Voice: [phone]
Engineering Applications Support                      Fax: [phone]
Canadian Microelectronics Corporation        Email: [e-mail]
Kingston, Ontario, Canada _______________________________________________