Re: Merged version of chapter 6

From: Ken Kundert <ken_at_.....>
Date: Fri Jun 16 2006 - 09:15:17 PDT
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Geoffrey,
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    I also went back through all the LRMs and was surprised that nowhere
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was the disabling feature described. And was further surprised when Marq
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reported that even the Cadence simulators do not support the feature
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because I remember using this feature on occasion. I was so confident of
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this that I described this feature in my book. I imagine what happened
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is that we forgot to describe this feature in the original versions of
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the LRM, and during some clean up of the LRM someone who was unfamiliar
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with the feature added the restriction that the direction must either be
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+1, -1, 0, or unspecified, and that later someone at Cadence saw this
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new restriction and removed the feature from Spectre & AMS Designer.
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However, that is all beside the point now. The question remains: how do
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we provide an easy and efficient way to disable cross. There seems to be
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two choices. Either use the direction indicator or add an additional
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argument. My preference is to use the direction indicator, but it is not
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a strong preference.
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-Ken
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Geoffrey.Coram wrote:
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> Ken -
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> In LRM 2.2, top of page 122 in section 6.7.5.1, I see the sentence:
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>   The direction indicator can only evaluate to +1, -1, or 0.
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> 
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> This sentence is in LRM 2.0, but not in the "Verilog-A LRM 1.0"
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> All the LRMs have this sentence:
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>   For any other transitions of the signal, the cross function
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>   does not generate an event.
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> (meaning no event for a positive transition when the direction
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> indicator is -1).  I don't see anywhere the intent that you 
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> mention.
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> 
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> -Geoffrey
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> 
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> 
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> Ken Kundert wrote:
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>> Sri,
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>>     Hmmm. I was the one that originally defined the behavior of the
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>> cross function, and it was definitely the intent that the function be
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>> disabled when a value other that +1, -1, or 0 was provided for the
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>> direction.
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Content-Type: text/x-vcard; charset=utf-8;
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 name="ken.vcf"
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 filename="ken.vcf"
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begin:vcard
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fn:Ken Kundert
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n:Kundert;Ken
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adr:;;101 First Street #150;Los Altos;CA;94022;USA
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email;internet:ken@designers-guide.com
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tel;work:+1-650-968-8291
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x-mozilla-html:FALSE
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url:http://www.designers-guide.com/home.html
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version:2.1
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end:vcard
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Received on Fri Jun 16 09:15:24 2006

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