[PCB_FORUM] Re: linewidth change
- From: "westfeldt" <westfeldt_nbcd@xxxxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Thu, 9 Sep 2004 13:02:55 -0600
well you are right. my v14.2 does that now too. I could have sworn it used
to work different. losing it, I guess.
-----Original Message-----
From: Larry Briski [mailto:lgb@xxxxxxx]
Sent: Thursday, September 09, 2004 12:00 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: linewidth change
Patricki
I'm still in 14.2. The line width action you describe occurs in 14.2 also.
I've seen it in previous versions of Allegro too.
Larry
westfeldt wrote:
> Thank you David, but that was not it. It was unset, but setting it
> had no effect.
>
> Further details. This effect does not occur if I start route with
> some specified width and change layers. It only occurs when I start
> routing on an existing trace so that this existing width is my routing
width.
> When I drop the via, it reverts to the default drc trace width.
>
> ----------------------------------------------------------------------
> --
> From: David Greig [mailto:David@xxxxxxxxxxxxxx]
> Sent: Thursday, September 09, 2004 10:47 AM
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] Re: linewidth change
>
> Is the environment variable acon_no_impedance width unset? This would
> let the tool adjust line width to compensaye for impedances on each layer.
>
> I set it because I don't agree with the Allegro methodology for
> calculating impedance. Correct impedance calculations are easy enough
> to do (or you can resort to Method Of Moments 2D tools) Either will
> give more satisfactory results.
>
> Another reason for not letting the tool decide is if you want to
> identify controlled impedance routes by layer to the fab shop. Just
> make sure that your plane fill aperture is different from the
> controlled line width or the fab shop will have a harder time of it!
>
> Best Regards
>
> David Greig
> _________________________________________
> Director
> GigaDyne Ltd
> Buchan House
> Carnegie Campus
> Dunfermline KY11 8PL
> United Kingdom
> Tel. +44 (0) 1383 62 49 75
> _________________________________________
>
>
> ----------------------------------------------------------------------
> --
> From: westfeldt [mailto:westfeldt_nbcd@xxxxxxxxx]
> Sent: 09 September 2004 16:27
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] linewidth change
>
> Still getting used to v15.1. Sometimes tracewidth goes from my
> current width to minimum drc value when I drop a via; didn't do that
> in my v14.2. How do I fix this?
>
> Patrick Westfeldt, Jr.
> North Boulder Circuit Design
> westfeldt_nbcd@xxxxxxxxx
> 720-406-0887
> c 720-272-5822
>
>
> --
> Virus scanned by Lumison.
>
>
--
Lawrence Briski
SGI
Chippewa Falls, WI 54729
Phone: 715.726.7440
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