[PCB_FORUM] Re: manually fanning out from a pad
- From: "Hugh Allen" <hugh@xxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Wed, 9 Feb 2005 06:34:49 -0500
Hi Steve:
It is interesting that you remember this interactive (manual) feature of
Veribest -- an Auto router to most people.
Turns out that Specctra has interactive capabilities that address the same
sort of problems in a somewhat similar although not identical way.
You might find it helpful to check out its interactive capabilities as we
have found some things easier/faster one place (Allegro) and others another
place (Specctra). Specctra's edit command, if you double click for a via, it
shows the close by valid positions for a via, if there is a close by via
site.
You can set and control both a via grid and a wire (trace) grid if that is
useful or just use clearance requirements to control it (set grid very
small).
It does have its own peculiarities to get used to, however its COPY, move,
and edit functions can be excellent supplements to Allegro.
We sometimes export to specctra, open the dsn in Specctra, make sure the
right clearance rules are there from the rules.do file, then do the editing
we want, generate a .session file and import back into Allegro.
Hope this may be useful.
Hugh Allen
Specctra Specialist
CopperCad Design
www.coppercad.com
hugh@xxxxxxxxxxxxx
-----Original Message-----
From: steve kingdon [mailto:steve.kingdon@xxxxxxxxxxxxxxxxxxx]
Sent: Tuesday, February 08, 2005 2:36 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] manually fanning out from a pad
Hi there,
Say you are running a trace out from a pad, and you want the via to be
as close as possible to the pad. Is there any way to know, before you
drop the via, that you have gone out far enough so that you will not
cause a via-pad violation. I seem to go through an iterative process
where I drop the via, then slide it to clear the violation I create, or
to push it up to the pad.
No combination of shove or hug in the options tab seems to help. eg you
might think that shove might push the via away from the pad as you place
it, if it was going to violate.
>From memory, Veribest would ghost a via on your cursor (so you could
see how much room it was going to take up) and it would change colour
(or something) to let you know if there was going to be a violation ie
it was not a valid via site.
Cheers,
Steve
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Steve Kingdon PCB Design Engineer
Allied Telesyn Research Level 2, 445 New North Rd
ph. 64 9 815 9824 Kingsland, Auckland
email: steve.kingdon@xxxxxxxxxxxxxxxxxxx
web: http://www.alliedtelesyn.co.nz/
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