Autorouters work well with single sided boards, but
only if you don't mind to have long tracks.
I've used some autorouters that seem to be pretty
dumb, with multilayer boards, they route 90% of the
connections, then if you retry they route a 5% more,
and maybe in the fourth attempt you have you board
completely routed. As a programmer, I think it has to
do with memory usage: once the program reachs a memory
usage limit, the autorouter stops.
Jose
--- leon_heller <
leon.heller@...>
escribió:
> --- In Homebrew_PCBs@yahoogroups.com, "Stefan
> Trethan"
> <stefan_trethan@g...> wrote:
> >
> > On Thu, 05 Jan 2006 22:18:29 +0100, leon_heller
> > <leon.heller@b...> wrote:
> >
> > >
> > >
> > > I've uploaded images of the most complex
> Pulsonix demo before routing
> > >
> > > and after to Files > LCDpub
> > >
> > >
> > > They are routing1.gif and routing2.gif. Eight
> layers, 1287 pins.
> > >
> > >
> > > The routing (100%) took 2 minutes 17 secs. I
> have a got a very fast
> > >
> > > machine (64-bit twin core Athlon with 1 Gbyte
> RAM). The router does
> > >
> > > cost $2,500, though.
> > >
> > >
> > > Leon
> >
> >
> > Well, give me four layers and i route you that
> mess too ;-)
> > I mean that's not really good routing, is it? it's
> just running traces
> > until you hit another one and setting a via.
> >
> > Also, the parts placement is not good either. It
> looks like the
> parts are
> > just put there more random than anything. Some
> busses seem to run
> right
> > across the board, much longer than they'd need to.
> >
> > Now if we ignore these large scale issues (i'm not
> gonna make 4 layer
> > boards with 1287 pins tomorrow), and look at the
> detail work, it's
> still
> > crap. i mean, look at the very top very left pad,
> what is that?
> > practically whereever i look i see something i
> don't like.
> >
> > This tells me i'm not just too stupid to get my
> autorouter working
> > properly, yours is just as crappy.
> >
> > Could you try a smaller, single sided board?
>
> I can't see anything wrong with the pad that you
> mention, perhaps
> something was lost when I generated the GIF. I think
> it's done a
> pretty good job. It is about the most sophisticated
> router available,
> at the price. It uses lots of different algorithms
> to get the job done.
>
> The component placement looks about right to me, The
> schematic would
> be needed to check that.
>
> I don't think you could route that board manually on
> four layers, and
> if you could it would take you a long time.
>
> Autorouters generally don't work at all well on
> single-sided boards,
> they are usually done manually.
>
>
>
>
>
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>
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>
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