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Restriction of autorouter?

Former Member

Hi,

 

I'm still pretty new to Eagle. I've made a few PCB's so far, and they've

turned out great, but I hadn't used the autoroute function at all until

now. I need some advice.

 

I've already routed a particular area of the board since it is a

measurement circuitry area. However, now that I want to route all of the

digital signals, is there a way to restrict the autorouter such that it

does not mess with my already routed measurement circuitry?

 

Regards,

Brian

 

Parents

  • Telemachus wrote on Mon, 15 February 2010 22:06

    James,

     

    Ok, thanks for the advice. Is there literature out there that goes over

     

    the "art of autorouting" in Eagle or anything?

     

     

    The best way is to sit down and play with it to get a feel for how it

    behaves and what the parameters do.  There is a useful section of the

    manual that explains all the parameters and their ranges.

     

    Quote:

    What I've ended up doing so far is to route the simple digital stuff,

    most of the analog measurement circuitry, and the power lines, but then

     

    divided my board into the parts that I've routed and those that haven't

     

    using the "restrict" layers. It seems to have worked: I ran the

    autorouter and it routed the complicated digital signals that would

    have

    taken me forever.

     

     

    That's a good way to use it.

     

    Quote:

    However, I guess I should clarify what I mean by "touching" the analog

     

    circuitry that I've already routed. For all intents and purposes, the

    circuitry that I've routed is perfect, but it wasn't to the autorouter

     

    because it looks to end traces smack-dab in the middle of SMD pads.

    Since I've got a mix of packages, it added all of these crazy angular

    traces, which I have to go back and delete now. Is there any way to

    stop

    the router from doing this?

     

     

    Yes and no.  You can use the command line to have the auto-router ignore

    certain signals or to only route certain signals.  See "help auto" for more

    info.  Note, wildcards can be used.

     

    But you really want to connect the final ends of those traces.  The

    ratsnest will report traces unrouted until they are all gone.  And you

    don't want to risk missing one that actually is not routed because you have

    100 that are almost routed.

     

    EAGLE 5 now has magnetic snap for the last segment to the center of the

    pads/smds so it's much nicer than it used to be.  So make use of that and

    route it right to the connection point.  If you finish a net EAGLE will

    beep at you so you know it's done.

     

    Cheers,

     

    James.

    --

    James Morrison  ~~~  Stratford Digital

     

    email:  james@eaglecentral.ca

    web: http://www.eaglecentral.ca

     

    Specializing in CadSoft EAGLE

    • Online Sales to North America

    • Electronic Design Services

    • EAGLE Enterprise Toolkit

    --

    Browser access to CadSoft Support Forums at http://www.eaglecentral.ca

     

Reply

  • Telemachus wrote on Mon, 15 February 2010 22:06

    James,

     

    Ok, thanks for the advice. Is there literature out there that goes over

     

    the "art of autorouting" in Eagle or anything?

     

     

    The best way is to sit down and play with it to get a feel for how it

    behaves and what the parameters do.  There is a useful section of the

    manual that explains all the parameters and their ranges.

     

    Quote:

    What I've ended up doing so far is to route the simple digital stuff,

    most of the analog measurement circuitry, and the power lines, but then

     

    divided my board into the parts that I've routed and those that haven't

     

    using the "restrict" layers. It seems to have worked: I ran the

    autorouter and it routed the complicated digital signals that would

    have

    taken me forever.

     

     

    That's a good way to use it.

     

    Quote:

    However, I guess I should clarify what I mean by "touching" the analog

     

    circuitry that I've already routed. For all intents and purposes, the

    circuitry that I've routed is perfect, but it wasn't to the autorouter

     

    because it looks to end traces smack-dab in the middle of SMD pads.

    Since I've got a mix of packages, it added all of these crazy angular

    traces, which I have to go back and delete now. Is there any way to

    stop

    the router from doing this?

     

     

    Yes and no.  You can use the command line to have the auto-router ignore

    certain signals or to only route certain signals.  See "help auto" for more

    info.  Note, wildcards can be used.

     

    But you really want to connect the final ends of those traces.  The

    ratsnest will report traces unrouted until they are all gone.  And you

    don't want to risk missing one that actually is not routed because you have

    100 that are almost routed.

     

    EAGLE 5 now has magnetic snap for the last segment to the center of the

    pads/smds so it's much nicer than it used to be.  So make use of that and

    route it right to the connection point.  If you finish a net EAGLE will

    beep at you so you know it's done.

     

    Cheers,

     

    James.

    --

    James Morrison  ~~~  Stratford Digital

     

    email:  james@eaglecentral.ca

    web: http://www.eaglecentral.ca

     

    Specializing in CadSoft EAGLE

    • Online Sales to North America

    • Electronic Design Services

    • EAGLE Enterprise Toolkit

    --

    Browser access to CadSoft Support Forums at http://www.eaglecentral.ca

     

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