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Autodesk EAGLE
EAGLE User Chat (English) Re: optimize after autoroute?
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Forum Thread Details
  • Replies 3 replies
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Related

Re: optimize after autoroute?

Former Member
Former Member over 17 years ago

 

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  • angelus9
    angelus9 over 17 years ago

    I have been using the Autorouter it it works quite well - Maximize the via

    numbers (why limit this) and set up your preferences and let it rip.

     

    I then go back and pretty up the traces - then it is done.

     

    I am working on a more complex board which will give it a good test.

     

    Anyone else with experience with this tool who would comment on do's and

    don'ts?

     

    Don

     

     

     

     

    "Harald Kipp" <eagle@egnite.de> wrote in message

    news:fhf112$i1$1@cheetah.cadsoft.de...

    Mark Lucia schrieb:

    With some larger projects, I'll run the auto router with all optimization

    turned off, simply to get a feel for part placement.

     

    I'm doing this sometimes as well.

     

     

    I found that if I then enable the optimizers, and run the auto router

    once again, nothing changes - I suspect because the auto router no longer

    knows about the vias - (shows VIAS: 0)

     

    Not sure, if I understood this correctly. AFAIK, the autorouter will not

    touch any trace, which had been routed already. It will route airwires

    only.

     

    Harald

     

     

     

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  • autodeskguest
    autodeskguest over 17 years ago in reply to angelus9

    Don Golding wrote:

    I have been using the Autorouter it it works quite well - Maximize the via

    numbers (why limit this) and set up your preferences and let it rip.

     

    Are you serious ??

     

    for high speed or low noise design routing is critical, and this

    includes what side the tracks are on, and where the vias are

     

    Numerous vias can also affect reliability, manufacturabilty, EMC.

     

    Most of my design fall into this category, in which case the autorouter

    is very poor.  Personally I never use it.

     

    In general low cost autorouters are appropraite for moderate speed

    digital designs on a minimum of 4 layers.  New users should first learn

    to appreciate the importance of current flow in the layout before

    considering touching the autorouter.

     

    Anything else should pretty much be routed by hand.

    Too often the autorouter just encourages lazy routing and too many

    newbies use it and don't understand the importance of return current

    flow in design of optimum PCB layout.

     

    In which case my main comment is do not use the autorouter for single or

    two layer designs.

     

    cheers

     

    David

     

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  • angelus9
    angelus9 over 17 years ago in reply to autodeskguest

    I agree with you your observations!

     

    All speed sensitive or impedance critical routes should be done by hand -

    first.  Route the clock, impedance matched lines, power traces first by

    hand.

     

    I use it on four layer boards typically and rarely go above 50mhz digital

    designs.  I do alot of low frequency analog and motor control, embedded

    processor stuff which is not layout critical. typically.

     

    Use the right tool for the right job.  I move things around a little bit

    after it is done - I think the most offensive thing the autorouter produces

    is more vias, which I don't think is a big deal today, and it is very useful

    for  lower speed designs and complex IO type of stuff.

     

    On the other hand, it is pretty fexible and it doesn't seam to put many

    crazy routes around the board.  For the price, it is very good....

     

    Don

     

    "David" <david@nospam.com> wrote in message

    news:fo23bf$be5$1@cheetah.cadsoft.de...

    Don Golding wrote:

    I have been using the Autorouter it it works quite well - Maximize the

    via numbers (why limit this) and set up your preferences and let it rip.

     

    Are you serious ??

     

    for high speed or low noise design routing is critical, and this includes

    what side the tracks are on, and where the vias are

     

    Numerous vias can also affect reliability, manufacturabilty, EMC.

     

    Most of my design fall into this category, in which case the autorouter is

    very poor.  Personally I never use it.

     

    In general low cost autorouters are appropraite for moderate speed digital

    designs on a minimum of 4 layers.  New users should first learn to

    appreciate the importance of current flow in the layout before considering

    touching the autorouter.

     

    Anything else should pretty much be routed by hand.

    Too often the autorouter just encourages lazy routing and too many newbies

    use it and don't understand the importance of return current flow in

    design of optimum PCB layout.

     

    In which case my main comment is do not use the autorouter for single or

    two layer designs.

     

    cheers

     

    David

     

     

     

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