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Grabbing airwires on routing

autodeskguest

 

There is a weakness how Eagle grabs the end of an airwire. Look at the

attached img simplified to represent a chained flyby address signal of a

ddr ram.

 

The red layer is terminated to TP1, so when I click the airwire at TP1,

I expect it to grab the green layer, but if my current active layer is

closer to the red layer, it will grab the red wire. It would perform at

best if a loose wire end took priority over a terminated end.

 

This is causing me some grief.

 

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  • Hi Morten,

     

    It took me a second to work out what you were getting at but once I did I

    realised I have come across this exact problem several times and it's

    really quite frustrating as it's fiddly to work around.

     

    I found I had to put in a temporary via in between the two locations I was

    trying to connect, placed directly in the path where the trace would go, to

    give the air wire somewhere else to go to and hitting ratsnest, and then

    routing from that in both directions. Then once the trace was correctly

    routed I removed the via. It's fiddly as hell and can sap time if you have

    to do this a lot (like for an entire DDR bus!).

     

    I like your suggestion of making the loose end have priority over the

    terminated end of the air wire, I think this would solve the problem but I

    am unsure if there would be any unintended consequences of this, that would

    have to be thoroughly tested I think. Maybe having a way of toggling the

    start of the route to the other end of the air wire (or scrolling through

    several if it went off in multiple directions) would be another way to do

    it.

     

    Best Regards,

     

    Rachael

     

     

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

Reply

  • Hi Morten,

     

    It took me a second to work out what you were getting at but once I did I

    realised I have come across this exact problem several times and it's

    really quite frustrating as it's fiddly to work around.

     

    I found I had to put in a temporary via in between the two locations I was

    trying to connect, placed directly in the path where the trace would go, to

    give the air wire somewhere else to go to and hitting ratsnest, and then

    routing from that in both directions. Then once the trace was correctly

    routed I removed the via. It's fiddly as hell and can sap time if you have

    to do this a lot (like for an entire DDR bus!).

     

    I like your suggestion of making the loose end have priority over the

    terminated end of the air wire, I think this would solve the problem but I

    am unsure if there would be any unintended consequences of this, that would

    have to be thoroughly tested I think. Maybe having a way of toggling the

    start of the route to the other end of the air wire (or scrolling through

    several if it went off in multiple directions) would be another way to do

    it.

     

    Best Regards,

     

    Rachael

     

     

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

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