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Unexpected behavior of EAGLE layout editor

SMD111

The problem I have is described in the attached images (they are zoom-able).

I have a finalized, fully routed design:

image

At some point I decided to add a new gate to the schematic, so I copy IC5 and paste it as IC9. Please note that no connections on IC9 have been made yet:

image

Simply placing this gate on schematic causes significant changes on the board. As you can see, multiple nets become ripped up, even the nets that have nothing to do with IC5 or IC9.

image

Is it possible to avoid this effect?

Thank you,

Sergey

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  • 0

    On 22/07/2017 3:35 a.m., SMD111 wrote:

    The problem I have is described in the attached images (they are zoom-able).

    I have a finalized, fully routed design:

     

      At some point I decided to add a new gate to the schematic, so I copy IC5 and paste it as IC9. Please note that no connections on IC9 have been made yet:

     

    Simply placing this gate on schematic causes significant changes on the board. As you can see, multiple nets become ripped up, even the nets that have nothing to do with IC5 or IC9.

     

    Is it possible to avoid this effect?

    Thank you,

    Sergey

     

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    Hi Sergey

     

    It's important to say which version of Eagle you are using.

     

    I use v7.7 (Win7)  and can demonstrate I don't have  your problem.

    Using the example Schem/Board Hexapod I can copy a device in the

    schematic and it appears without air-wires on the board, ready to be

    placed. The rest of the board remains unaltered.

     

    It may be the technique you are using to copy the part (ah! maybe the v8

    select mechanism has caught you out). I simply right click on the symbol

    (IC5) and select copy from the context menu. Then you will only have the

    IC stuck to the cursor and no nets connected to the pins.

     

     

    HTH

    Warren

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  • 0 in reply to autodeskguest

    Hi Warren, thank you for replying.

     

    I have EAGLE 6.4.0 Professional. It is old, but I like "good old" things :-)

     

    And for copying, I just select the copy mode on the toolbar, then click on the gate, then the IC is duplicated and stuck to cursor, then I place it with a click. After that I press "Switch to board" button and see airwires in some places where traces used to be.

  • 0 in reply to SMD111

    On 22/07/2017 8:14 a.m., SMD111 wrote:

    Hi Warren, thank you for replying.

     

    I have EAGLE 6.4.0 Professional. It is old, but I like "good old" things image

     

     

    I recommend downloading the last version 6 release which is 6.6 from here

     

    ftp://ftp.cadsoft.de/eagle/program/

     

    There were worthwhile fixes and added functionality in v6.5. and v6.6

    I seem to remember 6.4 as being particularly not good.

     

    Hopefully you still have your licence keys etc. If not you can get them

    again from Autodesk support.

     

    HTH

    Warren

     

     

     

     

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  • 0 in reply to autodeskguest

    Hi Warren,

    thanks again for your support and advise.

    I was able to solve this problem, and would like to share with you how I did it.

    This is a 4-layer board with the inner layers being VCC and GND. There are power supply traces ob both sides, too.

    I usually keep the inner layers hidden (there is nothing to see there). So I accidentally discovered that having them hidden was the reason of EAGLE behavior as I described: all routed power traces get converted to airwires. However, if I make the power layers visible, then copy and place the new gate, all existing power traces stay preserved and only the new gate has airwires from its power pins to the nearest points corresponding to VCC and GND nets. This state does not change after I hide the inner layers again.

    BTW, this is another oddity that power pins of a new gate get airwired to supply nets automatically, even though the supply pins on the schematic are not invoked yet.

     

    Best,

    Sergey