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Back Annotation of references

autodeskguest

I've searched but cannot find how to force a 'back annotation' of all the

component reference designators.

 

Once I'm done with a layout I want to 'run something' that reorders the

refs; top to bottom, left to right.

 

How's it done?

 

Thanks.

--

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

 

Parents

  • Hi Gary.

     

    When you hand a board to an assembly house they are not pleased by a

    completely random spattering of the part numbers.  R1 at the bottom R40 at

    the top and R41 next to R1.  This increases labor time for anyone working

    on the boards.

     

    The normal schematic to PCB process results in this random placement on the

    PCB.

     

    All the other packages I've ever used had a Back Annotation Feature. (which

    is not the same as what Eagle calls Back Annotation).

     

    Typically you run the Back Annotation Feature and it asks a few questions

    like; What is the horizontal stripe width? - which paces how parts are

    renumbered verses their vertical physical separations.

     

    It then scans the PCB making a table of all the part numbers of every type

    of parts reference based on the selected scan pattern.  Rx, Cx, Lx, etc.,

    etc.

     

    It then re-assigns all the Reference Designators in the desired pattern,

    typically like you'd read a book.  Of course it's vital that this be

    reflected back to the schematic.

     

    As far as I can tell this is such fundamental requirement of good layout,

    that it must have been provided somehow or somewhere.  I'm just not seeing

    it.

    --

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

     

Reply

  • Hi Gary.

     

    When you hand a board to an assembly house they are not pleased by a

    completely random spattering of the part numbers.  R1 at the bottom R40 at

    the top and R41 next to R1.  This increases labor time for anyone working

    on the boards.

     

    The normal schematic to PCB process results in this random placement on the

    PCB.

     

    All the other packages I've ever used had a Back Annotation Feature. (which

    is not the same as what Eagle calls Back Annotation).

     

    Typically you run the Back Annotation Feature and it asks a few questions

    like; What is the horizontal stripe width? - which paces how parts are

    renumbered verses their vertical physical separations.

     

    It then scans the PCB making a table of all the part numbers of every type

    of parts reference based on the selected scan pattern.  Rx, Cx, Lx, etc.,

    etc.

     

    It then re-assigns all the Reference Designators in the desired pattern,

    typically like you'd read a book.  Of course it's vital that this be

    reflected back to the schematic.

     

    As far as I can tell this is such fundamental requirement of good layout,

    that it must have been provided somehow or somewhere.  I'm just not seeing

    it.

    --

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

     

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