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Issue with 3D ( IDF(EMN,EMP)

Raam

I am having some issue with IDF file and details given bellow.

In Footprint at placebound property i am assigning maximum height of the component and also the placebound area i am creating larger size than the actual body size, because this shows the package to package separation error, so in the IDF file obviously component will have approximate (larger) size with correct height which i given and this makes problem in CAD like showing the component hitting with encloser

My requirements:.

Any one of the actual body shape should have the property of max-height, which is going to support IDF file.

Other one of the shape should have the property of package clearance, which supports to show the package to package error.

Please any body give me remedy,

 

  • djhutchi

    Raam,

    Here is my suggestion, based upon what we have discovered using 16.3:

                   Make your place_bound_top shape match the actual package body outline

                   Make a dfa_bound_top shape that includes the place_bound_top and pin extents

                   Create dfa spacing table to specify the package clearances between different package types

    By default the IDF output uses the DFA_BOUND outlines, not the PLACE_BOUND, you can change that with the following Allegro variables:

                   set idf_place_bounds_bottom = PLACE_BOUND_BOTTOM

    set idf_place_bounds_top = PLACE_BOUND_TOP

    Also, by default the IDF output uses the HEIGHT property attached to the component definition, not the height attached to the place_bound shapes, to disable that set the following Allegro variable:

    set idf_ignore_comp_height

     

  • oscar migs

    Raam,

     

    Have you defined the minimum height for PACKAGE KEEPOUT/TOP shape?

    The maximum height defined by IDF is really the minimum height.

     

    Best,

    -oscar

  • oscar migs

    Hi Raja,

     IDF has a limitation of defining only the maximum height for all objects.

     Turn on the Package Keepout Top or Bottom layer and assign a minimum height property, which is the maximum height..

     Best of luck,

    -oscar

  • steve

    In PCB Editor you can have multiple place_bound_top shapes and you can use package_height_min and max to control the overlaps so you could specify the actual component body and the max height but use a different shape with a max height of zero for the PCB keepout area. The alternative would be to keep the place bound as is and when the IDF file is imported into the 3D Mechanical Tool (Pro-E or Inventor etc) then have an actual model created (in a MCAD library) that is used instead of the standard 3D block created by the IDF. I think all you need to do is have a 3D model called the same as the footprint name (i.e. SOIC20 for both PCB and MCAD).

  • Raam
    Can u please guide me, how to set the variables for the following?

    set idf_place_bounds_bottom = PLACE_BOUND_BOTTOM

    set idf_place_bounds_top = PLACE_BOUND_TOP

    set idf_ignore_comp_height
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