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Difference Between Add--Circle menu and Shape--Circular menu when creating PCB Symbol (Allegro 16.5)

seaseng
Sorry for the newbie question but I have created a SSOP8 PCB symbol in the Allegro PCB editor (16.5) and I would like to add a small circle to the silkscreen to indicate which pin is pin 1. Now should I do this by going to the Add menu and then clicking Circle or should I do it by clicking Shape and then clicking on Circular? What is the difference between the two? Furthermore, this is a top layer footprint and I will be adding the circle to both the Package Geometry--Assembly_Top and Package Geometry--Silkscreen_Top subclasses. Is this correct? Regards
  • Pawandeep
    Hi, I believe it should be under Add menu for Circle. There you can find the relevant Package Geometry class and then as required use the Assy Top subclass. The shape-Polygon works for electrical/copper shapes.
  • steve

    In reagrd to your layer selection you are correct. The Assembly_Top for an Assembly drawing view and the Silkscreen_Top for the actual silkscreen. If you use the Add - Circle you will get a circle of a defned width, If you use the Add - Shape - Circular you will get a filled circular shape.... so it's really up to you what you require.

  • Brian Rocks
    Bumping this thread - I created a pin 1 identifier on the silkscreen like this (filled circle). I updated the symbols on my design and it shows up. However, when I try to Manufacture -> Silkscreen then Manufacture -> Artwork, it doesn't appear that the circles appear on Autosilk layer or the output file. Am I doing something wrong with this approach?
  • eDave
    Unfortunately shapes do not get copied to the Autosilk layer (note the elements selection options on the form). When you are ready to try adding Skill utilities to your system, troll through the forum and download my silkscreen utility that does this and a bit more.
  • mcatramb91

    Auto Silkscreen will only copy Lines and Text to the Autosilk layer, that is why the shapes (filled circles) you created are not being copied.

    The way Auto Silkscreen works it copies elements to the Autosilk layer and trim them based on the Element to pad clearance - this will not work with shapes.   Suggest making a circle with a line width to form your pin 1 identifier dot which will be copied to Autosilk.

    Hope this helps,

    Mike Catrambone

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