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 Triangle marker 

Last post Mon, Dec 3 2007 5:00 AM by archive. 3 replies.
Started by archive 03 Dec 2007 05:00 AM. Topic has 3 replies and 1050 views
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  • Mon, Dec 3 2007 5:00 AM

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    Triangle marker Reply

    I am working on a board translated from Orcad. It is 10 layers with 4 planes. Two of the three ground planes display correctly showing the voids and x's for the thermals. However, the power plane and one ground plane don't show these at all. I created these planes the same as I did for the others. Any idea what is wrong?

    I did notice a triangle appearing on some pads. Could anyone tell me what this means? Thanks

    Sandy


    Originally posted in cdnusers.org by MURPHYS
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  • Mon, Dec 3 2007 11:11 AM

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    RE: Triangle marker Reply

    Are these positive or negative planes? Also are they static or dynamic? Does your thermal flash exist in the library? Finally, look at the shape parameters on the Thermal relief connects tab.
    Regards,
    Harold


    Originally posted in cdnusers.org by Hpattie
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  • Mon, Dec 3 2007 11:29 AM

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    RE: Triangle marker Reply

    They are positive planes and dynamic. I elected to use positive planes so I wouldn't have to create thermal flashes. Also I noted somewhere that split planes can only be done with positive planes and a lot of our boards have split planes.


    Originally posted in cdnusers.org by MURPHYS
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  • Mon, Dec 3 2007 5:41 PM

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    RE: Triangle marker Reply

    Hi Murphys,

    No, splits commonly WERE done only in Negative planes going way back. Positive planes were seldom used because of the file size they generate. With more and more memory now-a-daz that's not a limitation.

    Negative planes, and anti-etch will provide you the plane splits you require. You still need to define the shapes on the NEG layers for allegro to see connections, and it' very easy to do. Give it a try. You never know, you might like it.

    I even think there's a video on Sourcelink showing how to create NEG planes and plane splits. :)

    Good day.
    Mitch


    Originally posted in cdnusers.org by cadpro2k
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Started by archive at 03 Dec 2007 05:00 AM. Topic has 3 replies.