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which shape type (dynamic/static) to be used in negative power planes?

VPSingh

Q1. which shape type (dynamic/static) to be used in negative power planes and why?

  • VPSingh

    We are using allegro 16.2 tool.

    Q1. which shape type (dynamic/static) to be used in negative power planes and why?

  • steve
    in reply to VPSingh

    I would always use Dynamic - because they "dynamically" update when you make changes like adding vias - but then again I wouldn't use negative artworks anymore either. With Positive Dynamic shapes and WYSIWYG it's much easier and clearer to actually see the copper shapes rather than trying to work out the negative of one - especially with split planes etc.

  • mcatramb91

    Negative planes still have their place in some designs and if you continue to use them I would recommend using Dynamic shapes.

    Why? Dynamic shapes will automatically void any Route Keepouts on the layer (For example, Keepouts around mounting holes) while pins and vias will continue to use geometries defined in the Padstack.

    Hope this helps,
    Mike Catrambone

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