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Purpose of No Probe Top and DFA Top |
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ANANDT 
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Joined: 30 Apr 2022 Status: Offline Points: 2 |
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 Topic: Purpose of No Probe Top and DFA TopPosted: 27 Jun 2022 at 9:13pm |
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Hi,
I'm currently working with Allegro, please explain the purpose of No probe TOP why do we need to add one for our footprint. Next if we create a standard footprint using Allegro Footprint wizard it creates Place Bound Top along with DFA Top how one differs from another and purpose of it. Please explain. |
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Tom H
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Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5719 |
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Posted: 28 Jun 2022 at 8:35am |
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I'm not an expert on the Allegro CAD tool, but I am familiar with the terms.
You would use a "No probe TOP" feature if you're using Test Points. They cannot be placed under a footprint because they need to be Probed. The No probe TOP feature throws a DRC error if a Test Point is in the No Probe area. Also, Allegro has a feature for auto-placing test points. That feature will avoid all No probe TOP areas. Place Bound Top is used to establish a part placement area. You set spacing rules for each component footprint. If you violate the Place Bound spacing rules Allegro throws a DRC error. Other CAD tools that have less features use a Placement Courtyard boundary outline as a guide for part placement. |
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