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Out of practice. Blind-Buried Vias in Allegro L.

Robert Finley

I need to stay current on drilling from layer 1-4 on an 8 layer stackup.  But, when I try to add a via to the fourth layer using the Add-via dialog box, I end up with via pads on 5-6 and 7-8.

 Am I reasonable to expect there is a way to go 1-2, 2-3, and 3-4 in Allegro L?  (yeah, I know bout the same-net DRC that I don't have.)

I do have a unique padstack for the microvia defined as single-layer in the padstack manager pad definition.

 Should the padstack name show up when I  check Setup>  B/B via definitions> Definte B/B Via?

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  • redwire

     Remember that Allegro only chooses those valid vias which match the start and end layer shown in the options box.  Whenever you have the wrong layers chosen, Allegro reverts to a valid thru-hole via.

    Yes, you can do 1-2, 2-3, 3-4, etc... microvias.  Be sure to talk to your fabricator well in advance of this.  Have had good luck with MEI and DDI on doing stacked microvia technology,

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  • redwire

     Remember that Allegro only chooses those valid vias which match the start and end layer shown in the options box.  Whenever you have the wrong layers chosen, Allegro reverts to a valid thru-hole via.

    Yes, you can do 1-2, 2-3, 3-4, etc... microvias.  Be sure to talk to your fabricator well in advance of this.  Have had good luck with MEI and DDI on doing stacked microvia technology,

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