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Different pad to pad spacing value

khuranav007

I would like to know how to handle this scenario in Cadence Allegro:

I have two pads, Pad1 and Pad2 and both are connected to different nets.

Say I have Pad to Pad spacing value of 50um and Pad to Shape spacing value of 100um - both defined in Constraint Manager.

Pad2 is flooded with shape (not completely, but partially - Pad2 net and shape net are same) and because of this I now want Pad1 and Pad2 spacing so that it is not 50um (can be 100um or 120um or 200um)

Can this be setup using existing constraints in Constraint Manager.  I would prefer that online DRC prevents this.

Thanks for any ideas.

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    May I confirm the reason for the increased spacing? Currently I assume that the soldermask surrounding the pad is possibly the key issue here. Having a partially flooded pad means the exposed copper will come closer to the adjacent pad, effectively making the pad wider. Is this the issue you are trying to control? A snapshot would be useful to help understand the problem. 

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  • 0

    May I confirm the reason for the increased spacing? Currently I assume that the soldermask surrounding the pad is possibly the key issue here. Having a partially flooded pad means the exposed copper will come closer to the adjacent pad, effectively making the pad wider. Is this the issue you are trying to control? A snapshot would be useful to help understand the problem. 

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