You can control whether vias are allowed under SMD pads by using the via_at_smd rule.
rule pcb (via_at_smd [off | on [(grid [off | on])] | [(fit [off | on])] | [(thru [off | on])]])
When the via_at_smd rule is on, the autorouter can place vias under SMD pads. The default setting is off. Example:
rule pcb (via_at_smd on)
Copyright © January 2002 Cadence Design Systems, Inc.
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