kicad/pcbnew/dialogs/panel_setup_rules_help.md

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### Top-level Clauses
(version <number>)
(rule <rule_name> <rule_clause> ...)
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### Rule Clauses
(constraint <constraint_type> ...)
(condition "<expression>")
(layer "<layer_name>")
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### Constraint Types
* annular_width
* clearance
* courtyard_clearance
* diff_pair_gap
* diff_pair_uncoupled
* disallow
* edge_clearance
* length
* hole
* hole_clearance
* silk_clearance
* skew
* track_width
* via_count
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### Item Types
* buried_via
* graphic
* hole
* micro_via
* pad
* text
* track
* via
* zone
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### Examples
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# Comment
(rule "copper keepout"
(constraint disallow track via zone)
(condition "A.insideArea('zone3')"))
(rule "BGA neckdown"
(constraint track_width (min 0.2mm) (opt 0.25mm))
(constraint clearance (min 0.05) (opt 0.08mm))
(condition "A.insideCourtyard('U3')"))
(rule HV
(constraint clearance (min 1.5mm))
(condition "A.NetClass == 'HV'"))
(rule HV
(layer outer)
(constraint clearance (min 1.5mm))
(condition "A.NetClass == 'HV'"))
(rule HV_HV
# wider clearance between HV tracks
(constraint clearance (min "1.5mm + 2.0mm"))
(condition "A.NetClass == 'HV' && B.NetClass == 'HV'"))
(rule HV_unshielded
(constraint clearance (min 2mm))
(condition "A.NetClass == 'HV' && !A.insideArea('Shield*')))
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### Notes
Version clause must be the first clause.
Rules should be ordered by specificity. Later rules take
precedence over earlier rules; once a matching rule is found
no further rules will be checked.
Use Ctrl+/ to comment or uncomment line(s).
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### Expression functions
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All function parameters support simple wildcards (`*` and `?`).
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True if any part of `A` lies within the given footprint's courtyard.
A.insideCourtyard('<footprint_refdes>')
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True if any part of `A` lies within the given zone's outline.
A.insideArea('<zone_name>')
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True if `A` has a hole which is plated.
A.isPlated()
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True if `A` is a member of the given group. Includes nested membership.
A.memberOf('<group_name>')
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True if `A` exists on the given layer. The layer name can be
either the name assigned in Board Setup > Board Editor Layers or
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the canonical name (ie: `F.Cu`).
A.existsOnLayer('<layer_name>')
NB: this returns true if `A` is on the given layer, independently
of whether or not the rule is being evaluated for that layer.
For the latter use a `(layer "layer_name")` clause in the rule.