(version 1)

# The edge-launch SMA copper must reach the routed board edge by construction.
(rule "J2 edge-launch lands"
    (condition "A.Reference == 'J2' || B.Reference == 'J2'")
    (constraint edge_clearance (min -0.01mm)))

# The manufacturer USB-C locating holes are 0.194 mm from grounded shell
# lands.  This exception is internal to the qualified connector footprint.
(rule "USB-C locating-hole clearance"
    (condition "A.Reference == 'J1' && B.Reference == 'J1'")
    (constraint hole_clearance (min 0.19mm)))

# RZV0024A is an ultra-dense high-current package.  Its adjusted corner lands
# and thermal zones meet the selected JLCPCB 0.10-mm copper rule.
(rule "TPS6287B RZV internal clearance"
    (condition "A.Reference == 'U13' && B.Reference == 'U13'")
    (constraint clearance (min 0.10mm)))

# Inside the Ti375 escape field the 0.8-mm ball pitch fixes the geometry: a
# 0.45-mm dogbone via between four lands leaves 0.1407 mm, and a 0.12-mm trace
# threading between two lands leaves 0.14 mm only if it stays exactly centred.
# This field therefore runs at the fabricator's 0.10-mm copper minimum, which
# is what the Default class uses across the rest of the board anyway.  The rule
# only fires when one of the two objects belongs to U1, so it relaxes copper
# against the balls and nothing else: two tracks crossing the field still owe
# each other their own net classes' clearance, CLOCK's 0.15 mm included.
(rule "Ti375 0.8-mm BGA escape clearance"
    (condition "A.Reference == 'U1' || B.Reference == 'U1'")
    (constraint clearance (min 0.10mm)))

# JLC08161H-3313 L1/L2 geometry (3313 prepreg, 0.0994 mm, er 4.1).  Net-class widths are routing defaults only;
# these rules make the controlled-impedance geometries actual DRC limits.
(rule "GNSS 50-ohm CPWG geometry"
    (condition "A.NetClass == 'RF50_CPWG'")
    (constraint track_width (min 0.164mm) (opt 0.164mm) (max 0.164mm)))

(rule "GNSS RF stays on top layer"
    (condition "A.NetClass == 'RF50_CPWG' && A.Type == 'Track' && A.Layer != 'F.Cu'")
    (constraint disallow track))

(rule "USB2 90-ohm differential geometry"
    (condition "A.NetClass == 'USB90_DIFF'")
    (constraint track_width (min 0.135mm) (opt 0.135mm) (max 0.135mm)))

# The TPD2EUSB30A clamp is a SOT-23 whose ground pad sits between its two
# channel pads, so the pair has to open up for about 1.5 mm to pass it.  The
# 0.90-mm coupled limit still applies over the whole rest of the run.
(rule "USB2 coupled gap"
    (condition "A.NetClass == 'USB90_DIFF' && AB.isCoupledDiffPair() && !A.intersectsArea('USB_ESD_BREAKOUT')")
    (constraint diff_pair_gap (min 0.15mm) (opt 0.15mm) (max 0.90mm)))

# The 50-ohm line owns the band it runs in on every layer under F.Cu, so no
# digital route can pass beneath or immediately beside it.  Ground stitching
# and the MAX2771's own supply drops still have to reach it, so the disallow is
# scoped to the signal classes rather than made a plain keepout.  The RF line
# itself is on F.Cu, which the area does not cover, and the L2/L7 GND planes
# stay solid because nothing routes on them at all -- the actual RF return path
# is guaranteed by those planes, not by this area.
#
# The area covers y <= 43.7, which is the same corridor generate_pcb.py
# reserves as TEMP_RF_LINE and clears the RF copper (y <= 42.6) by 1.1 mm.  It
# deliberately stops short of the MAX2771's digital pin rows at y = 44.5 ..
# 47.4: those pins have to reach the FPGA, and with the area extended over them
# every one of them was forced onto F.Cu alone, which does not fit.
(rule "No digital copper under the GNSS front end"
    (condition "A.intersectsArea('RF_NO_DIGITAL') && A.NetClass != 'POWER'")
    (constraint disallow track via))

(rule "Clock trunk width outside Ti375 escape"
    (condition "A.NetClass == 'CLOCK' && A.Type == 'Track' && !A.insideCourtyard('U1')")
    (constraint track_width (min 0.15mm)))

# A 0.8-mm ball pitch leaves a 0.35-mm channel between two adjacent 0.45-mm
# dogbone vias.  A 0.10-mm trace fits that channel at the escape field's
# 0.10-mm copper minimum but not at CLOCK's 0.15 mm, so a clock ball could not
# be escaped from the package at all.  Inside the field -- and only where BOTH
# objects are inside it -- copper therefore runs at the same 0.10 mm the rest
# of this field already uses.  The clock trunk keeps its 0.15 mm the moment it
# leaves U1's courtyard, which is where coupling to neighbours actually costs
# something.
(rule "Ti375 escape field copper clearance"
    (condition "A.insideCourtyard('U1') && B.insideCourtyard('U1')")
    (constraint clearance (min 0.10mm)))