{
  "board": "PhoneRail-Board2",
  "status": "TOPOLOGY_DEFINED_NOT_ROUTED",
  "sequence": [
    "upstream_usb",
    "hub_crystal_and_decoupling",
    "downstream_usb_pairs",
    "hub_control",
    "port_vbus",
    "power_and_ground_planes"
  ],
  "reference_layers": {
    "F.Cu": "In1.Cu continuous ground for USB where F.Cu is used",
    "B.Cu": "In2.Cu continuous ground for USB where B.Cu is used"
  },
  "upstream": {
    "path": ["J23", "USB_ESD", "U32"],
    "layer": "B.Cu",
    "max_connector_fanout_mm": 3.0,
    "forbid_stubs": true
  },
  "downstream": {
    "source": "U32",
    "destinations": ["J31", "J32", "PHONE_PORT_3", "PHONE_PORT_4", "PHONE_PORT_5"],
    "layer": "F.Cu",
    "pair_length_mismatch_max_mm": 0.5,
    "same_via_count": true
  },
  "power": {
    "hub_3v3": "U32_each_supply_pin_to_local_decoupler_then_3V3_zone",
    "vbus": "per_port_switch_output_to_local_connector",
    "usb_ground_is_not_vbus_return": true
  },
  "review_gates": [
    "verify_port_net_mapping",
    "verify_reference_plane_continuity",
    "verify_pair_skew_and_via_symmetry",
    "verify_no_crossing_power_split",
    "verify_return_via_within_1mm_of_signal_via"
  ]
}