Route multi-pin nets as trees: spanning-tree pairs, T into routed copper
A net's pin groups were joined as a chain in pin order, and each connection had to end on one chosen pin. Groups are now paired by a minimum spanning tree (Manhattan distance between their nearest pins), and a connection may start or end on any copper its net has already routed on that side (path cells, via cells on every layer; not walled cells, whose via moves into the pad). Plane nets keep their drops to the plane. A connection that tees onto another records it as an anchor. Ripping a connection rips what hangs on it, transitively, inside the same rip-up transaction, so rollback restores all of them. The exact engine gets the connections in commit order with their anchors and drops a T whose anchor it rejects. --no-tree restores the chain.
This commit is contained in:
+15
-2
@@ -30,8 +30,8 @@ from freeroute.ses import write_ses
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#: which optional flags each engine actually implements. Anything not listed for
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#: an engine is rejected by :func:`_validate` rather than quietly ignored.
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ENGINE_OPTIONS: dict[str, frozenset[str]] = {
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"grid": frozenset({"rip_up", "max_passes", "seed", "orders", "promote", "access", "negotiate", "rollback"}),
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"exact": frozenset({"shove", "diagonal", "rip_up", "max_passes", "seed", "orders", "promote", "access", "negotiate", "rollback"}),
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"grid": frozenset({"rip_up", "max_passes", "seed", "orders", "promote", "access", "negotiate", "rollback", "tree"}),
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"exact": frozenset({"shove", "diagonal", "rip_up", "max_passes", "seed", "orders", "promote", "access", "negotiate", "rollback", "tree"}),
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"room": frozenset({"shove", "pack"}),
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}
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@@ -48,6 +48,7 @@ _FLAG_NAMES = {
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"access": "--access-cost",
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"negotiate": "--negotiate",
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"rollback": "--no-rollback",
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"tree": "--no-tree",
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}
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@@ -184,6 +185,15 @@ def build_parser() -> argparse.ArgumentParser:
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"connections a rip-up displaces are rerouted at once and the rip-up is undone "
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"if fewer connections end up routed",
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)
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parser.add_argument(
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"--no-tree",
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dest="tree_nets",
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action="store_false",
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help="grid and exact engines: join a multi-pin net's pins as a chain in pin "
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"order, each connection ending on one chosen pin, as before. By default they are "
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"paired by a minimum spanning tree and a connection may end on copper its net "
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"has already routed",
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)
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parser.add_argument(
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"--hole-to-hole",
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type=float,
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@@ -223,6 +233,7 @@ def main(argv: list[str] | None = None) -> int:
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("access", args.access_cost is not None),
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("negotiate", args.negotiate is not None),
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("rollback", not args.rollback),
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("tree", not args.tree_nets),
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)
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if asked
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]
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@@ -260,6 +271,7 @@ def main(argv: list[str] | None = None) -> int:
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"negotiate": args.negotiate or 0,
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"hole_to_hole_mm": args.hole_to_hole,
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"rollback": args.rollback,
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"tree_nets": args.tree_nets,
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}
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elif args.engine == "grid":
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options = {
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@@ -272,6 +284,7 @@ def main(argv: list[str] | None = None) -> int:
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"negotiate": args.negotiate or 0,
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"hole_to_hole_mm": args.hole_to_hole,
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"rollback": args.rollback,
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"tree_nets": args.tree_nets,
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}
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if args.engine == "room":
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result = build_rooms_routing_result(
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@@ -102,6 +102,7 @@ def route_board_exact(
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access_cost: float = 0.0,
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negotiate: int = 0,
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rollback: bool = True,
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tree_nets: bool = True,
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net_widths: dict[int, int] | None = None,
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via_drill: int | None = None,
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hole_to_hole: int = 0,
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@@ -138,6 +139,7 @@ def route_board_exact(
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access_cost=access_cost,
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negotiate=negotiate,
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rollback=rollback,
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tree_nets=tree_nets,
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net_widths=net_widths,
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via_drill=via_drill,
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hole_to_hole=hole_to_hole,
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@@ -194,12 +196,22 @@ def route_board_exact(
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# 25-pin supply net costs that one connection, not the whole net.
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rejected: list[tuple[int, str, str]] = []
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ends_list = result.connection_ends or [("?", "?", "")] * len(result.connections)
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anchors_list = getattr(result, "connection_anchors", None) or [()] * len(result.connections)
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# each net is checked at the width it will be written at: its class's
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# when all of its connections went in at that, else the default
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net_half = dict(result.net_half)
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for (net_no, wires, vias), ends in sorted(
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zip(result.connections, ends_list, strict=False), key=lambda c: c[0][0]
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# a connection that ended on another's copper (a T into its net's tree)
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# dangles if that one is dropped, so it is dropped too; connections come
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# in commit order, anchors first
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dropped_at: set[int] = set()
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for pos, ((net_no, wires, vias), ends, anchors) in sorted(
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enumerate(zip(result.connections, ends_list, anchors_list, strict=False)),
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key=lambda c: c[1][0][0],
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):
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if any(a in dropped_at for a in anchors):
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dropped_at.add(pos)
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rejected.append((net_no, *ends))
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continue
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wire_half = net_half.get(net_no, half_width)
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pieces = _copper_pieces(wires, vias, wire_half, via_layers, via_half)
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boxes = [(box, box_layers) for box, box_layers, _ in pieces]
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@@ -220,6 +232,7 @@ def route_board_exact(
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)
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):
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rejected.append((net_no, *ends))
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dropped_at.add(pos)
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continue # exact-clearance conflict -> drop (may be recovered by shove)
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acc = accepted.get(net_no)
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if acc is None:
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@@ -65,7 +65,7 @@ class RouteResult:
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__slots__ = (
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"wires", "vias", "half_width", "unrouted", "connections", "connection_ends", "failed",
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"net_half", "narrowed",
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"net_half", "narrowed", "connection_anchors",
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)
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def __init__(self, half_width: int) -> None:
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@@ -79,6 +79,9 @@ class RouteResult:
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#: what each routed connection joins, and the zone both ends sit in
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#: (or ""), parallel to ``connections``
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self.connection_ends: list[tuple[str, str, str]] = []
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#: for each routed connection, the earlier ones (positions in
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#: ``connections``) whose copper it ended on, parallel to ``connections``
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self.connection_anchors: list[tuple[int, ...]] = []
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#: connections left unrouted: (net_no, one end, the other end)
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self.failed: list[tuple[int, str, str]] = []
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#: half width of each net routed wider than the default (its class)
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@@ -127,6 +130,9 @@ class _Connection:
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"half",
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"stubs",
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"stub_near",
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"anchors",
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"copper",
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"seq",
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)
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def __init__(self, index: int, net_no: int, a: Pin, b: Pin) -> None:
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@@ -158,6 +164,14 @@ class _Connection:
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# routed at the default width instead; the half width it went in at
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self.narrow = False
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self.half = 0
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# connections whose copper this one ended on (a T into its net's
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# tree): ripping one of them leaves this one dangling
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self.anchors: frozenset[int] = frozenset()
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# the nodes of its committed copper (path cells, via cells on every
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# layer), where another connection of its net may end
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self.copper: frozenset[Node] = frozenset()
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# commit order: a connection is always committed after its anchors
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self.seq = 0
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class GridRouter:
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@@ -188,8 +202,17 @@ class GridRouter:
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net_widths: dict[int, int] | None = None,
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via_drill: int | None = None,
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hole_to_hole: int = 0,
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tree_nets: bool = True,
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) -> None:
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self.board = board
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# Multi-pin nets: pair a net's pin groups by a minimum spanning tree,
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# and let a connection start or end on copper its net already routed
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# (a T into the tree), not only on one chosen pin.
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self.tree = bool(tree_nets)
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self._dependents: dict[int, set[int]] = {}
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self._commits = 0
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self._plane_nets: set[int] = set()
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self._net_conns: dict[int, list[_Connection]] = {}
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# Pin access: while a pin still has connections to route, the cells
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# its route would leave by (its end cells, the via it may need there,
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# and the clearance around both) cost other nets this much extra, so
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@@ -699,6 +722,13 @@ class GridRouter:
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goal_cell = self._group_target(conn.a_group)
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starts = self._group_ends(conn.a_group, conn.net_no, conns, allow_ripup)
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goals = self._group_ends(conn.b_group, conn.net_no, conns, allow_ripup)
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# either side may also start or end on copper its net already routed
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a_tree = self._tree_ends(conn, conn.a_group)
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b_tree = self._tree_ends(conn, conn.b_group)
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for node in a_tree:
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starts.setdefault(node, None)
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for node in b_tree:
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goals.setdefault(node, None)
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if not starts or not goals:
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return None
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# A start that is already an end joins at once, except that ending on
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@@ -711,6 +741,7 @@ class GridRouter:
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]
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if common:
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conn.a_end, conn.b_end = starts[common[0]], goals[common[0]]
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conn.anchors = _anchors([common[0]], starts, goals, a_tree, b_tree)
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return [common[0]]
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net_no = conn.net_no
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@@ -776,6 +807,7 @@ class GridRouter:
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if ok:
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path = _reconstruct(came_from, current)
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conn.a_end, conn.b_end = starts.get(path[0]), end
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conn.anchors = _anchors(path, starts, goals, a_tree, b_tree)
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return path
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cx, cy, cl = current
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base = g_score[current]
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@@ -822,6 +854,49 @@ class GridRouter:
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)
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return None
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def _tree_ends(self, conn: _Connection, group) -> dict[Node, int]:
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"""Copper its net has already routed on ``group``'s side of ``conn``,
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each node mapped to the connection that laid it: a route may start or
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end anywhere on it. Empty for plane nets, which keep their drops to
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the plane, and when tree routing is off."""
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if not self.tree or conn.net_no in self._plane_nets:
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return {}
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adjacent: dict[int, list[tuple[int, _Connection]]] = {}
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for c in self._net_conns.get(conn.net_no, ()):
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if c is conn or not c.routed:
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continue
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a, b = id(c.a_group), id(c.b_group)
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adjacent.setdefault(a, []).append((b, c))
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adjacent.setdefault(b, []).append((a, c))
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owners: dict[Node, int] = {}
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seen = {id(group)}
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stack = [id(group)]
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while stack:
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for other, c in adjacent.get(stack.pop(), ()):
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for node in c.copper:
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# a walled cell's via moved into the pad: no copper there
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if node not in self._keepout and node not in self._via_only:
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owners.setdefault(node, c.index)
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if other not in seen:
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seen.add(other)
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stack.append(other)
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return owners
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def _with_dependents(self, victims: list[_Connection], conns: list[_Connection]) -> list[_Connection]:
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"""``victims`` and every routed connection that ended on their copper,
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directly or through another: ripping a route rips the routes teed onto
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it, which would otherwise dangle. Anchors come before what hangs on
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them, as they were committed."""
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found = {v.index: v for v in victims}
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stack = list(victims)
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while stack:
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for i in self._dependents.get(stack.pop().index, ()):
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c = conns[i]
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if c.routed and i not in found:
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found[i] = c
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stack.append(c)
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return sorted(found.values(), key=lambda c: (c.seq, c.index))
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# --- pin stubs ----------------------------------------------------------
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# A pin rarely sits on a cell centre, so every route starts and ends with a
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# short stub from the pin to its first cell. The grid has to see that
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@@ -1431,6 +1506,13 @@ class GridRouter:
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# via k joins wire segments k and k + 1
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conn.vias[0 if idx == 0 else idx - 1] = location
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conn.routed = True
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self._commits += 1
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conn.seq = self._commits
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conn.copper = frozenset(path) | frozenset(
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(*cell, layer) for cell in conn.via_cells for layer in self.layers
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)
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for anchor in conn.anchors:
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self._dependents.setdefault(anchor, set()).add(conn.index)
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self._settle(conn, -1)
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def _forget_stubs(self, conn: _Connection) -> None:
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@@ -1473,6 +1555,12 @@ class GridRouter:
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conn.wires = []
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conn.vias = []
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conn.routed = False
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for anchor in conn.anchors:
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hanging = self._dependents.get(anchor)
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if hanging is not None:
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hanging.discard(conn.index)
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conn.anchors = frozenset()
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conn.copper = frozenset()
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conn.rip_count += 1
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self._settle(conn, +1)
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@@ -1688,7 +1776,7 @@ class GridRouter:
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crossed |= self._stub_owners(
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end, node[:2], node[2], conn.net_no, conns, self._conn_half(conn)
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)
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victims = [conns[i] for i in sorted(crossed)]
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victims = self._with_dependents([conns[i] for i in sorted(crossed)], conns)
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if self.rollback:
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return self._ripup_transaction(conn, path, victims, conns)
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for victim in victims:
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@@ -1699,7 +1787,7 @@ class GridRouter:
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def _ripup_transaction(self, conn, path, victims, conns) -> bool:
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"""Route ``conn`` through ``victims``, reroute them at once in free
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space, and undo it all if fewer connections end up routed."""
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saved = [(v, v.path, v.a_end, v.b_end, v.rip_count) for v in victims]
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saved = [(v, v.path, v.a_end, v.b_end, v.rip_count, v.anchors) for v in victims]
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own_rips = conn.rip_count
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for victim in victims:
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self._rip(victim)
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@@ -1717,8 +1805,8 @@ class GridRouter:
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self._rip(victim)
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self._rip(conn)
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conn.rip_count = own_rips
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for victim, old_path, a_end, b_end, rips in saved:
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victim.a_end, victim.b_end = a_end, b_end
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for victim, old_path, a_end, b_end, rips, anchors in saved:
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victim.a_end, victim.b_end, victim.anchors = a_end, b_end, anchors
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self._commit(victim, old_path)
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victim.rip_count = rips
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return False
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@@ -1740,6 +1828,7 @@ class GridRouter:
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planes_by_net.setdefault(zone.net_nos[0], []).append(zone)
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plane_ids = frozenset(id(z) for zs in planes_by_net.values() for z in zs)
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conns: list[_Connection] = []
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self._plane_nets: set[int] = set()
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nets = set(pins_by_net) | set(zones_by_net) | set(planes_by_net)
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# deterministic: fewer-pin nets first, then by net number
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for net_no in sorted(nets, key=lambda n: (len(pins_by_net.get(n, [])), n)):
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@@ -1752,12 +1841,18 @@ class GridRouter:
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# a plane net: every other group goes straight to the plane
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# (usually a stub and a via), not pad to pad across the board
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pairs = [(g, hubs[0]) for g in groups if g is not hubs[0]]
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self._plane_nets.add(net_no)
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elif self.tree:
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pairs = _spanning_pairs(groups)
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else:
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pairs = list(zip(groups, groups[1:], strict=False))
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for ga, gb in pairs:
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conn = _Connection(len(conns), net_no, _first(ga[0]), _first(gb[0]))
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conn.a_group, conn.b_group = ga, gb
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conns.append(conn)
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self._net_conns: dict[int, list[_Connection]] = {}
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for conn in conns:
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self._net_conns.setdefault(conn.net_no, []).append(conn)
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return conns
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def _fixed_pieces(self, net_no: int) -> list[_FixedPiece]:
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@@ -1807,18 +1902,22 @@ class GridRouter:
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return wide, narrowed
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def _snapshot(self, conns: list[_Connection]) -> list[tuple]:
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# in commit order, so a connection teed onto another comes after it;
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# its anchors as positions in this list
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routed = sorted((c for c in conns if c.routed), key=lambda c: (c.seq, c.index))
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position = {c.index: i for i, c in enumerate(routed)}
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return [
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(c.net_no, [(layer, list(pts)) for layer, pts in c.wires], list(c.vias),
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(*_ends_of(c), self._left_to_zone(c)))
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for c in conns
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if c.routed
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(*_ends_of(c), self._left_to_zone(c)),
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tuple(sorted(position[a] for a in c.anchors if a in position)))
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for c in routed
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]
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def _result_from(self, snapshot, unrouted: int) -> RouteResult:
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result = RouteResult(self.half_width)
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written: set[tuple[int, IntPoint]] = set()
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result.unrouted = unrouted
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for net_no, wires, vias, ends in snapshot:
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for net_no, wires, vias, ends, anchors in snapshot:
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for layer, points in wires:
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result.add_wire(net_no, layer, points)
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for location in vias:
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@@ -1829,7 +1928,8 @@ class GridRouter:
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result.add_via(net_no, location)
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result.connections.append((net_no, wires, vias))
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result.connection_ends.append(ends)
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routed = {ends[:2] + (net_no,) for net_no, _w, _v, ends in snapshot}
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result.connection_anchors.append(anchors)
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routed = {ends[:2] + (net_no,) for net_no, _w, _v, ends, _a in snapshot}
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result.failed = [
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(c.net_no, *_ends_of(c), self._left_to_zone(c))
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for c in self._conns
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@@ -1842,6 +1942,52 @@ def _first(items):
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return items[0] if items else None
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def _anchors(path, starts, goals, a_tree, b_tree) -> frozenset[int]:
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"""The connections whose copper a found path starts or ends on."""
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found = set()
|
||||
if starts.get(path[0]) is None and path[0] in a_tree:
|
||||
found.add(a_tree[path[0]])
|
||||
if goals.get(path[-1]) is None and path[-1] in b_tree:
|
||||
found.add(b_tree[path[-1]])
|
||||
return frozenset(found)
|
||||
|
||||
|
||||
def _group_points(group) -> list[tuple[int, int]]:
|
||||
pins, zones = group
|
||||
if pins:
|
||||
return [(p.location.x, p.location.y) for p in pins]
|
||||
points = []
|
||||
for zone in zones:
|
||||
box = zone.bounding_box()
|
||||
points.append(((box.ll.x + box.ur.x) // 2, (box.ll.y + box.ur.y) // 2))
|
||||
return points or [(0, 0)]
|
||||
|
||||
|
||||
def _spanning_pairs(groups) -> list[tuple]:
|
||||
"""A minimum spanning tree over a net's groups (Prim, Manhattan distance
|
||||
between their nearest pins), as (in the tree, joining it) pairs: each
|
||||
connection joins the nearest group not yet joined, not the next in pin
|
||||
order."""
|
||||
if len(groups) < 2:
|
||||
return []
|
||||
points = [_group_points(g) for g in groups]
|
||||
|
||||
def gap(i: int, j: int) -> int:
|
||||
return min(abs(ax - bx) + abs(ay - by) for ax, ay in points[i] for bx, by in points[j])
|
||||
|
||||
best = {j: (gap(0, j), 0) for j in range(1, len(groups))}
|
||||
pairs = []
|
||||
while best:
|
||||
j = min(best, key=lambda k: (best[k][0], k))
|
||||
_, i = best.pop(j)
|
||||
pairs.append((groups[i], groups[j]))
|
||||
for k in best:
|
||||
d = gap(j, k)
|
||||
if d < best[k][0]:
|
||||
best[k] = (d, j)
|
||||
return pairs
|
||||
|
||||
|
||||
def _group_label(group) -> str:
|
||||
pins, zones = group
|
||||
parts = [f"{p.component_ref}-{p.name}" for p in pins[:3]]
|
||||
@@ -2039,6 +2185,7 @@ def route_board(
|
||||
access_cost: float = 0.0,
|
||||
negotiate: int = 0,
|
||||
rollback: bool = True,
|
||||
tree_nets: bool = True,
|
||||
net_widths: dict[int, int] | None = None,
|
||||
via_drill: int | None = None,
|
||||
hole_to_hole: int = 0,
|
||||
@@ -2062,6 +2209,7 @@ def route_board(
|
||||
access_cost=access_cost,
|
||||
negotiate=negotiate,
|
||||
rollback=rollback,
|
||||
tree_nets=tree_nets,
|
||||
net_widths=net_widths,
|
||||
via_drill=via_drill,
|
||||
hole_to_hole=hole_to_hole,
|
||||
|
||||
@@ -121,6 +121,7 @@ def route_dsn_board(
|
||||
negotiate: int = 0,
|
||||
hole_to_hole_mm: float = 0.25,
|
||||
rollback: bool = True,
|
||||
tree_nets: bool = True,
|
||||
) -> tuple[RouteResult, int, list[str]]:
|
||||
"""Route a parsed :class:`DsnBoard`; return the board-unit result, the scale,
|
||||
and the layer names. ``layers`` restricts routing to those signal-layer
|
||||
@@ -146,6 +147,7 @@ def route_dsn_board(
|
||||
access_cost=access_cost,
|
||||
negotiate=negotiate,
|
||||
rollback=rollback,
|
||||
tree_nets=tree_nets,
|
||||
net_widths=_net_widths_board(dsn, scale),
|
||||
via_drill=_via_drill_board(dsn, scale),
|
||||
hole_to_hole=_mm_to_board(dsn, scale, hole_to_hole_mm) or 0,
|
||||
@@ -201,6 +203,7 @@ def build_routing_result(
|
||||
negotiate: int = 0,
|
||||
hole_to_hole_mm: float = 0.25,
|
||||
rollback: bool = True,
|
||||
tree_nets: bool = True,
|
||||
) -> RoutingResult:
|
||||
"""Route ``dsn`` (grid track) and convert to a DSN-unit RoutingResult."""
|
||||
route, scale, layer_names = route_dsn_board(
|
||||
@@ -211,6 +214,7 @@ def build_routing_result(
|
||||
negotiate=negotiate,
|
||||
hole_to_hole_mm=hole_to_hole_mm,
|
||||
rollback=rollback,
|
||||
tree_nets=tree_nets,
|
||||
)
|
||||
return _to_routing_result(route, dsn, scale, layer_names)
|
||||
|
||||
@@ -232,6 +236,7 @@ def route_dsn_board_exact(
|
||||
negotiate: int = 0,
|
||||
hole_to_hole_mm: float = 0.25,
|
||||
rollback: bool = True,
|
||||
tree_nets: bool = True,
|
||||
) -> tuple[ExactRouteResult, int, list[str]]:
|
||||
"""Route a parsed :class:`DsnBoard` with the exact-geometry (orthogonal,
|
||||
DRC-verified) track; return the exact result, the scale, and layer names.
|
||||
@@ -261,6 +266,7 @@ def route_dsn_board_exact(
|
||||
access_cost=access_cost,
|
||||
negotiate=negotiate,
|
||||
rollback=rollback,
|
||||
tree_nets=tree_nets,
|
||||
net_widths=_net_widths_board(dsn, scale),
|
||||
via_drill=_via_drill_board(dsn, scale),
|
||||
hole_to_hole=_mm_to_board(dsn, scale, hole_to_hole_mm) or 0,
|
||||
@@ -285,6 +291,7 @@ def build_exact_routing_result(
|
||||
negotiate: int = 0,
|
||||
hole_to_hole_mm: float = 0.25,
|
||||
rollback: bool = True,
|
||||
tree_nets: bool = True,
|
||||
) -> RoutingResult:
|
||||
"""Route ``dsn`` (exact track) and convert to a DSN-unit RoutingResult."""
|
||||
exact, scale, layer_names = route_dsn_board_exact(
|
||||
@@ -303,6 +310,7 @@ def build_exact_routing_result(
|
||||
negotiate=negotiate,
|
||||
hole_to_hole_mm=hole_to_hole_mm,
|
||||
rollback=rollback,
|
||||
tree_nets=tree_nets,
|
||||
)
|
||||
return _to_routing_result(exact.result, dsn, scale, layer_names)
|
||||
|
||||
|
||||
@@ -0,0 +1,141 @@
|
||||
"""Multi-pin nets: spanning-tree pairs, and connections that end on copper
|
||||
their net has already routed (a T into the tree)."""
|
||||
|
||||
from __future__ import annotations
|
||||
|
||||
import pytest
|
||||
|
||||
from freeroute.board import build_board
|
||||
from freeroute.dsn import parse_dsn
|
||||
from freeroute.route import exact_router
|
||||
from freeroute.route.grid_router import GridRouter, RouteResult
|
||||
from freeroute.route.pipeline import _rule_clearance_dsn, _rule_width_dsn
|
||||
|
||||
# P1 and P2 are nearest each other, so the tree pairs them first; P3 sits
|
||||
# under the middle of that leg, 50 mm below it and 90 mm from either pin.
|
||||
TEE = """(pcb "tee.dsn"
|
||||
(parser (string_quote ") (space_in_quoted_tokens on) (host_cad "t") (host_version "1"))
|
||||
(resolution um 10)
|
||||
(unit um)
|
||||
(structure
|
||||
(layer F.Cu (type signal) (property (index 0)))
|
||||
(boundary (path pcb 0 0 0 200000 0 200000 -100000 0 -100000 0 0))
|
||||
(rule (width 2000) (clearance 2000))
|
||||
)
|
||||
(library
|
||||
(padstack Rect_Pad (shape (rect F.Cu -1000 -1000 1000 1000)) (attach off))
|
||||
(image PAD (pin Rect_Pad 1 0 0))
|
||||
)
|
||||
(placement
|
||||
(component PAD
|
||||
(place P1 60000 -20000 front 0)
|
||||
(place P2 140000 -20000 front 0)
|
||||
(place P3 100000 -70000 front 0)
|
||||
)
|
||||
)
|
||||
(network
|
||||
(net N (pins P1-1 P2-1 P3-1))
|
||||
(class default (rule (width 2000) (clearance 2000)))
|
||||
)
|
||||
(wiring)
|
||||
)
|
||||
"""
|
||||
|
||||
|
||||
def _router(tree_nets=True, text=TEE):
|
||||
dsn = parse_dsn(text)
|
||||
s = dsn.resolution.value
|
||||
return GridRouter(
|
||||
build_board(dsn),
|
||||
trace_width=round(_rule_width_dsn(dsn) * s),
|
||||
clearance=round(_rule_clearance_dsn(dsn) * s),
|
||||
orthogonal=True,
|
||||
tree_nets=tree_nets,
|
||||
)
|
||||
|
||||
|
||||
def test_pairs_follow_a_spanning_tree_not_the_pin_order():
|
||||
router = _router()
|
||||
conns = router._build_connections()
|
||||
pairs = [(c.a.component_ref, c.b.component_ref) for c in conns]
|
||||
assert pairs == [("P1", "P2"), ("P1", "P3")]
|
||||
chain = _router(tree_nets=False)._build_connections()
|
||||
assert [(c.a.component_ref, c.b.component_ref) for c in chain] == [("P1", "P2"), ("P2", "P3")]
|
||||
|
||||
|
||||
def test_the_third_pin_tees_into_the_first_leg():
|
||||
router = _router()
|
||||
result = router.route()
|
||||
first, second = router._conns
|
||||
assert result.unrouted == 0
|
||||
# the second connection starts on the first one's copper, mid-leg
|
||||
start = second.path[0]
|
||||
assert start in first.copper and second.a_end is None
|
||||
assert second.anchors == {first.index}
|
||||
assert router._dependents[first.index] == {second.index}
|
||||
assert abs(router._cell_center(start[:2]).x - 1_000_000) <= router.step
|
||||
# and so its copper is the 50 mm drop, not 90 mm back to a pin
|
||||
assert len(second.path) < len(router._conns[0].path)
|
||||
|
||||
|
||||
def test_without_trees_each_connection_ends_on_a_pin():
|
||||
router = _router(tree_nets=False)
|
||||
router.route()
|
||||
assert all(c.anchors == frozenset() for c in router._conns)
|
||||
assert all(c.a_end is not None and c.b_end is not None for c in router._conns)
|
||||
|
||||
|
||||
def test_ripping_an_anchor_takes_what_hangs_on_it():
|
||||
router = _router()
|
||||
router.route()
|
||||
first, second = router._conns
|
||||
victims = router._with_dependents([first], router._conns)
|
||||
assert victims == [first, second] # anchors first, as committed
|
||||
for victim in victims:
|
||||
router._rip(victim)
|
||||
assert not first.routed and not second.routed
|
||||
assert not router._dependents.get(first.index)
|
||||
assert not router._cell_owner
|
||||
|
||||
|
||||
def test_the_snapshot_lists_anchors_before_what_hangs_on_them():
|
||||
router = _router()
|
||||
result = router.route()
|
||||
assert result.connection_anchors == [(), (0,)]
|
||||
|
||||
|
||||
def test_the_exact_engine_drops_a_tee_whose_anchor_it_rejects(monkeypatch):
|
||||
"""A connection teed onto copper the exact check refuses would dangle."""
|
||||
dsn = parse_dsn(TEE)
|
||||
board = build_board(dsn)
|
||||
real = exact_router.route_board
|
||||
|
||||
def grid_then_spoil(*args, **kwargs):
|
||||
result: RouteResult = real(*args, **kwargs)
|
||||
assert result.connection_anchors == [(), (0,)]
|
||||
# move the first leg off the board edge so the exact check rejects it
|
||||
net, wires, vias = result.connections[0]
|
||||
result.connections[0] = (net, [(layer, [type(p)(p.x, p.y + 2_000_000) for p in pts])
|
||||
for layer, pts in wires], vias)
|
||||
return result
|
||||
|
||||
monkeypatch.setattr(exact_router, "route_board", grid_then_spoil)
|
||||
s = dsn.resolution.value
|
||||
exact = exact_router.route_board_exact(
|
||||
board,
|
||||
trace_width=round(_rule_width_dsn(dsn) * s),
|
||||
clearance=round(_rule_clearance_dsn(dsn) * s),
|
||||
)
|
||||
assert len(exact.result.failed) == 2 # the leg and the T hanging on it
|
||||
assert not exact.result.wires
|
||||
|
||||
|
||||
@pytest.mark.parametrize("tree_nets", [True, False])
|
||||
def test_occupancy_stays_honest(tree_nets):
|
||||
router = _router(tree_nets)
|
||||
router.route()
|
||||
conns = router._conns
|
||||
assert all(conns[i].routed for i in router._cell_owner.values())
|
||||
for anchor, hanging in router._dependents.items():
|
||||
for i in hanging:
|
||||
assert conns[i].routed and conns[anchor].routed
|
||||
@@ -160,6 +160,7 @@ def test_cli_supported_combinations_are_accepted(tmp_path):
|
||||
"access": ["--access-cost", "5"],
|
||||
"negotiate": ["--negotiate", "2"],
|
||||
"rollback": ["--no-rollback"],
|
||||
"tree": ["--no-tree"],
|
||||
}
|
||||
for engine, options in ENGINE_OPTIONS.items():
|
||||
for option in options:
|
||||
|
||||
Reference in New Issue
Block a user