rsp2k
4a844e8cd7
The grid is laid out for the default width; a wider trace also needs the cells its extra half width reaches to be free, and claims a wider halo. A connection that does not fit at its class width (typically at a fine-pitch pin) is routed at the default instead and reported. A net is written at its class width when all of its connections went in at it, and the exact check verifies it at that width; nets that shove or the diagonal pass reshaped go out at the default.
43 lines
1.6 KiB
Python
43 lines
1.6 KiB
Python
"""Net classes wider than the default are routed at their width where it fits."""
|
|
|
|
from __future__ import annotations
|
|
|
|
from freeroute.dsn import parse_dsn
|
|
from freeroute.route.pipeline import build_exact_routing_result
|
|
|
|
_BOARD = """(pcb widths (parser) (resolution um 10) (unit um)
|
|
(structure
|
|
(layer F.Cu (type signal))
|
|
(boundary (path pcb 0 0 0 20000 0 20000 -10000 0 -10000 0 0))
|
|
{keepouts}
|
|
(rule (width 150) (clearance 150)))
|
|
(placement (component S (place P1 2000 -5000 front 0) (place P2 18000 -5000 front 0)))
|
|
(library (image S (pin pad 1 0 0)) (padstack pad (shape (rect F.Cu -600 -600 600 600)) (attach off)))
|
|
(network (net PWR (pins P1-1 P2-1))
|
|
(class Power PWR (rule (width 400) (clearance 150)))))"""
|
|
|
|
# two keepouts leave a 0.65 mm channel: room for 0.15 mm (0.45), not for 0.4 mm (0.7)
|
|
_CHANNEL = (
|
|
'(keepout "" (polygon F.Cu 0 9000 0 11000 0 11000 -4675 9000 -4675))\n'
|
|
' (keepout "" (polygon F.Cu 0 9000 -5325 11000 -5325 11000 -10000 9000 -10000))'
|
|
)
|
|
|
|
|
|
def _route(keepouts=""):
|
|
return build_exact_routing_result(parse_dsn(_BOARD.format(keepouts=keepouts)), resolution=2)
|
|
|
|
|
|
def test_a_wider_class_is_routed_and_written_at_its_width():
|
|
result = _route()
|
|
assert result.unrouted == [] and result.narrowed == []
|
|
widths = {w.width for net in result.nets for w in net.wires}
|
|
assert widths == {400.0}
|
|
|
|
|
|
def test_a_wider_class_that_does_not_fit_falls_back_to_the_default():
|
|
result = _route(_CHANNEL)
|
|
assert result.unrouted == []
|
|
assert [net for net, _a, _b in result.narrowed] == ["PWR"]
|
|
widths = {w.width for net in result.nets for w in net.wires}
|
|
assert widths == {150.0}
|