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sky130 dp bank passing
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Jesse Cirimelli-Low
@@ -1368,6 +1368,142 @@ class layout():
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return via
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def compute_min_area_rect_dims(self, layer, width, height):
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"""
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Return ``(width, height)`` after the same min-area expansion as
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``add_min_area_rect_center`` (no geometry added). If ``minarea`` for
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``layer`` is zero, returns ``(width, height)`` unchanged.
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"""
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min_area = drc("minarea_{}".format(layer))
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if min_area == 0:
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return width, height
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min_width = drc("minwidth_{}".format(layer))
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if preferred_directions[layer] == "V":
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new_height = ceil(max(min_area / width, min_width))
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new_width = width
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else:
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new_width = ceil(max(min_area / height, min_width))
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new_height = height
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debug.check(min_area <= round_to_grid(new_height * new_width), "Min area violated.")
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return new_width, new_height
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def via_stack_metal_extent_after_min_area(self,
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from_layer,
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to_layer,
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directions,
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metal_layer,
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horizontal_extent,
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size=(1, 1)):
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"""
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Horizontal span (if ``horizontal_extent``) or vertical span of
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``metal_layer`` patches that ``add_via_stack_center`` would produce on
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that layer: the hop's contact ``first_layer`` size, plus
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``compute_min_area_rect_dims`` when ``add_via_stack_center`` would call
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``add_min_area_rect_center`` for that hop (intermediate routing metal).
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``directions`` and ``size`` match ``add_via_stack_center`` / ``add_via_center``.
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Returns ``0.0`` if ``metal_layer`` is never the starting layer of a hop
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on the path from ``from_layer`` to ``to_layer``.
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"""
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if from_layer == to_layer:
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return 0.0
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intermediate_layers = self.get_metal_layers(from_layer, to_layer)
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best = 0.0
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cur_layer = from_layer
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while cur_layer != to_layer:
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from_id = tech_layer_indices[cur_layer]
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to_id = tech_layer_indices[to_layer]
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if from_id < to_id:
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search_id = 0
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next_id = 2
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else:
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search_id = 2
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next_id = 0
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curr_stack = next(filter(lambda stack: stack[search_id] == cur_layer, tech_layer_stacks), None)
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if curr_stack is None:
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debug.error("via_stack_metal_extent_after_min_area: no stack for {} toward {}".format(cur_layer, to_layer), -1)
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via_mod = factory.create(module_type="contact",
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layer_stack=curr_stack,
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dimensions=size,
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directions=directions,
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implant_type=None,
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well_type=None)
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if cur_layer == metal_layer:
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fw = via_mod.first_layer_width
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fh = via_mod.first_layer_height
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if cur_layer in intermediate_layers:
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nw, nh = self.compute_min_area_rect_dims(cur_layer, fw, fh)
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else:
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nw, nh = fw, fh
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cand = nw if horizontal_extent else nh
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best = max(best, cand)
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cur_layer = curr_stack[next_id]
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return best
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def via_stack_metal_layer_extent_parallel_to_rail(self,
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from_layer,
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to_layer,
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directions,
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metal_layer,
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parallel_along_y,
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size=(1, 1)):
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"""
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Span along the rail axis of ``metal_layer`` metal only (the hop where
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that layer is the contact first layer), including ``compute_min_area_rect_dims``
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when ``add_via_stack_center`` would add a min-area patch on that layer.
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Does **not** use the full contact cell bbox (which includes via cut layers).
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"""
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if from_layer == to_layer:
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return 0.0
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intermediate_layers = self.get_metal_layers(from_layer, to_layer)
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best = 0.0
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cur_layer = from_layer
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while cur_layer != to_layer:
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from_id = tech_layer_indices[cur_layer]
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to_id = tech_layer_indices[to_layer]
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if from_id < to_id:
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search_id = 0
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next_id = 2
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else:
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search_id = 2
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next_id = 0
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curr_stack = next(filter(lambda stack: stack[search_id] == cur_layer, tech_layer_stacks), None)
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if curr_stack is None:
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debug.error("via_stack_metal_layer_extent_parallel_to_rail: no stack for {} toward {}".format(cur_layer, to_layer), -1)
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via_mod = factory.create(module_type="contact",
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layer_stack=curr_stack,
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dimensions=size,
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directions=directions,
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implant_type=None,
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well_type=None)
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if cur_layer == metal_layer:
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fw = via_mod.first_layer_width
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fh = via_mod.first_layer_height
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if cur_layer in intermediate_layers:
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nw, nh = self.compute_min_area_rect_dims(cur_layer, fw, fh)
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else:
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nw, nh = fw, fh
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span = nh if parallel_along_y else nw
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best = max(best, span)
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cur_layer = curr_stack[next_id]
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return best
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def add_min_area_rect_center(self,
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layer,
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offset,
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@@ -1381,15 +1517,7 @@ class layout():
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if min_area == 0:
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return
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min_width = drc("minwidth_{}".format(layer))
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if preferred_directions[layer] == "V":
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new_height = ceil(max(min_area / width, min_width))
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new_width = width
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else:
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new_width = ceil(max(min_area / height, min_width))
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new_height = height
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debug.check(min_area <= round_to_grid(new_height*new_width), "Min area violated.")
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new_width, new_height = self.compute_min_area_rect_dims(layer, width, height)
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self.add_rect_center(layer=layer,
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offset=offset,
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