mirror of
https://github.com/VLSIDA/OpenRAM.git
synced 2026-09-05 01:01:33 +02:00
Improvements to power routing.
Improved the route horizontal and vertical pin functions to create a single pin at the end. Swapped A and B on wordline driver input for cleaner routing in most technologies. Fixed vertical supply routing in port_address.
This commit is contained in:
mrg
@@ -74,24 +74,30 @@ class layout():
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############################################################
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# GDS layout
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############################################################
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def offset_all_coordinates(self):
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def offset_all_coordinates(self, offset=None):
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"""
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This function is called after everything is placed to
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shift the origin in the lowest left corner
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"""
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offset = self.find_lowest_coords()
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self.translate_all(offset)
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return offset
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if not offset:
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offset = vector(0, 0)
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ll = self.find_lowest_coords()
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real_offset = ll + offset
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self.translate_all(real_offset)
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return real_offset
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def offset_x_coordinates(self):
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def offset_x_coordinates(self, offset=None):
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"""
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This function is called after everything is placed to
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shift the origin to the furthest left point.
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Y offset is unchanged.
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"""
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offset = self.find_lowest_coords()
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self.translate_all(offset.scale(1, 0))
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return offset
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if not offset:
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offset = vector(0, 0)
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ll = self.find_lowest_coords()
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real_offset = ll.scale(1, 0) + offset
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self.translate_all(real_offset)
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return real_offset
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def get_gate_offset(self, x_offset, height, inv_num):
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"""
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@@ -422,7 +428,7 @@ class layout():
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for pin_name in self.pin_map.keys():
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self.copy_layout_pin(instance, pin_name, prefix + pin_name)
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def route_vertical_pins(self, name, insts=None, layer=None, side=None):
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def route_vertical_pins(self, name, insts=None, layer=None, xside="cx", yside="cy"):
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"""
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Route together all of the pins of a given name that vertically align.
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Uses local_insts if insts not specified.
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@@ -437,19 +443,17 @@ class layout():
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for inst in insts:
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for pin in inst.get_pins(name):
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if side == "right":
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x = pin.rx()
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elif side == "left":
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x = pin.lx()
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else:
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x = pin.cx()
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x = getattr(pin, xside)()
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try:
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bins[x].append((inst,pin))
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except KeyError:
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bins[x] = [(inst,pin)]
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for x, v in bins.items():
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# Not enough to route a pin
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if len(v) < 2:
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continue
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bot_y = min([inst.by() for (inst,pin) in v])
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top_y = max([inst.uy() for (inst,pin) in v])
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@@ -459,9 +463,12 @@ class layout():
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pin_layer = layer
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else:
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pin_layer = self.supply_stack[2]
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y = getattr(pin, yside)()
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last_via = self.add_via_stack_center(from_layer=pin.layer,
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to_layer=pin_layer,
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offset=vector(x, pin.cy()),
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offset=vector(x, y),
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min_area=True)
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if last_via:
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@@ -469,13 +476,22 @@ class layout():
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else:
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via_width=None
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self.add_layout_pin_segment_center(text=name,
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layer=pin_layer,
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start=vector(x, bot_y),
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end=vector(x, top_y),
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width=via_width)
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top_pos = vector(x, top_y)
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bot_pos = vector(x, bot_y)
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self.add_segment_center(layer=pin_layer,
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start=bot_pos,
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end=top_pos,
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width=via_width)
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def route_horizontal_pins(self, name, insts=None, layer=None, side=None):
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self.add_layout_pin_rect_center(text=name,
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layer=pin_layer,
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offset=top_pos)
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# self.add_layout_pin_rect_center(text=name,
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# layer=pin_layer,
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# offset=bot_pos)
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def route_horizontal_pins(self, name, insts=None, layer=None, xside="cx", yside="cy"):
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"""
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Route together all of the pins of a given name that horizontally align.
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Uses local_insts if insts not specified.
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@@ -489,19 +505,20 @@ class layout():
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for inst in insts:
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for pin in inst.get_pins(name):
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if side == "top":
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y = pin.uy()
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elif side == "bottom":
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y = pin.by()
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else:
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y = pin.cy()
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y = getattr(pin, yside)()
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try:
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bins[y].append((inst,pin))
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except KeyError:
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bins[y] = [(inst,pin)]
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# Filter the small bins
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for y, v in bins.items():
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# Not enough to route a pin
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if len(v) < 2:
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continue
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left_x = min([inst.lx() for (inst,pin) in v])
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right_x = max([inst.rx() for (inst,pin) in v])
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@@ -511,6 +528,9 @@ class layout():
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pin_layer = layer
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else:
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pin_layer = self.supply_stack[0]
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x = getattr(pin, xside)()
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last_via = self.add_via_stack_center(from_layer=pin.layer,
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to_layer=pin_layer,
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offset=vector(pin.cx(), y),
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@@ -521,11 +541,19 @@ class layout():
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else:
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via_height=None
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self.add_layout_pin_segment_center(text=name,
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layer=pin_layer,
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start=vector(left_x, y),
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end=vector(right_x, y),
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width=via_height)
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left_pos = vector(left_x, y)
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right_pos = vector(right_x, y)
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self.add_segment_center(layer=pin_layer,
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start=left_pos,
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end=right_pos,
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width=via_height)
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self.add_layout_pin_rect_center(text=name,
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layer=pin_layer,
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offset=left_pos)
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# self.add_layout_pin_rect_center(text=name,
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# layer=pin_layer,
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# offset=right_pos)
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def add_layout_pin_segment_center(self, text, layer, start, end, width=None):
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"""
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