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Fix pitch in channel router to support M3/M4.

This commit is contained in:
Matt Guthaus 2019-08-21 15:32:49 -07:00
parent 980760b724
commit 9ada9a7dfa
1 changed files with 27 additions and 18 deletions
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45
compiler/base/hierarchy_layout.py
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@ -680,7 +680,19 @@ class layout():
self.add_via_center(layers=layer_stack, self.add_via_center(layers=layer_stack,
offset=bus_pos, offset=bus_pos,
rotate=90) rotate=90)
def get_layer_pitch(self, layer):
""" Return the track pitch on a given layer """
if layer=="metal1":
return self.m1_pitch
elif layer=="metal2":
return self.m2_pitch
elif layer=="metal3":
return self.m3_pitch
elif layer=="metal4":
return self.m4_pitch
else:
debug.error("Cannot find layer pitch.")
def add_horizontal_trunk_route(self, def add_horizontal_trunk_route(self,
pins, pins,
trunk_offset, trunk_offset,
@ -690,7 +702,7 @@ class layout():
Create a trunk route for all pins with the trunk located at the given y offset. Create a trunk route for all pins with the trunk located at the given y offset.
""" """
if not pitch: if not pitch:
pitch = self.m1_pitch pitch = self.get_layer_pitch(layer_stack[0])
max_x = max([pin.center().x for pin in pins]) max_x = max([pin.center().x for pin in pins])
min_x = min([pin.center().x for pin in pins]) min_x = min([pin.center().x for pin in pins])
@ -728,7 +740,7 @@ class layout():
Create a trunk route for all pins with the trunk located at the given x offset. Create a trunk route for all pins with the trunk located at the given x offset.
""" """
if not pitch: if not pitch:
pitch = self.m2_pitch pitch = self.get_layer_pitch(layer_stack[2])
max_y = max([pin.center().y for pin in pins]) max_y = max([pin.center().y for pin in pins])
min_y = min([pin.center().y for pin in pins]) min_y = min([pin.center().y for pin in pins])
@ -762,7 +774,6 @@ class layout():
def create_channel_route(self, netlist, def create_channel_route(self, netlist,
offset, offset,
layer_stack=("metal1", "via1", "metal2"), layer_stack=("metal1", "via1", "metal2"),
pitch=None,
vertical=False): vertical=False):
""" """
The net list is a list of the nets. Each net is a list of pins The net list is a list of the nets. Each net is a list of pins
@ -786,7 +797,7 @@ class layout():
g[other_pin]=conflicts g[other_pin]=conflicts
return g return g
def vcg_nets_overlap(net1, net2, vertical): def vcg_nets_overlap(net1, net2, vertical, pitch):
""" """
Check all the pin pairs on two nets and return a pin Check all the pin pairs on two nets and return a pin
overlap if any pin overlaps overlap if any pin overlaps
@ -794,12 +805,12 @@ class layout():
for pin1 in net1: for pin1 in net1:
for pin2 in net2: for pin2 in net2:
if vcg_pin_overlap(pin1, pin2, vertical): if vcg_pin_overlap(pin1, pin2, vertical, pitch):
return True return True
return False return False
def vcg_pin_overlap(pin1, pin2, vertical): def vcg_pin_overlap(pin1, pin2, vertical, pitch):
""" Check for vertical or horizontal overlap of the two pins """ """ Check for vertical or horizontal overlap of the two pins """
# FIXME: If the pins are not in a row, this may break. # FIXME: If the pins are not in a row, this may break.
# However, a top pin shouldn't overlap another top pin, for example, so the # However, a top pin shouldn't overlap another top pin, for example, so the
@ -813,10 +824,10 @@ class layout():
overlaps = (not vertical and x_overlap) or (vertical and y_overlap) overlaps = (not vertical and x_overlap) or (vertical and y_overlap)
return overlaps return overlaps
if vertical:
pitch = self.get_layer_pitch(layer_stack[2])
if not pitch: else:
pitch = self.m2_pitch pitch = self.get_layer_pitch(layer_stack[0])
# FIXME: Must extend this to a horizontal conflict graph too if we want to minimize the # FIXME: Must extend this to a horizontal conflict graph too if we want to minimize the
@ -846,7 +857,7 @@ class layout():
# Skip yourself # Skip yourself
if net_name1 == net_name2: if net_name1 == net_name2:
continue continue
if vcg_nets_overlap(nets[net_name1], nets[net_name2], vertical): if vcg_nets_overlap(nets[net_name1], nets[net_name2], vertical, pitch):
vcg[net_name2].append(net_name1) vcg[net_name2].append(net_name1)
# list of routes to do # list of routes to do
@ -882,20 +893,18 @@ class layout():
def create_vertical_channel_route(self, netlist, offset, def create_vertical_channel_route(self, netlist, offset,
layer_stack=("metal1", "via1", "metal2"), layer_stack=("metal1", "via1", "metal2")):
pitch=None):
""" """
Wrapper to create a vertical channel route Wrapper to create a vertical channel route
""" """
self.create_channel_route(netlist, offset, layer_stack, pitch, vertical=True) self.create_channel_route(netlist, offset, layer_stack, vertical=True)
def create_horizontal_channel_route(self, netlist, offset, def create_horizontal_channel_route(self, netlist, offset,
layer_stack=("metal1", "via1", "metal2"), layer_stack=("metal1", "via1", "metal2")):
pitch=None):
""" """
Wrapper to create a horizontal channel route Wrapper to create a horizontal channel route
""" """
self.create_channel_route(netlist, offset, layer_stack, pitch, vertical=False) self.create_channel_route(netlist, offset, layer_stack, vertical=False)
def add_boundary(self, offset=vector(0,0)): def add_boundary(self, offset=vector(0,0)):
""" Add boundary for debugging dimensions """ """ Add boundary for debugging dimensions """