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fix bugs in channel routing, which will add strange shape in m2 at dff pins

This commit is contained in:
FriedrichWu 2024-10-31 09:43:34 +01:00
parent 61f5ff6ec4
commit 434063656f
1 changed files with 134 additions and 4 deletions
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138
compiler/base/channel_route.py
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@ -240,7 +240,7 @@ class channel_route(design):
current_offset = vector(real_channel_offset.x, real_channel_offset.y + 5) # make route out of dffs area
if self.layer_stack == self.m2_stack:
self.vertical_nonpref_pitch = self.horizontal_pitch
self.vertical_nonpref_pitch = self.horizontal_pitch + 0.1 # 0.1 make sure even if via at same col, fulfill m3-m3 spacing
if self.layer_stack == self.m1_stack:
current_offset = vector(real_channel_offset.x, current_offset.y + 14) # make sure no overlap between col_dffs & data_dffs
@ -270,9 +270,14 @@ class channel_route(design):
self.horizontal_pitch)
current_offset = vector(current_offset.x, net.max_value + self.horizontal_nonpref_pitch)
else:
self.add_horizontal_trunk_route(net.pins,
current_offset,
self.vertical_pitch)
if self.dff_area == True: # only use in dff channel routing
self.add_horizontal_trunk_with_jog(net.pins,
current_offset,
self.vertical_pitch)
else:
self.add_horizontal_trunk_route(net.pins,
current_offset,
self.vertical_pitch)
current_offset = vector(net.max_value + self.vertical_nonpref_pitch, current_offset.y)
# Remove the net from other constriants in the VCG
@ -321,7 +326,132 @@ class channel_route(design):
except AttributeError:
debug.error("Cannot find layer pitch.", -1)
return (nonpref_pitch, pitch, pitch - space, space)
def add_horizontal_trunk_with_jog(self,
pins,
trunk_offset,
pitch):
""" Special for connecting channel of dffs & bank, avoid too close with vdd pins """
max_x = max([pin.center().x for pin in pins])
min_x = min([pin.center().x for pin in pins])
min_y = min([pin.center().y for pin in pins])
# see the channel is at top or bottom
if min_y < 0: # port0, min_x need to change
min_x = min_x - 0.1 # in order to add jog at the dff pins, avoid overlap with vdd pins, left shift vertical line at dout pin
port = 0
else: # port1, max_x need to change
max_x = max_x - 0.1 # in order to add jog at the dff pins, avoid overlap with vdd pins, left shift vertical line at dout pin
port = 1
# if we are less than a pitch, just create a non-preferred layer jog
non_preferred_route = max_x - min_x <= pitch
half_layer_width = 0.5 * drc["minwidth_{0}".format(self.vertical_layer)]
if port == 0: # bottom need shift
if non_preferred_route:
# Add the horizontal trunk on the vertical layer!
self.add_path(self.vertical_layer,
[vector(min_x - half_layer_width, trunk_offset.y),
vector(max_x + half_layer_width, trunk_offset.y)])
# Route each pin to the trunk
for pin in pins:
if pin.cy() < trunk_offset.y:
pin_pos = pin.center()
mid = vector(pin_pos.x - 0.1, trunk_offset.y)
self.add_path(self.vertical_layer, [vector(pin.bc().x - 0.1, pin.bc().y), mid])
self.add_via_stack_center(from_layer=pin.layer,
to_layer=self.vertical_layer,
offset=pin_pos)
else:
pin_pos = pin.bc()
# No bend needed here
mid = vector(pin_pos.x, trunk_offset.y)
self.add_path(self.vertical_layer, [pin_pos, mid])
self.add_via_stack_center(from_layer=pin.layer,
to_layer=self.vertical_layer,
offset=pin.bc())
else:
# Add the horizontal trunk
self.add_path(self.horizontal_layer,
[vector(min_x, trunk_offset.y),
vector(max_x, trunk_offset.y)])
# Route each pin to the trunk
for pin in pins:
# Find the correct side of the pin
if pin.cy() < trunk_offset.y:
pin_pos = pin.center()
mid = vector(pin_pos.x - 0.1, trunk_offset.y)
self.add_path(self.vertical_layer, [vector(pin.bc().x - 0.1, pin.bc().y), mid])
self.add_via_center(layers=self.layer_stack,
offset=mid,
directions=self.directions)
self.add_via_stack_center(from_layer=pin.layer,
to_layer=self.vertical_layer,
offset=pin_pos)
else:
pin_pos = pin.bc()
mid = vector(pin_pos.x, trunk_offset.y)
self.add_path(self.vertical_layer, [pin_pos, mid])
self.add_via_center(layers=self.layer_stack,
offset=mid,
directions=self.directions)
self.add_via_stack_center(from_layer=pin.layer,
to_layer=self.vertical_layer,
offset=pin.bc())
else: # port 1, situation different, top need shift
if non_preferred_route:
# Add the horizontal trunk on the vertical layer!
self.add_path(self.vertical_layer,
[vector(min_x - half_layer_width, trunk_offset.y),
vector(max_x + half_layer_width, trunk_offset.y)])
# Route each pin to the trunk
for pin in pins:
if pin.cy() < trunk_offset.y:
pin_pos = pin.uc()
# No bend needed here
mid = vector(pin_pos.x, trunk_offset.y)
self.add_path(self.vertical_layer, [pin_pos, mid])
self.add_via_stack_center(from_layer=pin.layer,
to_layer=self.vertical_layer,
offset=pin.uc())
else:
pin_pos = pin.center()
mid = vector(pin_pos.x - 0.1, trunk_offset.y)
self.add_path(self.vertical_layer, [vector(pin.uc().x - 0.1, pin.uc().y), mid])
self.add_via_stack_center(from_layer=pin.layer,
to_layer=self.vertical_layer,
offset=pin_pos)
else:
# Add the horizontal trunk
self.add_path(self.horizontal_layer,
[vector(min_x, trunk_offset.y),
vector(max_x, trunk_offset.y)])
# Route each pin to the trunk
for pin in pins:
# Find the correct side of the pin
if pin.cy() < trunk_offset.y:
pin_pos = pin.uc()
mid = vector(pin_pos.x, trunk_offset.y)
self.add_path(self.vertical_layer, [pin_pos, mid])
self.add_via_center(layers=self.layer_stack,
offset=mid,
directions=self.directions)
self.add_via_stack_center(from_layer=pin.layer,
to_layer=self.vertical_layer,
offset=pin.uc())
else:
pin_pos = pin.center()
mid = vector(pin_pos.x - 0.1, trunk_offset.y)
self.add_path(self.vertical_layer, [vector(pin.uc().x - 0.1, pin.uc().y), mid])
self.add_via_center(layers=self.layer_stack,
offset=mid,
directions=self.directions)
self.add_via_stack_center(from_layer=pin.layer,
to_layer=self.vertical_layer,
offset=pin_pos)
def add_horizontal_trunk_route(self,
pins,
trunk_offset,