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Convert channel router to take netlist of pins rather than names.

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This commit is contained in:
Matt Guthaus
2018-11-29 12:12:10 -08:00
parent a7bc9e0de0
commit 4df862d8af
3 changed files with 100 additions and 93 deletions
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compiler/base/hierarchy_layout.py
+15 -16
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@@ -745,13 +745,14 @@ class layout(lef.lef):
self.add_wire(layer_stack, [pin.center(), mid, trunk_mid])
def create_channel_route(self, netlist, pins, offset,
layer_stack=("metal1", "via1", "metal2"), pitch=None,
def create_channel_route(self, netlist,
offset,
layer_stack=("metal1", "via1", "metal2"),
pitch=None,
vertical=False):
"""
The net list is a list of the nets. Each net is a list of pin
names to be connected. Pins is a dictionary of the pin names
to the pin structures. Offset is the lower-left of where the
The net list is a list of the nets. Each net is a list of pins
to be connected. Offset is the lower-left of where the
routing channel will start. This does NOT try to minimize the
number of tracks -- instead, it picks an order to avoid the
vertical conflicts between pins.
@@ -786,7 +787,10 @@ class layout(lef.lef):
def vcg_pin_overlap(pin1, pin2, vertical):
""" Check for vertical or horizontal overlap of the two pins """
# 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
# extra comparison *shouldn't* matter.
# Pin 1 must be in the "BOTTOM" set
x_overlap = pin1.by() < pin2.by() and abs(pin1.center().x-pin2.center().x)<pitch
@@ -815,10 +819,7 @@ class layout(lef.lef):
for pin_list in netlist:
net_name = "n{}".format(index)
index += 1
nets[net_name] = []
for pin_name in pin_list:
pin = pins[pin_name]
nets[net_name].append(pin)
nets[net_name] = pin_list
# Find the vertical pin conflicts
# FIXME: O(n^2) but who cares for now
@@ -868,23 +869,21 @@ class layout(lef.lef):
offset += vector(0,pitch)
def create_vertical_channel_route(self, netlist, pins, offset,
def create_vertical_channel_route(self, netlist, offset,
layer_stack=("metal1", "via1", "metal2"),
pitch=None):
"""
Wrapper to create a vertical channel route
"""
self.create_channel_route(netlist, pins, offset, layer_stack,
pitch, vertical=True)
self.create_channel_route(netlist, offset, layer_stack, pitch, vertical=True)
def create_horizontal_channel_route(self, netlist, pins, offset,
def create_horizontal_channel_route(self, netlist, offset,
layer_stack=("metal1", "via1", "metal2"),
pitch=None):
"""
Wrapper to create a horizontal channel route
"""
self.create_channel_route(netlist, pins, offset,
layer_stack, pitch, vertical=False)
self.create_channel_route(netlist, offset, layer_stack, pitch, vertical=False)
def add_enclosure(self, insts, layer="nwell"):
""" Add a layer that surrounds the given instances. Useful