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Add metal1 gnd line to prevent DRC errors when sizing delay chain.

This commit is contained in:
Matt Guthaus 2018-02-07 14:15:13 -08:00
parent 3e4ef36efe
commit a2bf66b063
1 changed files with 12 additions and 2 deletions
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14
compiler/replica_bitline.py
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@ -239,12 +239,22 @@ class replica_bitline(design.design):
def route_gnd(self): def route_gnd(self):
""" Route all signals connected to gnd """ """ Route all signals connected to gnd """
# Add a rail in M1 from bottom to two along delay chain gnd_start = self.rbl_inv_inst.get_pin("gnd").bc()
gnd_start = self.rbl_inv_inst.get_pin("gnd").bc()
gnd_end = vector(gnd_start.x, self.rbl_inst.uy()+2*self.m2_pitch) gnd_end = vector(gnd_start.x, self.rbl_inst.uy()+2*self.m2_pitch)
# Add a rail in M1 from bottom of delay chain to two above the RBL
# This prevents DRC errors with vias for the WL
dc_top = self.dc_inst.ur()
self.add_segment_center(layer="metal1",
start=vector(gnd_start.x, dc_top.y),
end=gnd_end)
# Add a rail in M2 from RBL inverter to two above the RBL
self.add_segment_center(layer="metal2", self.add_segment_center(layer="metal2",
start=gnd_start, start=gnd_start,
end=gnd_end) end=gnd_end)
# Add pin from bottom to RBL inverter
self.add_layout_pin_center_segment(text="gnd", self.add_layout_pin_center_segment(text="gnd",
layer="metal1", layer="metal1",
start=gnd_start.scale(1,0), start=gnd_start.scale(1,0),