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Remove unused contact in pnor2

This commit is contained in:
mrg 2020-03-23 11:55:17 -07:00
parent 717cbb0fe5
commit f598a359d5
1 changed files with 30 additions and 20 deletions
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50
compiler/pgates/pnor2.py
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@ -73,33 +73,43 @@ class pnor2(pgate.pgate):
connect_active=True)
self.add_mod(self.nmos)
self.pmos = factory.create(module_type="ptx",
width=self.pmos_width,
mults=self.tx_mults,
tx_type="pmos",
connect_poly=True,
connect_active=True)
self.add_mod(self.pmos)
self.pmos_nd = factory.create(module_type="ptx",
width=self.pmos_width,
mults=self.tx_mults,
tx_type="pmos",
add_drain_contact=False,
connect_poly=True,
connect_active=True)
self.add_mod(self.pmos_nd)
self.pmos_ns = factory.create(module_type="ptx",
width=self.pmos_width,
mults=self.tx_mults,
tx_type="pmos",
add_source_contact=False,
connect_poly=True,
connect_active=True)
self.add_mod(self.pmos_ns)
def setup_layout_constants(self):
""" Pre-compute some handy layout parameters. """
# metal spacing to allow contacts on any layer
self.input_spacing = max(self.poly_space + contact.poly_contact.first_layer_width,
self.m1_space + contact.m1_via.first_layer_width,
self.m2_space + contact.m2_via.first_layer_width,
self.m2_space + contact.m2_via.first_layer_width,
self.m3_space + contact.m2_via.second_layer_width)
# Compute the other pmos2 location, but determining
# offset to overlap the source and drain pins
self.overlap_offset = self.pmos.get_pin("D").ll() - self.pmos.get_pin("S").ll()
self.overlap_offset = self.pmos_ns.get_pin("D").ll() - self.pmos_nd.get_pin("S").ll()
# Two PMOS devices and a well contact. Separation between each.
# Enclosure space on the sides.
self.width = 2 * self.pmos.active_width \
+ self.pmos.active_contact.width \
+ 2 * self.active_space \
+ 0.5 * self.nwell_enclose_active
self.width = 2 * self.pmos_ns.active_width \
+ self.pmos_ns.active_contact.width \
+ 2 * self.active_space \
+ 0.5 * self.nwell_enclose_active
self.well_width = self.width + 2 * self.nwell_enclose_active
# Height is an input parameter, so it is not recomputed.
@ -107,7 +117,7 @@ class pnor2(pgate.pgate):
# to the active contacts
extra_contact_space = max(-self.nmos.get_pin("D").by(), 0)
# This is a poly-to-poly of a flipped cell
self.top_bottom_space = max(0.5 * self.m1_width + self.m1_space + extra_contact_space,
self.top_bottom_space = max(0.5 * self.m1_width + self.m1_space + extra_contact_space,
self.poly_extend_active,
self.poly_space)
@ -130,11 +140,11 @@ class pnor2(pgate.pgate):
"""
self.pmos1_inst = self.add_inst(name="pnor2_pmos1",
mod=self.pmos)
mod=self.pmos_nd)
self.connect_inst(["vdd", "A", "net1", "vdd"])
self.pmos2_inst = self.add_inst(name="pnor2_pmos2",
mod=self.pmos)
mod=self.pmos_ns)
self.connect_inst(["net1", "B", "Z", "vdd"])
self.nmos1_inst = self.add_inst(name="pnor2_nmos1",
@ -151,15 +161,15 @@ class pnor2(pgate.pgate):
to provide maximum routing in channel
"""
pmos1_pos = vector(self.pmos.active_offset.x,
self.height - self.pmos.active_height \
pmos1_pos = vector(self.pmos_ns.active_offset.x,
self.height - self.pmos_ns.active_height \
- self.top_bottom_space)
self.pmos1_inst.place(pmos1_pos)
self.pmos2_pos = pmos1_pos + self.overlap_offset
self.pmos2_inst.place(self.pmos2_pos)
nmos1_pos = vector(self.pmos.active_offset.x, self.top_bottom_space)
nmos1_pos = vector(self.pmos_ns.active_offset.x, self.top_bottom_space)
self.nmos1_inst.place(nmos1_pos)
self.nmos2_pos = nmos1_pos + self.overlap_offset
@ -172,7 +182,7 @@ class pnor2(pgate.pgate):
def add_well_contacts(self):
""" Add n/p well taps to the layout and connect to supplies """
self.add_nwell_contact(self.pmos, self.pmos2_pos)
self.add_nwell_contact(self.pmos_ns, self.pmos2_pos)
self.add_pwell_contact(self.nmos, self.nmos2_pos)
def connect_rails(self):