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More exact input spacing in pnand3

This commit is contained in:
mrg 2020-06-10 16:19:24 -07:00
parent 78c66d7c34
commit 0b4b5e7133
1 changed files with 14 additions and 5 deletions
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19
compiler/pgates/pnand3.py
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@ -12,7 +12,7 @@ from vector import vector
import logical_effort
from sram_factory import factory
from globals import OPTS
import contact
class pnand3(pgate.pgate):
"""
@ -209,12 +209,21 @@ class pnand3(pgate.pgate):
def route_inputs(self):
""" Route the A and B and C inputs """
# We can use this pitch because the contacts and overlap won't be adjacent
non_contact_pitch = 0.5 * self.m1_width + self.m1_space + 0.5 * contact.poly_contact.second_layer_height
pmos_drain_bottom = self.pmos1_inst.get_pin("D").by()
self.output_yoffset = pmos_drain_bottom - 0.5 * self.route_layer_width - self.route_layer_space
bottom_pin = self.nmos1_inst.get_pin("D")
self.inputA_yoffset = max(bottom_pin.uy() + self.m1_pitch,
self.nmos1_inst.uy() + self.poly_to_active)
# active contact metal to poly contact metal spacing
active_contact_to_poly_contact = bottom_pin.uy() + self.m1_space + 0.5 * contact.poly_contact.second_layer_height
# active diffusion to poly contact spacing
# doesn't use nmos uy because that is calculated using offset + poly height
active_to_poly_contact = self.nmos1_inst.by() + self.nmos1_inst.mod.active_height \
+ self.poly_to_active + 0.5 * contact.poly_contact.first_layer_height
self.inputA_yoffset = max(active_contact_to_poly_contact,
active_to_poly_contact)
self.route_input_gate(self.pmos1_inst,
self.nmos1_inst,
self.inputA_yoffset,
@ -222,14 +231,14 @@ class pnand3(pgate.pgate):
position="left")
# Put B right on the well line
self.inputB_yoffset = self.inputA_yoffset + self.m1_pitch
self.inputB_yoffset = self.inputA_yoffset + non_contact_pitch
self.route_input_gate(self.pmos2_inst,
self.nmos2_inst,
self.inputB_yoffset,
"B",
position="center")
self.inputC_yoffset = self.inputB_yoffset + self.m1_pitch
self.inputC_yoffset = self.inputB_yoffset + non_contact_pitch
self.route_input_gate(self.pmos3_inst,
self.nmos3_inst,
self.inputC_yoffset,