luke
/
OpenRAM
mirror of https://github.com/VLSIDA/OpenRAM.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
compiler/pgates/pnand3.py
View File

@ -12,7 +12,7 @@ from vector import vector
import logical_effort import logical_effort
from sram_factory import factory from sram_factory import factory
from globals import OPTS from globals import OPTS
import contact
class pnand3(pgate.pgate): class pnand3(pgate.pgate):
""" """
@ -209,12 +209,21 @@ class pnand3(pgate.pgate):
def route_inputs(self): def route_inputs(self):
""" Route the A and B and C inputs """ """ 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() 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 self.output_yoffset = pmos_drain_bottom - 0.5 * self.route_layer_width - self.route_layer_space
bottom_pin = self.nmos1_inst.get_pin("D") bottom_pin = self.nmos1_inst.get_pin("D")
self.inputA_yoffset = max(bottom_pin.uy() + self.m1_pitch, # active contact metal to poly contact metal spacing
self.nmos1_inst.uy() + self.poly_to_active) 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.route_input_gate(self.pmos1_inst,
self.nmos1_inst, self.nmos1_inst,
self.inputA_yoffset, self.inputA_yoffset,
@ -222,14 +231,14 @@ class pnand3(pgate.pgate):
position="left") position="left")
# Put B right on the well line # 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.route_input_gate(self.pmos2_inst,
self.nmos2_inst, self.nmos2_inst,
self.inputB_yoffset, self.inputB_yoffset,
"B", "B",
position="center") 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.route_input_gate(self.pmos3_inst,
self.nmos3_inst, self.nmos3_inst,
self.inputC_yoffset, self.inputC_yoffset,