Use layer instead of special flags for wells

compiler/pgates/pgate.py

@@ -8,7 +8,7 @@
 import contact
 import design
 import debug
-from tech import drc
+from tech import layers
 from vector import vector
 from globals import OPTS
 from sram_factory import factory
@@ -141,7 +141,7 @@ class pgate(design.design):
         max_y_offset = self.height + 0.5 * self.m1_width
         self.nwell_position = middle_position
         nwell_height = max_y_offset - middle_position.y
-        if drc("has_nwell"):
+        if layers["nwell"]:
             self.add_rect(layer="nwell",
                           offset=middle_position,
                           width=self.well_width,
@@ -153,7 +153,7 @@ class pgate(design.design):
 
         pwell_position = vector(0, -0.5 * self.m1_width)
         pwell_height = middle_position.y - pwell_position.y
-        if drc("has_pwell"):
+        if layers["pwell"]:
             self.add_rect(layer="pwell",
                           offset=pwell_position,
                           width=self.well_width,

compiler/pgates/ptx.py

@@ -152,7 +152,8 @@ class ptx(design.design):
         self.active_offset = vector([self.well_enclose_active] * 2)
 
         # Well enclosure of active, ensure minwidth as well
-        if drc("has_{}well".format(self.well_type)):
+        well_name = "{}well".format(self.well_type)
+        if layer[well_name]):
             self.cell_well_width = max(self.active_width + 2 * self.well_enclose_active,
                                        self.well_width)
             self.cell_well_height = max(self.tx_width + 2 * self.well_enclose_active,

technology/freepdk45/tech/tech.py

@@ -46,6 +46,7 @@ layer["thkox"]   = (8, 0)
 layer["poly"]    = (9, 0)
 layer["contact"] = (10, 0)
 layer["active_contact"] = (10, 0)
+layer["poly_contact"] = None
 layer["metal1"]  = (11, 0)
 layer["via1"]    = (12, 0)
 layer["metal2"]  = (13, 0)
@@ -89,10 +90,6 @@ drclvs_home=os.environ.get("DRCLVS_HOME")
 
 drc = design_rules("freepdk45")
 
-drc["body_tie_down"] = 0
-drc["has_pwell"] = True
-drc["has_nwell"] = True
-
 #grid size
 drc["grid"] = 0.0025
 

technology/scn4m_subm/tech/tech.py

@@ -37,13 +37,14 @@ GDS["zoom"] = 0.5
 layer={} 
 layer["vtg"]            = (-1, 0)
 layer["vth"]            = (-1, 0)
-layer["contact"]        = (47, 0)
 layer["pwell"]          = (41, 0)
 layer["nwell"]          = (42, 0)
 layer["active"]         = (43, 0)
 layer["pimplant"]       = (44, 0)
 layer["nimplant"]       = (45, 0)
 layer["poly"]           = (46, 0)
+layer["poly_contact"]   = None
+layer["contact"]        = (47, 0)
 layer["active_contact"] = (48, 0)
 layer["metal1"]         = (49, 0) 
 layer["via1"]           = (50, 0)
@@ -78,10 +79,6 @@ drclvs_home=os.environ.get("DRCLVS_HOME")
 
 drc = design_rules("scn4me_sub")
 
-drc["body_tie_down"] = 0
-drc["has_pwell"] = True
-drc["has_nwell"] = True
-
 #grid size is 1/2 a lambda
 drc["grid"]=0.5*_lambda_