Cleanup the new router

compiler/router/router_tech.py

@@ -138,7 +138,7 @@ class router_tech:
         min_width = self.route_track_width * drc("minwidth_{0}".format(layer_name), self.route_track_width * min_wire_width, math.inf)
         return min_width
 
-    def get_layer_space(self, zindex, width):
+    def get_layer_space(self, zindex, width=None):
         """ Return the minimum spacing of a layer given wire width. """
         if width is None:
             width = self.get_layer_width(zindex)

compiler/router/signal_escape_router.py

@@ -18,7 +18,7 @@ class signal_escape_router(router):
 
     def __init__(self, layers, design, bbox=None):
 
-        # `router_tech` contains tech constants for the router
+        # `router` is the base router class
         router.__init__(self, layers, design, bbox)
 
         # New pins are the side supply pins
@@ -146,7 +146,7 @@ class signal_escape_router(router):
 
 
     def get_route_pairs(self, pin_names):
-        """  """
+        """ Return the pairs to be routed. """
 
         to_route = []
         for name in pin_names:
@@ -157,7 +157,7 @@ class signal_escape_router(router):
 
 
     def replace_layout_pins(self):
-        """  """
+        """ Replace the old layout pins with new ones around the perimeter. """
 
         for name, pin in self.new_pins.items():
             pin = graph_shape(pin.name, pin.boundary, pin.lpp)

compiler/router/supply_router.py

@@ -18,7 +18,7 @@ class supply_router(router):
 
     def __init__(self, layers, design, bbox=None, pin_type=None):
 
-        # `router_tech` contains tech constants for the router
+        # `router` is the base router class
         router.__init__(self, layers, design, bbox)
 
         # Side supply pin type