Moving wide metal spacing to routing grid level

compiler/drc/design_rules.py

@@ -16,7 +16,7 @@ class design_rules():
     def __call__(self, name, *args):
         rule = self.rules[name]
         if callable(rule):
-            return rule(args)
+            return rule(*args)
         else:
             return rule
 

compiler/drc/drc_lut.py

@@ -1,3 +1,4 @@
+import debug
 
 class drc_lut():
     """ 
@@ -6,8 +7,8 @@ class drc_lut():
     It searches through backwards until all of the key values are
     met and returns the rule value.
     For exampe, the key values can be width and length,
-    and it would return the rule for a wire of a given width and length.
+    and it would return the rule for a wire of at least a given width and length.
-    A key can be not compared by passing a None.
+    A dimension can be ignored by passing inf.
     """
     def __init__(self, table):
         self.table = table
@@ -16,20 +17,24 @@ class drc_lut():
         """
         Lookup a given tuple in the table.
         """
-        if len(*key)==0:
+        if len(key)==0:
-            key_size = len(list(self.table.keys())[0])
+            first_key = list(sorted(self.table.keys()))[0]
-            key = tuple(0 for i in range(key_size))
+            return self.table[first_key]
+
         for table_key in sorted(self.table.keys(), reverse=True):
             if self.match(key, table_key):
                 return self.table[table_key]
                 
-    def match(self, t1, t2):
+
+    def match(self, key1, key2):
         """
-        Determine if t1>t2 for each tuple pair.
+        Determine if key1>=key2 for all tuple pairs.
+        (i.e. return false if key1<key2 for any pair.)
         """
         # If any one pair is less than, return False
-        for i in range(len(t1)):
+        debug.check(len(key1)==len(key2),"Comparing invalid key lengths.")
-            if t1[i] < t2[i]:
+        for k1,k2 in zip(key1,key2):
+            if k1 < k2:
                 return False
         return True
                 

compiler/router/router.py

@@ -483,10 +483,10 @@ class router:
         else:
             debug.error("Invalid zindex for track", -1)
 
-        width = drc("minwidth_{0}".format(layer_name), width, length)
+        min_width = drc("minwidth_{0}".format(layer_name), width, length)
-        spacing = drc(str(layer_name)+"_to_"+str(layer_name), width, length)
+        min_spacing = drc(str(layer_name)+"_to_"+str(layer_name), width, length)
 
-        return (width,spacing)
+        return (min_width,min_spacing)
 
     def convert_pin_coord_to_tracks(self, pin, coord):
         """ 
@@ -1112,8 +1112,8 @@ class router:
         ll = path[0][0]
         ur = path[-1][-1]
         z = ll.z
-        
         pin = self.add_enclosure(ll, ur, z, name)
+        print(ll, ur, ll.z, "->",pin)
         self.cell.add_layout_pin(text=name,
                                  layer=pin.layer,
                                  offset=pin.ll(),
@@ -1133,20 +1133,11 @@ class router:
         (abs_ll,unused) = self.convert_track_to_shape(ll)
         (unused,abs_ur) = self.convert_track_to_shape(ur)
 
-        # Get the layer information
-        x_distance = abs(abs_ll.x-abs_ur.x)
-        y_distance = abs(abs_ll.y-abs_ur.y)
-        shape_width = min(x_distance, y_distance)
-        shape_length = max(x_distance, y_distance)
-
         # Get the DRC rule for the grid dimensions
-        (width, space) = self.get_layer_width_space(zindex, shape_width, shape_length)
+        (width, space) = self.get_layer_width_space(zindex)
         layer = self.get_layer(zindex)
 
-        # Compute the shape offsets with correct spacing
+        pin = pin_layout(name, [abs_ll, abs_ur], layer)
-        new_ll = abs_ll + vector(0.5*space, 0.5*space)
-        new_ur = abs_ur - vector(0.5*space, 0.5*space)        
-        pin = pin_layout(name, [new_ll, new_ur], layer)
         
         return pin
             

compiler/router/supply_router.py

@@ -69,7 +69,7 @@ class supply_router(router):
         # Determine the rail locations
         self.route_supply_rails(self.vdd_name,1)
         
-        #self.write_debug_gds("pre_pin_debug.gds",stop_program=True)
+        self.write_debug_gds("pre_pin_debug.gds",stop_program=True)
         
         # Route the supply pins to the supply rails
         self.route_pins_to_rails(gnd_name)
@@ -132,16 +132,27 @@ class supply_router(router):
                 self.add_wavepath(name, wave_path)
 
 
+    def compute_supply_rails(self, name, start_offset):
+        """
+        Compute the unblocked locations for the horizontal and vertical supply rails.
+        Go in a raster order from bottom to the top (for horizontal) and left to right
+        (for vertical). Start with an initial start_offset in x and y direction.
+        """
 
-    def route_supply_rails(self, name, supply_number):
-        """
-        Route the horizontal and vertical supply rails across the entire design.
-        Must be done with lower left at 0,0
-        """
-        start_offset = supply_number*self.rail_track_width
         max_yoffset = self.rg.ur.y
         max_xoffset = self.rg.ur.x
-        step_offset = 2*self.rail_track_width
+        max_length = max(max_yoffset,max_xoffset)
+
+        # Convert the number of tracks to dimensions to get the design rule spacing
+        rail_width = self.track_width*self.rail_track_width
+        (horizontal_width, horizontal_space) = self.get_layer_width_space(0, rail_width, max_length)
+        (vertical_width, vertical_space) = self.get_layer_width_space(1, rail_width, max_length)
+        width = max(horizontal_width, vertical_width)
+        space = max(horizontal_space, vertical_space)
+
+        # This is the supply rail pitch in terms of routing grids
+        # The 2* is to alternate the two supplies
+        step_offset = 2*math.ceil((width+space)/self.track_width)
 
         # Horizontal supply rails
         for offset in range(start_offset, max_yoffset, step_offset):
@@ -161,6 +172,16 @@ class supply_router(router):
             while wave and wave[0].y < max_yoffset:
                 wave = self.find_supply_rail(name, wave, direction.NORTH)
 
+    def route_supply_rails(self, name, supply_number):
+        """
+        Route the horizontal and vertical supply rails across the entire design.
+        Must be done with lower left at 0,0
+        """
+
+        # Compute the grid locations of the supply rails
+        start_offset = supply_number*self.rail_track_width
+        self.compute_supply_rails(name, start_offset)
+        
         # Add the supply rail vias (and prune disconnected rails)
         self.connect_supply_rails(name)