reoriented cell and added tap cell

compiler/modules/rom_poly_tap.py

@@ -0,0 +1,54 @@
+
+
+from base import design
+from base import vector
+from sram_factory import factory
+
+class rom_poly_tap(design):
+
+    def __init__(self, name, strap_length=0, cell_name=None, prop=None, strap_layer="m2"):
+        super().__init__(name, cell_name, prop)
+        self.strap_layer=strap_layer
+        self.length = strap_length
+        self.create_netlist()
+        self.create_layout()
+
+    def create_netlist(self):
+
+
+        #for layout constants
+        self.dummy = factory.create(module_type="rom_dummy_cell")
+        pass
+
+    def create_layout(self):
+
+        self.place_via()
+        self.add_boundary()
+        if self.length < 0:
+            self.place_strap(self.length)
+    
+    def add_boundary(self):
+        self.height = self.dummy.height
+        self.width = self.poly_contact.width
+        super().add_boundary()
+
+    def place_via(self):
+
+        contact_width = self.poly_contact.width
+        
+        contact_x = contact_width * 0.5
+        contact_y = self.dummy.poly.offset.x + (self.poly_width * 0.5)
+
+        contact_offset = vector(contact_x, contact_y)
+        self.via = self.add_via_stack_center(from_layer="poly",
+                                  to_layer=self.strap_layer,
+                                  offset=contact_offset)
+
+    def place_strap(self, length):
+
+        strap_start = vector(self.via.cx(), self.via.cy())
+
+        strap_end = vector( self.dummy.width * length, self.via.cy())
+
+        self.strap = self.add_path(self.strap_layer, (strap_start, strap_end))
+