First draft of sram_factory code

compiler/modules/dff_buf.py

@@ -4,7 +4,7 @@ from tech import drc,parameter
 from math import log
 from vector import vector
 from globals import OPTS
-from pinv import pinv
+from sram_factory import factory
 
 class dff_buf(design.design):
     """
@@ -50,16 +50,17 @@ class dff_buf(design.design):
         self.DRC_LVS()
 
     def add_modules(self):
-        from importlib import reload
-        c = reload(__import__(OPTS.dff))
-        self.mod_dff = getattr(c, OPTS.dff)
-        self.dff = self.mod_dff("dff")
+        self.dff = factory.create(module_type="dff")
         self.add_mod(self.dff)
 
-        self.inv1 = pinv(size=self.inv1_size,height=self.dff.height)
+        self.inv1 = factory.create(module_type="pinv",
+                                   size=self.inv1_size,
+                                   height=self.dff.height)
         self.add_mod(self.inv1)
 
-        self.inv2 = pinv(size=self.inv2_size,height=self.dff.height)
+        self.inv2 = factory.create(module_type="pinv",
+                                   size=self.inv2_size,
+                                   height=self.dff.height)
         self.add_mod(self.inv2)
 
         
@@ -182,4 +183,4 @@ class dff_buf(design.design):
         #This is a handmade cell so the value must be entered in the tech.py file or estimated.
         #Calculated in the tech file by summing the widths of all the gates and dividing by the minimum width.
         #FIXME: Dff changed in a past commit. The parameter need to be updated.
-        return parameter["dff_clk_cin"]
+        return parameter["dff_clk_cin"]