diff --git a/compiler/modules/custom_module_properties.py b/compiler/modules/custom_module_properties.py
new file mode 100644
index 00000000..43c140b0
--- /dev/null
+++ b/compiler/modules/custom_module_properties.py
@@ -0,0 +1,27 @@
+# See LICENSE for licensing information.
+#
+# Copyright (c) 2016-2020 Regents of the University of California and The Board
+# of Regents for the Oklahoma Agricultural and Mechanical College
+# (acting for and on behalf of Oklahoma State University)
+# All rights reserved.
+#
+
+class _dff:
+    def __init__(self, use_custom_ports, custom_port_list, custom_type_list):
+        self.use_custom_ports = use_custom_ports
+        self.custom_port_list = custom_port_list
+        self.custom_type_list = custom_type_list
+
+class module_properties():
+    """
+    TODO
+    """
+    def __init__(self):
+        self.names = {}
+        self._dff = _dff(use_custom_ports = False,
+                         custom_port_list = [],
+                         custom_type_list = [])
+
+    @property
+    def dff(self):
+        return self._dff
diff --git a/compiler/modules/dff.py b/compiler/modules/dff.py
index 8871872d..1078088e 100644
--- a/compiler/modules/dff.py
+++ b/compiler/modules/dff.py
@@ -7,6 +7,7 @@
 #
 import design
 from tech import GDS, layer, spice, parameter
+from tech import module_properties
 import utils
 
 
@@ -14,9 +15,13 @@ class dff(design.design):
     """
     Memory address flip-flop
     """
+    if not module_properties.dff.use_custom_ports:
+        pin_names = ["D", "Q", "clk", "vdd", "gnd"]
+        type_list = ["INPUT", "OUTPUT", "INPUT", "POWER", "GROUND"]
+    else:
+        pin_names = module_properties.dff.custom_port_list
+        type_list = module_properties.dff.custom_type_list
 
-    pin_names = ["D", "Q", "clk", "vdd", "gnd"]
-    type_list = ["INPUT", "OUTPUT", "INPUT", "POWER", "GROUND"]
     (width, height) = utils.get_libcell_size("dff",
                                              GDS["unit"],
                                              layer["boundary"])