Add custom cell properties to technologies

this is technology specific database to store data about the custom
design cells. For now it only contains on which axis the bitcells are
mirrored. This is a first step to support thin cells that need to be
mirrored on the x and y axis.

Signed-off-by: Bastian Koppelmann <[email protected]>

compiler/modules/base_array.py

@@ -7,6 +7,7 @@
 #
 import debug
 import design
+from tech import cell_properties
 
 class bitcell_base_array(design.design):
     """
@@ -93,8 +94,7 @@ class bitcell_base_array(design.design):
             yoffset = 0.0
             for row in range(self.row_size):
                 name = name_template.format(row, col)
-
-                if (row + row_offset) % 2:
+                if cell_properties.bitcell.mirror.x and (row + row_offset) % 2:
                     tempy = yoffset + self.cell.height
                     dir_key = "MX"
                 else:

compiler/modules/custom_cell_properties.py

@@ -0,0 +1,28 @@
+# 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 _MirrorAxis:
+    def __init__(self, x, y):
+        self.x = x
+        self.y = y
+
+class _Bitcell:
+    def __init__(self, mirror):
+        self.mirror = mirror
+
+class CellProperties():
+    """
+    TODO
+    """
+    def __init__(self):
+        self.names = {}
+        self._bitcell = _Bitcell(_MirrorAxis(True, False))
+
+    @property
+    def bitcell(self):
+        return self._bitcell

compiler/modules/replica_column.py

@@ -92,7 +92,7 @@ class replica_column(design.design):
             self.connect_inst(self.get_bitcell_pins(0, row))
             
     def place_instances(self):
-
+        from tech import cell_properties
         # Flip the mirrors if we have an odd number of replica+dummy rows at the bottom
         # so that we will start with mirroring rather than not mirroring
         rbl_offset = (self.left_rbl+1)%2
@@ -100,7 +100,7 @@ class replica_column(design.design):
         for row in range(self.total_size):
             name = "bit_r{0}_{1}".format(row,"rbl")
             offset = vector(0,self.cell.height*(row+(row+rbl_offset)%2))
-            if (row+rbl_offset)%2:
+            if cell_properties.bitcell.mirror.x and (row+rbl_offset)%2:
                 dir_key = "MX"
             else:
                 dir_key = "R0"