Enhance bump API (#403)

src/hammer-vlsi/defaults.yml

@@ -316,14 +316,15 @@ vlsi.inputs:
     y: 0
     # pitch (float) - pitch of bumps in microns
     pitch: 0.0
-    # cell (str) - Name of bump cell
+    # cell (str) - Name of the default bump cell
     cell: ""
     # assignments - List of BumpAssignment structs. You must specify one of name or no_connect.
     # If both are specified the bump will be left unconnected
     #  - name (Optional[str]) - The name of the net being assigned to a bump
     #  - no_connect (Optional[bool]) - If True the bump will be present but unconnected
-    #  - x (int) - The X coordinate of the bump assigned to this net
-    #  - y (int) - The Y coordinate of the bump assigned to this net
+    #  - x (Decimal) - The X coordinate of the bump assigned to this net
+    #  - y (Decimal) - The Y coordinate of the bump assigned to this net
+    #  - custom_cell (Optional[str]) - Cell name (MACRO name) of a custom bump cell in place of the default for this bump. You must also specify the LEF and GDS for this bump in extra_libraries.
     assignments: []
 
   # Pin placement mode. (str)

src/hammer-vlsi/hammer_vlsi/constraints.py

@@ -14,6 +14,8 @@
 from hammer_utils import reverse_dict
 from .units import TimeValue, VoltageValue, TemperatureValue
 
+from decimal import Decimal
+
 __all__ = ['ILMStruct', 'SRAMParameters', 'Supply', 'PinAssignment',
            'BumpAssignment', 'BumpsDefinition', 'ClockPort',
            'OutputLoadConstraint', 'DelayConstraint', 'ObstructionType',
@@ -97,8 +99,9 @@ def from_setting(d: dict) -> "SRAMParameters":
 BumpAssignment = NamedTuple('BumpAssignment', [
     ('name', Optional[str]),
     ('no_connect', Optional[bool]),
-    ('x', int),
-    ('y', int)
+    ('x', Decimal),
+    ('y', Decimal),
+    ('custom_cell', Optional[str])
 ])
 
 BumpsDefinition = NamedTuple('BumpsDefinition', [

src/hammer-vlsi/hammer_vlsi/hammer_tool.py

@@ -905,12 +905,13 @@ def get_bumps(self) -> Optional[BumpsDefinition]:
             no_con = False if not "no_connect" in raw_assign else raw_assign["no_connect"]
             x = raw_assign["x"]
             y = raw_assign["y"]
+            cell = None if not "custom_cell" in raw_assign else raw_assign["custom_cell"]
             if name is None and not no_con:
                 self.logger.warning("Invalid bump assignment, neither name nor no_connect specified for bump {x},{y}. Assuming it should be unassigned".format(
                     x=x, y=y))
             else:
                 assignments.append(BumpAssignment(name=name, no_connect=no_con,
-                    x=x, y=y))
+                    x=x, y=y, custom_cell=cell))
         return BumpsDefinition(x=self.get_setting("vlsi.inputs.bumps.x"),
             y=self.get_setting("vlsi.inputs.bumps.y"),
             pitch=self.get_setting("vlsi.inputs.bumps.pitch"),