From 3bbb60450412c59d5cb8bdb95fc093847749615c Mon Sep 17 00:00:00 2001
From: Matt Guthaus <mrg@ucsc.edu>
Date: Mon, 16 Jul 2018 10:19:52 -0700
Subject: [PATCH] Add new power supplies to delay chain

---
 compiler/base/hierarchy_layout.py | 13 +++++++++++++
 compiler/modules/delay_chain.py   | 24 +++++++++++-------------
 2 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/compiler/base/hierarchy_layout.py b/compiler/base/hierarchy_layout.py
index 60519bdf..a398efe6 100644
--- a/compiler/base/hierarchy_layout.py
+++ b/compiler/base/hierarchy_layout.py
@@ -601,6 +601,19 @@ class layout(lef.lef):
                       width=xmax-xmin,
                       height=ymax-ymin)
 
+    def add_power_pin(self, name, loc):
+        """ 
+        Add a single power pin from M3 own to M1
+        """
+        self.add_via_center(layers=("metal1", "via1", "metal2"),
+                            offset=loc,
+                            rotate=90)
+        self.add_via_center(layers=("metal2", "via2", "metal3"),
+                            offset=loc)
+        self.add_layout_pin_rect_center(text=name,
+                                        layer="metal3",
+                                        offset=loc)
+        
     def add_power_ring(self, bbox):
         """
         Create vdd and gnd power rings around an area of the bounding box argument. Must
diff --git a/compiler/modules/delay_chain.py b/compiler/modules/delay_chain.py
index 4b3dc150..04275eb7 100644
--- a/compiler/modules/delay_chain.py
+++ b/compiler/modules/delay_chain.py
@@ -164,19 +164,17 @@ class delay_chain(design.design):
         """ Add vdd and gnd rails and the input/output. Connect the gnd rails internally on
         the top end with no input/output to obstruct. """
 
-        for driver in self.driver_inst_list:
-            vdd_pin = driver.get_pin("vdd")
-            self.add_layout_pin(text="vdd",
-                                layer="metal1",
-                                offset=vdd_pin.ll(),
-                                width=self.width,
-                                height=vdd_pin.height())
-            gnd_pin = driver.get_pin("gnd")
-            self.add_layout_pin(text="gnd",
-                                layer="metal1",
-                                offset=gnd_pin.ll(),
-                                width=self.width,
-                                height=gnd_pin.height())
+        for pin_name in ["vdd", "gnd"]:
+            for driver in self.driver_inst_list:
+                pin = driver.get_pin(pin_name)
+                start = pin.lc()
+                end = start + vector(self.width,0)
+                self.add_power_pin(pin_name, start)
+                self.add_power_pin(pin_name, end)
+                self.add_rect(layer="metal1",
+                              offset=pin.ll(),
+                              width=self.width,
+                              height=pin.height())
 
         # input is A pin of first inverter
         a_pin = self.driver_inst_list[0].get_pin("A")