Merge pull request #656 from The-OpenROAD-Project-staging/gf180-via-res

Update via resistance per corner for g180

Author: maliberty

flow/platforms/gf180/setRC.tcl

@@ -11,7 +11,34 @@ if { $metal == "6" } {
   set_wire_rc -clock  -layer Metal5
 
 } elseif  { $metal == "5" } {
-
+  # TC matches LEF.  These are the temperature adjusted values.
+  # The other stacks are likely similar but I haven't checked yet.
+  if {$::env(CORNER) == "WC"} {
+    set_layer_rc -via Via1 -resistance 16.845
+    set_layer_rc -via Via2 -resistance 16.845
+    set_layer_rc -via Via3 -resistance 16.845
+    set_layer_rc -via Via4 -resistance 16.845
+
+    set tech [ord::get_db_tech]
+    foreach via [$tech getVias] {
+      if {[$via getResistance] == 4.5} {
+        $via setResistance 16.845
+      }
+    }
+  } elseif {$::env(CORNER) == "BC"} {
+    set_layer_rc -via Via1 -resistance 4.23
+    set_layer_rc -via Via2 -resistance 4.23
+    set_layer_rc -via Via3 -resistance 4.23
+    set_layer_rc -via Via4 -resistance 4.23
+
+    set tech [ord::get_db_tech]
+    foreach via [$tech getVias] {
+      if {[$via getResistance] == 4.5} {
+        $via setResistance 4.23
+      }
+    }
+  }
+  
   set_wire_rc -signal -layer Metal2
   set_wire_rc -clock  -layer Metal4