added pulldown2

dataflow_neuro/cell_lib_async.act

@@ -30,7 +30,9 @@ namespace tmpl {
             bool _y;
             prs{
                 y => _y-
-                [weak=1] _y => y-
+                [weak=1] _y -> y-
+                [weak=1] ~_y -> y+
+
                 }
             sizing {
                 leak_adjust <- 1; 
@@ -573,6 +575,13 @@ namespace tmpl {
         [keeper=0] a -> y-
         }
         }
+
+        defproc PULLDOWN2_X4(bool? a, b; bool! y; bool? vdd, vss)
+        {
+        prs{
+        [keeper=0] a & b -> y-
+        }
+        }
         
         defproc PULLUP_X4(bool? a; bool! y; bool? vdd, vss)
         {