diff --git a/dataflow_neuro/cell_lib_async.act b/dataflow_neuro/cell_lib_async.act
index 4fcf831..274927a 100644
--- a/dataflow_neuro/cell_lib_async.act
+++ b/dataflow_neuro/cell_lib_async.act
@@ -588,6 +588,24 @@ namespace tmpl {
         }
         }
 
+        export
+        defproc A_2P_U_X4(bool? a, b; bool! y; bool? vdd, vss)
+        {
+        prs{
+        [keeper=0] ~a & ~b -> y+
+        }
+        }
+
+        export
+        defproc PULLDOWN_X4(bool? a; bool! y; bool? vdd, vss) {
+            A_1N_U_X4 cell(.a = a, .y = y, .vdd = vdd, .vss = vss);
+        }
+
+        export
+        defproc PULLUP_X4(bool? a; bool! y; bool? vdd, vss) {
+            A_1P_U_X4 cell(.a = a, .y = y, .vdd = vdd, .vss = vss);
+        }
+
         defproc A_2C2P_RB_X1(bool! y;bool? c1,c2,p1,p2,reset_B,vdd,vss){
             bool _y;
             prs{