diff --git a/dataflow_neuro/cell_lib_async.act b/dataflow_neuro/cell_lib_async.act
index 1e424af..e6b8e6a 100644
--- a/dataflow_neuro/cell_lib_async.act
+++ b/dataflow_neuro/cell_lib_async.act
@@ -478,6 +478,24 @@ namespace tmpl {
                 p_n_mode <- 1;
             y {-1}}
         }
+        export defcell arbiter_handshake(bool in1_r, in1_a,in2_r, in2_a out_r, out_a)
+        {
+          bool _u, _v;
+          A_2C_B_X1 cel1(.c1 = out_a,.c2 = v,.y = in1_a);
+          A_2C_B_X1 cel2(.c1 = out_a,.c2 = u,.y = in2_a);
+          prs {
+           [keeper=0]  in1_v &  _v -> _u-
+           [keeper=0] ~in1_v  | ~_v  -> _u+
+           [keeper=0]  in2_v &  _u -> _v-
+           [keeper=0] ~in2_v  | ~_u  -> _v+
+           [keeper=0] ~_u | ~in2_a  => u+
+           [keeper=0] ~_v | ~in1_a  => v+
+           [keeper=0] u | v  => out_r 
+          }
+          spec {
+            mk_excllo(_u, _v)
+          }
+        }
         }}
 
 
diff --git a/test/unit_tests/arbiter_2/test.act b/test/unit_tests/arbiter_2/test.act
new file mode 100644
index 0000000..1d0f676
--- /dev/null
+++ b/test/unit_tests/arbiter_2/test.act
@@ -0,0 +1,33 @@
+defproc arbiter (bool a, b, u, v)
+{
+  bool _u, _v;
+  prs {
+   [keeper=0]  a &  _v -> _u-
+   [keeper=0] ~a  | ~_v  -> _u+
+   [keeper=0]  b &  _u -> _v-
+   [keeper=0] ~b  | ~_u  -> _v+
+   [keeper=0] _u  => u-
+   [keeper=0] _v => v-
+  }
+  spec {
+    mk_excllo(_u, _v)
+  }
+}
+
+bool Reset;
+
+defproc driver(bool r, a)
+{
+   prs {
+     Reset | a => r-
+   }
+}
+
+
+defproc test()
+{
+   driver d1, d2;
+   arbiter a(d1.r, d2.r, d1.a, d2.a);
+}
+
+test t;
diff --git a/test/unit_tests/arbiter_2/test.prsim b/test/unit_tests/arbiter_2/test.prsim
new file mode 100644
index 0000000..7192820
--- /dev/null
+++ b/test/unit_tests/arbiter_2/test.prsim
@@ -0,0 +1,8 @@
+watchall
+cycle
+set Reset 0
+cycle
+
+status X
+mode run
+system "echo 'finished'"
\ No newline at end of file