1 files changed, 68 insertions, 0 deletions
diff --git a/testsuite/synth/issue662/tb_psl_stable.vhdl b/testsuite/synth/issue662/tb_psl_stable.vhdl
new file mode 100644
index 000000000..b038caf36
--- /dev/null
+++ b/testsuite/synth/issue662/tb_psl_stable.vhdl
@@ -0,0 +1,68 @@
+library ieee;
+  use ieee.std_logic_1164.all;
+
+entity tb_psl_stable is
+end entity tb_psl_stable;
+
+
+architecture psl of tb_psl_stable is
+
+  procedure seq (s : string; signal clk : std_logic; signal o : out std_logic)
+  is
+  begin
+    for i in s'range loop
+      wait until rising_edge(clk);
+      case s(i) is
+        when '0' | '_' => o <= '0';
+        when '1' | '-' => o <= '1';
+        when others    => o <= 'X';
+      end case;
+    end loop;
+    wait;
+  end seq;
+
+  procedure hseq (s : string; signal clk : std_logic; signal o : out std_logic_vector(3 downto 0))
+  is
+  begin
+    for i in s'range loop
+      wait until rising_edge(clk);
+      case s(i) is
+        when '0' | '_' => o <= x"0";
+        when '1'       => o <= x"1";
+        when '2'       => o <= x"2";
+        when '3'       => o <= x"3";
+        when '4'       => o <= x"4";
+        when '5'       => o <= x"5";
+        when '6'       => o <= x"6";
+        when '7'       => o <= x"7";
+        when '8'       => o <= x"8";
+        when '9'       => o <= x"9";
+        when 'a' | 'A' => o <= x"A";
+        when 'b' | 'B' => o <= x"B";
+        when 'c' | 'C' => o <= x"C";
+        when 'd' | 'D' => o <= x"D";
+        when 'e' | 'E' => o <= x"E";
+        when 'f' | 'F' | '-' => o <= x"F";
+        when others => o <= x"X";
+      end case;
+    end loop;
+    wait;
+  end hseq;
+
+  signal a, b, c : std_logic := '0';
+  signal d       : std_logic_vector(3 downto 0) := x"0";
+  signal clk     : std_logic := '1';
+
+begin
+
+  dut: entity work.psl_stable port map (clk, a, b, c, d);
+
+  clk <= not clk after 500 ps;
+
+  --             012345678901234
+  SEQ_A :  seq ("_--__---____--_", clk, a);
+  SEQ_B :  seq ("__-____-_____-_", clk, b);
+  SEQ_C :  seq ("_--__________-_", clk, c);
+  SEQ_D : hseq ("011006660000000", clk, d);
+
+end architecture psl;