1 files changed, 40 insertions, 0 deletions
diff --git a/testsuite/synth/dff01/tb_dff04.vhdl b/testsuite/synth/dff01/tb_dff04.vhdl
new file mode 100644
index 000000000..1d3b3146f
--- /dev/null
+++ b/testsuite/synth/dff01/tb_dff04.vhdl
@@ -0,0 +1,40 @@
+entity tb_dff04 is
+end tb_dff04;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+architecture behav of tb_dff04 is
+  signal clk : std_logic;
+  signal din : std_logic_vector (7 downto 0);
+  signal dout : std_logic_vector (7 downto 0);
+begin
+  dut: entity work.dff04
+    port map (
+      r => dout,
+      d => din,
+      clk => clk);
+
+  process
+    procedure pulse is
+    begin
+      clk <= '0';
+      wait for 1 ns;
+      clk <= '1';
+      wait for 1 ns;
+    end pulse;
+  begin
+    din <= x"00";
+    pulse;
+    assert dout = x"01" severity failure;
+    din <= x"ab";
+    pulse;
+    assert dout = x"ac" severity failure;
+    pulse;
+    assert dout = x"ac" severity failure;
+    din <= x"12";
+    pulse;
+    assert dout = x"13" severity failure;
+    wait;
+  end process;
+end behav;