synth: add a dff test.

1 files changed, 40 insertions, 0 deletions

diff --git a/testsuite/synth/dff01/tb_dff13.vhdl b/testsuite/synth/dff01/tb_dff13.vhdl
new file mode 100644
index 000000000..22adb53d1
--- /dev/null
+++ b/testsuite/synth/dff01/tb_dff13.vhdl
@@ -0,0 +1,40 @@
+entity tb_dff13 is
+end tb_dff13;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+architecture behav of tb_dff13 is
+  signal clk : std_logic;
+  signal din : std_logic;
+  signal dout : std_logic;
+begin
+  dut: entity work.dff13
+    port map (
+      q => 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 <= '0';
+    pulse;
+    assert dout = '0' severity failure;
+    din <= '1';
+    pulse;
+    assert dout = '1' severity failure;
+    pulse;
+    assert dout = '1' severity failure;
+    din <= '0';
+    pulse;
+    assert dout = '0' severity failure;
+    wait;
+  end process;
+end behav;