testsuite/synth: add a test for #2231

3 files changed, 90 insertions, 0 deletions

diff --git a/testsuite/synth/issue2231/areset.vhdl b/testsuite/synth/issue2231/areset.vhdl
new file mode 100644
index 000000000..fb20e2a31
--- /dev/null
+++ b/testsuite/synth/issue2231/areset.vhdl
@@ -0,0 +1,28 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity areset is
+	port (
+		clk_sys : in std_logic;
+		reset_n : in std_logic;
+		d : in std_logic;
+		q : out std_logic_vector(1 downto 0)
+	);
+end entity;
+
+architecture rtl of areset is
+	signal q_i : std_logic_vector(1 downto 0);
+begin
+
+	process(clk_sys,reset_n) begin
+		if reset_n='0' then
+			q_i(0)<='0';
+		elsif rising_edge(clk_sys) then
+			q_i(1)<=d;
+			q_i(0)<='1';
+		end if;
+	end process;
+
+	q<=q_i;
+
+end architecture;
diff --git a/testsuite/synth/issue2231/tb_areset.vhdl b/testsuite/synth/issue2231/tb_areset.vhdl
new file mode 100644
index 000000000..55b56c680
--- /dev/null
+++ b/testsuite/synth/issue2231/tb_areset.vhdl
@@ -0,0 +1,55 @@
+entity tb_areset is
+end tb_areset;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+architecture behav of tb_areset is
+  signal clk : std_logic;
+  signal rst_n : std_logic;
+  signal din : std_logic;
+  signal dout : std_logic_vector(1 downto 0);
+begin
+  dut: entity work.areset
+    port map (
+      clk_sys => clk,
+      reset_n => rst_n,
+      d => din,
+      q => dout);
+
+  process
+    procedure pulse is
+    begin
+      clk <= '0';
+      wait for 1 ns;
+      clk <= '1';
+      wait for 1 ns;
+    end pulse;
+  begin
+    din <= '0';
+    rst_n <= '0';
+    pulse;
+    assert dout (0) = '0' severity failure;
+
+    din <= '1';
+    pulse;
+    assert dout (0) = '0' severity failure;
+
+    rst_n <= '1';
+    pulse;
+    assert dout (0) = '1' severity failure;
+    assert dout (1) = '1' severity failure;
+
+    din <= '0';
+    pulse;
+    assert dout (0) = '1' severity failure;
+    assert dout (1) = '0' severity failure;
+
+    din <= '1';
+    rst_n <= '0';
+    pulse;
+    assert dout (0) = '0' severity failure;
+    assert dout (1) = '0' severity failure;
+wait;
+  end process;
+end behav;
diff --git a/testsuite/synth/issue2231/testsuite.sh b/testsuite/synth/issue2231/testsuite.sh
new file mode 100755
index 000000000..b98df94ee
--- /dev/null
+++ b/testsuite/synth/issue2231/testsuite.sh
@@ -0,0 +1,7 @@
+#! /bin/sh
+
+. ../../testenv.sh
+
+synth_tb areset
+
+echo "Test successful"