testsuite/synth: Add a test case. For #1675

1 files changed, 41 insertions, 0 deletions

diff --git a/testsuite/synth/issue1675/tb_accumwr.vhdl b/testsuite/synth/issue1675/tb_accumwr.vhdl
new file mode 100644
index 000000000..ead0fe966
--- /dev/null
+++ b/testsuite/synth/issue1675/tb_accumwr.vhdl
@@ -0,0 +1,41 @@
+entity tb_accumwr is
+end tb_accumwr;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+use work.pkg.all;
+
+architecture behav of tb_accumwr is
+  signal clk : std_logic;
+  signal rst : std_logic;
+  signal en : std_logic;
+  signal res : std_logic_vector(15 downto 0);
+begin
+  dut: entity work.accumwr
+    port map (clk, rst, en, res);
+
+  process
+    procedure pulse is
+    begin
+      clk <= '0';
+      wait for 1 ns;
+      clk <= '1';
+      wait for 1 ns;
+    end pulse;
+  begin
+    rst <= '1';
+    en <= '0';
+    pulse;
+    assert res = x"0000" severity failure;
+
+    rst <= '0';
+    pulse;
+    assert res = x"0000" severity failure;
+
+    en <= '1';
+    pulse;
+    assert res = x"0001" severity failure;
+    wait;
+  end process;
+end behav;