1 files changed, 46 insertions, 0 deletions
diff --git a/testsuite/synth/issue1090/tb_simple_ram.vhdl b/testsuite/synth/issue1090/tb_simple_ram.vhdl
new file mode 100644
index 000000000..437c6543a
--- /dev/null
+++ b/testsuite/synth/issue1090/tb_simple_ram.vhdl
@@ -0,0 +1,46 @@
+entity tb_simple_ram is
+end tb_simple_ram;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+architecture behav of tb_simple_ram is
+  signal raddr : std_logic_vector(5 downto 0);
+  signal rdat : std_logic_vector(31 downto 0);
+  signal en : std_logic;
+  signal waddr : std_logic_vector(5 downto 0);
+  signal wdat : std_logic_vector(31 downto 0);
+  signal we : std_logic_vector (3 downto 0);
+  signal clk : std_logic;
+begin
+  dut: entity work.simple_ram
+    port map (clk => clk,
+              en => en, raddr => raddr, do => rdat,
+              we => we, waddr => waddr, di => wdat);
+
+  process
+    procedure pulse is
+    begin
+      clk <= '0';
+      wait for 1 ns;
+      clk <= '1';
+      wait for 1 ns;
+    end pulse;
+  begin
+    en <= '1';
+    raddr <= "000000";
+    we <= "0000";
+    waddr <= "000001";
+    wdat <= x"00_00_00_01";
+    pulse;
+    assert rdat = x"0000_0110" severity failure;
+
+    raddr <= "000001";
+    waddr <= "000010";
+    wdat <= x"00_00_00_02";
+    pulse;
+    assert rdat = x"0000_1ffc" severity failure;
+
+    wait;
+  end process;
+end behav;