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+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity assert1 is
+ port (clk, rst: std_logic;
+ cnt : out unsigned(3 downto 0));
+end assert1;
+
+architecture behav of assert1 is
+ signal val : unsigned (3 downto 0);
+begin
+ process(clk)
+ begin
+ if rising_edge(clk) then
+ if rst = '1' then
+ val <= (others => '0');
+ else
+ val <= val + 1;
+ end if;
+ end if;
+ end process;
+ cnt <= val;
+end behav;
+
+vunit verif1 (assert1)
+{
+ default clock is rising_edge(clk);
+ assert always cnt /= 5 abort rst;
+}