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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity hello is
port (clk, rst: std_logic;
cnt : out unsigned(3 downto 0));
end hello;
architecture behav of hello 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;
--psl default clock is rising_edge(clk);
--psl restrict {rst; (not rst)[*]};
--psl assert always val /= 5 abort rst;
--psl assume always val < 10;
--psl cover {val = 10};
end behav;
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