0ms+10000: limit of 10000 delta cycles reached
    |
  7 |         b : out std_logic_vector(1 downto 0)
    |         ^ driver for port B is active
 ...
 12 |     signal c : std_logic;
    |            ^ driver for signal C is active
 ...
 28 |         b : out std_logic_vector(1 downto 0) := "00"
    |         ^ driver for port B is active
    |
