2 use ieee.std_logic_1164.all;
3 use ieee.std_logic_arith.all;
4 use ieee.std_logic_unsigned.all;
5 use ieee.numeric_std.all;
10 architecture behavioral of quadcount_tb is
16 qcount: out std_logic_vector (31 downto 0);
17 a_rise, a_fall, b_rise, b_fall, ab_event: out std_logic;
18 ab_error: out std_logic
22 signal clock, reset, a, b: std_logic;