You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
962 B
45 lines
962 B
library ieee ;
|
|
use ieee.std_logic_1164.all;
|
|
use ieee.numeric_std.all;
|
|
|
|
use std.env.all;
|
|
|
|
|
|
entity tb_blink is
|
|
end entity tb_blink;
|
|
|
|
|
|
architecture sim of tb_blink is
|
|
|
|
signal s_clk : std_logic := '1';
|
|
signal s_rst_n : std_logic := '0';
|
|
signal s_led_n : std_logic_vector(7 downto 0);
|
|
|
|
begin
|
|
|
|
dut : entity work.blink
|
|
port map (
|
|
clk_i => s_clk,
|
|
rst_n_i => s_rst_n,
|
|
led_n_o => s_led_n
|
|
);
|
|
|
|
s_rst_n <= '1' after 1.2 us;
|
|
s_clk <= not s_clk after 500 ns;
|
|
|
|
-- Let's test the first 8 values of LED output
|
|
process is
|
|
begin
|
|
wait until s_rst_n;
|
|
wait until rising_edge(s_clk);
|
|
for i in 0 to 7 loop
|
|
report "LED: " & to_hstring(not s_led_n);
|
|
assert to_integer(unsigned(not s_led_n)) = i
|
|
report "LED error, got 0x" & to_hstring(s_led_n) & ", expected 0x" & to_hstring(to_unsigned(255-i, 8))
|
|
severity failure;
|
|
wait until s_led_n'event;
|
|
end loop;
|
|
stop(0);
|
|
end process;
|
|
|
|
end architecture;
|