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library ieee;
use ieee.std_logic_1164.all;
entity test is
port(
tx : out std_logic);
end entity;
architecture tb of test is
begin
process
procedure transmit(data : std_logic_vector;
signal tx : out std_logic) is
variable norm : std_logic_vector(data'length - 1 downto 0) := data;
procedure send(value : std_logic) is
begin
tx <= value;
wait for 10 ns;
end procedure;
variable count : natural := 0;
begin
report natural'image (norm'left);
report natural'image (norm'right);
for i in norm'reverse_range loop
send(norm(i));
report to_string(i);
count := count + 1;
end loop;
assert count = 8 severity failure;
end procedure;
begin
transmit(x"55", tx);
wait;
end process;
end architecture;
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