And now the solution, thank you for all hints.
Hello World
1111
And now the correct code:
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
--USE ieee.std_logic_unsigned.all;
USE ieee.numeric_std.ALL;
use STD.textio.all; -- basic I/O
ENTITY t_tb IS
END t_tb;
ARCHITECTURE behavior OF t_tb IS
signal data : signed (15 downto 0);
BEGIN
process
variable my_line : line; -- type 'line' comes from textio
begin
data<=to_signed(1111,16);
wait for 5 ns;
write(my_line, string'("Hello World")); -- formatting
writeline(output, my_line); -- write to
"output"
write(my_line,to_integer(data));
writeline(output, my_line);
wait;
end process;
END;
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