Infinite Loop
An infinite loop is a loop statement that does not include a for or while iteration keyword (or iteration scheme). An infinite loop will usually include an exit condition, as shown in the template below:
architecture inifinite_loop of my_entity is
begin
. . .
process(. . .)
. . .
loop_name: loop
. . .
exit when (condition);
end loop loop_name;
end process;
. . .
end infinite_loop;
An infinite loop using a wait statement is shown in the example below. This example exhibits exactly the same behavior as the while loop shown previously:
process
begin
loop
Clock <= not Clock;
wait for CLK_PERIOD/2;
if done = '1' or error_flag = '1' then
exit;
end if;
end loop;
end process;
As with a while loop, an infinite loop probably has no equivalent in hardware and is therefore not synthesizable.
See also
