# HDL1003: Combinational loops should be removed ## Summary ```{raw} html

Reliability	Security	Maintainability	Code attribute	Effort to fix	Tags

HIGH	-	-	Intentionality \| Logical	1h	synthesis, bug-finder, do254, do254-ss3, cnes, cnes-std-05600, linty-ultra

``` ## Description ```{raw} html

process (clk)
begin
  if rising_edge(clk) then
    a <= not(a);
  end if;
end process;

process (b)
begin
  b <= not(b) -- Noncompliant
end process;

Combinational loops lead to unpredictable design. Thus, they must be removed.

``` ## Parameters No parameters. ```{raw} html ```