'stable operator

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Can I use 'stable operator in VHDL to monitor the change of signal level without using it as clock signal.

Signal a : std_logic;

begin

process ()

If rising_edge (clk) then

if (not a'stable) then

Dout <= Din;

end if;

end if;

But this gives me error in xilinx ISE and I had to use the stable operator as clock signal like,

if (not a'stable and a='1')

any guidelines of how to use 'stable operator
 

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