set dont touch attribute in xilinx xst?

[Serkan]

Is there a "set_dont_touch" equaivalent version of Xilinx Xst
attribute. Or is it only in synopsys?

 

[JimLewis]

   Is there a "set_dont_touch" equaivalent version of Xilinx Xst
attribute. Or is it only in synopsys?

If you are trying to preserve a wire, the attribute is keep.
So if you are trying to set a don't

signal T1, T2 : std_logic ;

Attribute keep : boolean ;
Attribute keep of T1, T2 : signal is true ;


Cheers,
Jim
SynthWorks VHDL Training

 

[Serkan]

thank you for your answer.

best regards

If you are trying to preserve a wire, the attribute is keep.
So if you are trying to set a don't

signal T1, T2 : std_logic ;

Attribute keep : boolean ;
Attribute keep of T1, T2 : signal is true ;


Cheers,
Jim
SynthWorks VHDL Training