How to convert decimal number into binary

[xilinx1001]

Hi,

How to convert integer value into decimal in VHDL.

I am trying to use conv_std _logic _vector

But I am getting some error like below:

Undefined symbol 'conv_std_logic_vector'.
 conv_std_logic_vector: Undefined symbol (last report in this block)

How can I solve the problem?.

Regards
xilinx1001

 

[HMS1021]

With just seeing the error it is hard to guess the error in the code.
Here is a snippet from working code as a syntax check:
tmp <= conv_std_logic_vector(conv_integer(A),9);
Be sure to include the required library.