[SOLVED] using "sra" in vhdl

[yamine]

hi,
i want to use "sra" for shifting right arithmetic, but i have this error:
"" Error (10476): VHDL error at cordic.vhd(76): type of identifier "y" does not agree with its usage as "bit_vector" type ""

 

[FvM]

The entity is where?

 

[yamine]

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
USE ieee.numeric_std.ALL;

entity coco is
    Port ( A: in  signed(15 downto 0);
           Z : out signed(15 downto 0) );
end coco;

architecture Behavioral of coco is
begin

Z<= A + (A sra 3);

end Behavioral;

 

[TrickyDicky]

Post more of the code. the code you posted is meaningless.

 

[yamine]

any help to resolve this problem ?

 

[FvM]

Review ieee.numeric_std. sra isn't defined for signed data type.

Z<= A + shift_right(A,3);

 

[yamine]

Thank you FvM,
that resolve my problem,
where can i fine the description of function defined in ieee.numeric_std ?

 

[TrickyDicky]

Try google:

https://www.csee.umbc.edu/portal/help/VHDL/numeric_std.vhdl

 

[FvM]

Usually a copy of numeric_std.vhd will be installed with your design compiler.