Libraries

Numeric Operations

Warning

Never mix these Libraries!!!

Use numeric_std - it's the proper IEEE standard and is more recent.

library ieee;
  use ieee.std_logic_1164.all;
  use ieee.numeric_std.all;

-- Never mix these libraries

library ieee ;
  use ieee.std_logic_1164.all ;
  use ieee.std_logic_arith.all ;
  use ieee.std_logic_unsigned.all ;

IEEE

Standart IEEE Libraries can not be found in every tool because of their copyright notice. Nevertheless they can be downloaded from the IEE Webpage

ieee libraries

• math_complex.vhd
• math_real.vhd
• numeric_bit.vhd
• numeric_std.vhd
• std_logic_1164.vhd
• std_logic_arith.vhd
• std_logic_misc.vhd
• std_logic_signed.vhd
• std_logic_textio.vhd
• std_logic_unsigned.vhd

STD

std libraries

• standard.vhd
• textio.vhd

Synopsys

synopys libraries

• arithmetic.vhd
• attributes.vhd
• types.vhd