VHDL IEEE Packages - 2025.2 English - UG901

Vivado synthesis supports the some predefined VHDL IEEE packages, which are pre-compiled in the IEEE library, and the following IEEE packages:

• numeric_bit
  • Unsigned and signed vector types based on bit.
  • Overloaded arithmetic operators, conversion functions, and extended functions for these types.
• std_logic_1164
  • std_logic, std_ulogic, std_logic_vector, and std_ulogic_vector types.
  • Conversion functions based on these types.
• numeric_std
  • Unsigned and signed vector types based on std_logic.
  • Overloaded arithmetic operators, conversion functions, and extended functions for these types. Equivalent to std_logic_arith.
• fixed_pkg
  • For fixed variable and pin types.
  • use ieee.fixed_pkg.all;
• float_pkg
  • For floating variable and pin types.
  • use ieee.float_pkg.all;