Fixed and floating point packages used by the Vivado simulator are the new enhanced IEEE standard packages introduced in VHDL-2008. You can use the older VHDL-93 standard fixed or floating package for Vivado synthesis. However, you must edit your VHDL source file for simulation.
For example, if you are using the following syntax for the fixed package in Vivado synthesis:
library ieee;
use ieee.fixed_pkg.all;Change this to the following syntax in VHDL-2008 for use in the Vivado simulator:
library ieee_proposed;
use ieee_proposed.fixed_pkg.all;See Fixed point Support in the Vivado Design Suite User Guide: Synthesis (UG901) for more information about fixed and floating packages in Vivado Synthesis.
Similar changes apply to the floating package too.