In my book, “VHDL for Logic Synthesis“, I make extensive use of the VHDL-2008 extensions for fixed and floating-point numbers.
However, many synthesis systems do not necessarily provide these packages. In this case, it is still possible to use them by downloading them from VHDL.org.
To make this simpler, I have added download links below to the packages:
- Cadence NC VHDL
- Cadence RC
- Xilinx 11
Each variant has notes included explaining how to use them with that particular synthesiser or simulator.