Library of digital circuit development for digital system integration

Present day Digital System Designs have taken a new dimension, especially with the simulation tools such as the ModelSim and synthesis tools such as the Leonardo Spectrum. Unlike the conventional digital system designs, where the logic and functionality are optimized, modern designs call for integration of several digital sub system units for an integrated digital system. Such a scheme needs a collection of digital circuits in a library. It is prohibitive to have very many of different circuits and the associated software coding for each of them. Rather, it is advantageous to identify fundamental digital components and develop the VHDL or Verilog code for these components. Use this code recursively, to develop higher density and more complex circuits.