The main purpose in posting here is to give an explanation of the introduction to build a digital circuit using schematic. As you can see in this post, a combinational digital circuit has been built by the behavioral VHDL code with circuit refer to this post.
Sometimes the electronic hobbyist prefer to use shematic method to build a digital circuit.. Perhaps the reason, a more seemingly obvious how it works compared behavioral. However, the behavioral also preferred because it is more compact, especially for complex circuits. But it is also possible to build a complex circuit by combinations of behavioral and schematic. This method will be more cool and easy to use, because a digital circuit created by behavioral can be converted into block of schematic and look like a digital component.
I will explain in step by step to create a combinational digital circuit using the existing library of digital gates in the ISE program. Basic to build logic circuits using schematic shown in the following video:
Build a complex digital system using the schematic as a whole is very difficult. ISE permit to build a digital system is a mixture between the Behavioral and Schematic. Each module should be built in behavioral because it can be done in detail. Then each module can be converted to a schematic symbol and will be seen as digital components. Each module is converted to a schematic symbol, you can imagine the result is a digital component in accordance with needs.
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