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Logic is combinatorial if outputs at a specified time are a function only of the inputs at that time. Combinatorial logic is implemented in AHDL with Boolean expressions and equations, truth tables, and a variety of megafunctions and macrofunctions. Examples of combinatorial logic functions include decoders, multiplexers, and adders.

Information on combinatorial logic is available in the following topics:

• Implementing Boolean Expressions & Equations


• Declaring Nodes


• Defining Groups


• Implementing Conditional Logic
  • Using If Then Statement Logic
  
  
  • Using Case Statement Logic
  
  
  • Using an If Then Statement vs. a Case Statement
• Creating Decoders


• Using Default Values for Variables


• Implementing Active-Low Logic


• Implementing Bidirectional Pins


• Implementing Tri-State Buses

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