Creating Combinational Logic (AHDL)

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

Refer to the following topics for more information on combinational logic:

• 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