Focus on higher level abstraction and focus on just the logical function and abstract the gates

A block of hardware with inputs and outputs is a module.

Behavior

• describes what the module does
• Some button that creates an open or closed light, the behvaior module is how input 1 will make light on, and 0 will make light off
• Compiutes a boolean function from

structural module

• describes how a module is built from pieces

module fn (input a, b, c, output y):

assign y = ~a & ~b & ~c | a;

assign indicates that it is a combinational circuit. We are setting inputs a b c to output y

Interface is important and defines good modularity for the behavior or structure of a hardware component

Purpose of HDL

For logic simulation

• inputs are applied, outputs are applied to verify the computation is correct

For synthesis