VHDL

Modeling concept

there are 3 domains of modeling:

• function
• structure
• geometry

each provides a basic modeling concept.

a module e.g. a register is an entity, it's inputs ans outputs are called ports. an architecture is the internal implementation of an entity. it describes the behavior of an entity. architectures includes only processes, collection of actions which are executed in sequences.

types of action that can be performed:

• evaluating expressions
• assigning variables and values
• conditional and repeated execution
• subprogram calls