TOPIC : Introduction to Functional Modeling UNIT 1: Modeling Digital Circuits Module 1 : Functional Modeling

Contents of the module Introduction to functional modeling Different Functional Models ◦ Truth table ◦ Primitive cube ◦ Binary Decision Diagram ◦ Programming model ◦ RTL model

Functional Model Introduction A functional model of a digital system is a representation of its logic function. Any digital system can be represented by a black box which processes the input to produce its output. The value of the outputs vary with inputs and a certain delay exists The logic function is the input-output mapping that deals with the value transformation.

Functional modeling Tells the relationship between input and output values of a circuit. It does not talk about any timing aspect. Simulation implies calculation of the output (response) of a circuit. Functional models provide the information for simulation. It can be done at two levels ◦ Logic level ◦ RTL(program) level

Different Functional Models Logic Level ◦ Truth tables ◦ Primitive cubes ◦ Binary decision diagrams RTL Level ◦ Programming model ◦ RTL model