DIGITAL DESIGN WITH SM CHARTS

• SM chart is also called an Algorithmic State Machine (ASM) chart.

• It is easier to understand the operation of digital system by inspection of the SM chart compared to a state graph.

Components of an SM chart

Example of a SM chart

Equivalent SM Blocks

Equivalent SM charts for combinational circuit

SM BLOCK with feed back

Different forms realization

Conversion of state graph to an SM chart

Multiplier

K

Sh

Ad

Load

Done

St

M

Add-shift control

Counter

Block diagram of the Electronic Dice Game

Flow chart for Dice game

State graph for Dice game

SM chart for Dice game

PLA table for Multiplier Controller

A+ = A’BM’K + A’BM + AB’K; B+ = A’B’St + A’BM’ + AB’; Load = A’B’St Sh = A’B’St = AB’; Ad = A’BM’; Done = AB

PLA table for Dice game