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Subject: Analysis of Sequential Circuits
Date: Sat, 1 Jan 2011 14:59:13 +0200
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Analysis of Sequential Circuits</TITLE>
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<P><STRONG><BIG><BIG><BIG>Analysis of Sequential=20
Circuits</BIG></BIG></BIG></STRONG></P>
<P><FONT face=3DArial>The behaviour of a sequential circuit is =
determined from the=20
inputs, the outputs and the states of its flip-flops. Both the output =
and the=20
next state are a function of the inputs and the present =
state.</FONT></P>
<P><FONT face=3DArial>The suggested analysis procedure of a sequential =
circuit is=20
set out in Figure 6 below.</FONT></P>
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            <P align=3Dleft><FONT face=3DArial>We start with the logic =
schematic=20
            from which we can derive excitation equations for each =
flip-flop=20
            input. Then, to obtain next-state equations, we insert the=20
            excitation equations into the characteristic equations. The =
output=20
            equations can be derived from the schematic, and once we =
have our=20
            output and next-state equations, we can generate the =
next-state and=20
            output tables as well as state diagrams. When we reach this =
stage,=20
            we use either the table or the state diagram to develop a =
timing=20
            diagram which can be verified through simulation.</FONT></P>
            <P>&nbsp;</P>
            <P>&nbsp;</P>
            <P>&nbsp;</P>
            <P align=3Dcenter><BIG>Figure 6. Analysis procedure of =
sequential=20
            circuits.</BIG></P>
            <P align=3Dcenter>&nbsp;</P>
            <P align=3Dcenter>&nbsp;</P>
            <P align=3Dcenter>&nbsp;</P>
            <P align=3Dcenter>&nbsp;</P>
            <P =
align=3Dcenter>&nbsp;</P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TA=
BLE>
<P><FONT face=3DArial>Now let's look at some examples, using these =
procedures to=20
analyse a sequential circuit.</FONT></P>
<P><BIG><A=20
href=3D"http://www.eelab.usyd.edu.au/digital_tutorial/part3/example1-1.ht=
m"><STRONG>Example=20
1.1</STRONG></A></BIG></P>
<P><BIG><A=20
href=3D"http://www.eelab.usyd.edu.au/digital_tutorial/part3/example1-2.ht=
m"><STRONG>Example=20
1.2</STRONG></A></BIG></P>
<P>&nbsp;</P>
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