#### Read Microsoft Word - Lab 5 Prelab.doc text version

`Switching &amp; LogicSpring 2008jeg/Rev 1Lab 5 -- Pre-Laboratory ExerciseWe will try to understand the inner working of counters using state diagrams and timing diagrams in this pre-lab.State DiagramA state diagram is a graphical representation of the states or unique output combinations from a group of related flip-flops. In the laboratory exercise decade down counters will be designed. The state diagram for this counter using decimal notation is shown in Figure 1.9 0ClkClk8Clk7Clk1State Transition ConditionClk6Clk2Clk Clk5Clk Clk3 4Figure 1 Decimal Counter State Diagram1Switching &amp; LogicSpring 2008jeg/Rev 1This page intentionally left blank,2Switching &amp; Logic Group Members: ____Spring 2008jeg/Rev 1_________________________________________________________________________________ ________________________________________________ Laboratory Day ____________________________________ (Mon, Tue, Wed, Thur)In the space below redraw decimal state diagram with the states translated from decimal to binary notation.CLKQ3Q2Q1Q0The states in binary notation represent the outputs of four D flip-flops designated as Q3, Q2, Q1 and Q0 respectively. The Clk transition condition indicates that the counter only changes state on the leading edge of the counter clock pulse.3Switching &amp; LogicSpring 2008jeg/Rev 1Timing DiagramA timing diagram can be drawn that shows the value of Q3 through Q0 as it develops with each rising clock transition. The values are drawn with time evolving in a left to right manner. Complete the time diagram for the decade counter that was started in Figure 2. Note the state of any of the bits may only change on the rising edge of the clock pulse.9 8 7 6 5 4 3 2 1 0Clk Q3 Q2 Q1 Q0 TimeFigure 2 Decade Counter Timing DiagramComplete this pre-lab and turn into the laboratory assistant on entering the laboratory.4`

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Microsoft Word - Lab 5 Prelab.doc