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Module 3: Laboratory 2B: Shift Registers
Objectives
The objectives of this experiment are to:
Examine how flip flops are combined to make shift registers.
Examine the operation of a pseudorandom number generator.
Introduction
The same flip flops that can be used to make a counter can be used to make a shift register. The
difference is how the flip flops are clocked and what mode they operate in. In this exercise we
will examine several shift register circuits and applications.
Procedure
1. Load the circuit EGB-1.MS7, shown in Figure 6B. 1.
NN
hey . 6 Clear
Figure 6B.1: 4-bit D-type shift register
2. Press the "D' key slowly and irregularly to load different patterns into the shift register. Now
and then press the 'C' key and see what happens.
3. How many clock pulses does it take for a bit to move through the shift register?
4. Convert the 4-bit D-type shift register into a 4-bit JK-type shift register. Sme hints:
Connect Q of one stage to J on the next stage.
Connect Q' on one stage to K on the next stage.
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Module 3: Laboratory 28: Shift Registers
Module 3: Laboratory 2B: Shift Registers
Clock all flip flops at the same time.
The J and K inputs on the first flip flop should always be different.
2. SV
2. 6V 2.5V
2. SV
shift register.
5. Compare the way data is clocked into the D-type shift register with that of the JK flip flop
St
6. Load the circuit EGB-2.MS7, shown in Figure 6B.2.
ENORZ
24.7kOhm
SV
LOS CLK
74195N
4. THOF
500 Hm
5 V
JOP CLK
74195N
Figure 6B.3: Pseudorandom pattern generator
4. 710hm
Key . L
9. Simulate the circuit. Record the output patterns in Table 6B. 1.
Pattem
ABCD
Pattern
ABCD
100 HE
SV
9
2
10
Figure 6B.2: 74195 parallel-load shift register
3
7. Simulate the circuit. The shift register should eventually fill with Is. When this happens, press
4
12
L' once. Does the output instantly change to a new pattern? After a few seconds, press 'L'
S
13
again. Now what happens? Examine the help information for the 74195 to see how the shift/load
input operates.
6
14
15
8. Load the circuit EGB-3.MS7, shown in Figure 6B.3.
Table 6B.1: Pattern generator output patterns
10. Experiment with different feedback inputs for the XNOR gate. What do you find?
Discussion:
While reviewing your data and results, provide detailed answers to each of the following:
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Module 3: Laboratory 28: Shift Registers
1. Why does the pattern in a shift register shift only one bit position each time it is clocked?
2. What pattern is not output by the pseudorandom pattern generator?
3. Which shift registers covered in this experiment require a clock pulse to load data?
4. Explain how to build a 20-bit shift register.

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