Download Universal Shift Register used for data load and Transfer operation

An-Najah National University
Faculty of Engineering
Department of Computer Engineering
“Digital lab.”
Experiment No. (9)
" Shift Registers(2)""
Prepared by:
Ahmad Daraghmeh
Mohammad Anan
Osayed Mos’ab
Submitted to:
Dr:Ashraf Armoush
Monday
(2-5)
Submission Date
2012-4-2
Introduction:
Simple combinational logic chips do not have the ability to remember
or store a value from one time to the next . However, this can be
accomplished by a sequential device , such as a flip flop, counter or
register. These devices have more complicated logic in which the
output depends not only on the current input, but also on one or more
past value. As an example , in this experiment we will work with a shift
register . A shift register stores a specific number of bits . when the
voltage applied at the clock input to the chip goes from low to high ,
each bit is shifted one bit either left or right.
Objectives :
To become familiar with the operation of shift register , more
specifically:
1- To learn about the functions and properties of the universal
shift register .
2- To gain the experience in using shift registers for performing :
data insertion, feedback operation and register transfer operation.
Equipments ,apparatus and IC's required :
In this experiment we used different apparatus like:
123456-
Power supply.
Cables and wires.
Breadboard.
Resistors & Capacitors.
LEDS.
555.
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7- 74194.
Fig(1):cutter
Fig(2):cables
3
Fig(5):Power supply.
Fig(6): 74LS194A
Part(1):Universal Shift Register used for data load and
Transfer operation :
In this part we will work specifically with 74LS194A. the 74LS194A
is 4-bit bidirectional universal shift register with parallel load, shift
left and shift right operations.(Look to data sheet and pin layout
for this shift register). Using the information from the data sheet of
the 74LS194A, fill the operation table of the 74LS194A. the
operation table should show the four combination of the logical
values of the mode control signals S0 and S1 on the lift side, and the
description of the corresponding register operations on the right
side. You will need this values to complete this experiment.
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Operation code
Register operation
S0
S1
0
0
If any value be input the output will be no change
0
1
Shift input to left
1
0
Shift output to right
1
1
Load parallel input to output A B C D>QA QB QC QD
Fig(7): Universal Shift Register used for data load and Transfer
operation.
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Figure(7) shows a sequential logic circuit in which two universal
shift register 74LS194A are interconnected to perform parallel
load, data transfer and shift left and right operations.
PROCEDURE:
1). Build the two feedback shift register as shown in figure(7)
and use switches S0 S1 to perform the following:
a) In parallel load Register RL and RR with BCD and 9
respectively. What are the values of S0 S1? What Register
operation is this called?
S0=1&S1=1, and this operation called load.
b) Keep the contents of both register unchanged as given in part
a for 10 clock periods. What are the values of S0 and S1? What
register operation is this called?
S0=0 & S1=1,and this operation called shift left.
c) Use the shift right operation to transfer the content of the
register RL to while concurrently transferring the contents of the
register RR to RL, What are the values of S0 and S1?
S0=1 & S1=0.
d)Use the shift left operation to transfer the content of register
RL to RR while concurrently transferring the contents of the
register RR to RL. What are the values of S0 and S1?
S0=0 and S1=1.
e)Use the shift left operation to transfer the contents of register
RR to RL while concurrently transferring 1 into register RR.
What are the values of S0 and S1?
S0=1 and S1=1.
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Results and Conclusions :
In this experiment we designed 4-bit universal shift register. and
we used different types of IC'S like 74LS194 , resistor and
capacitors. and we used 555 clock generator to make pulse of the
universal shift register. And in this experiment we designed new
types of shift register that was learned it in digital course and we
used different choices to shift the contents of registers left and
right as shown previously in the procedure.
References:
1. http://www.google.ps/imgres?q=power+supply+agilent&um=1&hl=ar&client=opera
&rls=en&channel=suggest&biw=1333&bih=646&tbm=isch&tbnid=SUVCjedLpFG4M:&imgrefurl=http://www.agilent.com/find/u3400-u
2. http://www.google.ps/imgres?q=breadboard&um=1&hl=ar&client=opera&rls=en&ch
annel=suggest&biw=1333&bih=646&tbm=isch&tbnid=_n0CsYctTQA34M:&imgref
uG5gLDFYcWjM&imgurl=http://store.curiousinventor.com/media/catalog/product/c
ache/1/image/9df78eab33525d08d6e5fb8d27136e95/b/r/bread_board_1.jpg&w=500
&h=320&ei=Y2glT_HtAsrF0QX4qo3OCg&zoom=1
3. http://www.google.ps/imgres?q=wire+case+breadboard&um=1&hl=ar&client=opera
&rls=en&channel=suggest&biw=1333&bih=646&tbm=isch&tbnid=sRZV5CMLVhe
Q7M:&imgrefurl=http://shop.chip45.com/Electronics-
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