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DigitalFundamentals
Tenth Edition
Floyd
Chapter 9
© 2009 Pearson Education,©Upper
2008 Pearson Education
Floyd, Digital Fundamentals, 10th ed Saddle River, NJ 07458. All Rights Reserved
,The flip-flop as a storage element.
Floyd, Digital Fundamentals, 10th ed © 2009 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved
, Summary
Basic Shift Register Operations
A shift register is an arrangement of flip-flops with
important applications in storage and movement of data.
Some basic data movements are illustrated here.
Data in
Data in Data out Data out Data in Data out
Serial in/shift right/serial out Serial in/shift left/serial out Parallel in/serial out
Data in
Data in
Data out Data out
Serial in/parallel out Parallel in/parallel out Rotate right Rotate left
Floyd, Digital Fundamentals, 10th ed © 2009 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved
, Summary
Serial-in/Serial out Shift Register
Shift registers are available in IC form or can be constructed
from discrete flip-flops as is shown here with a five-bit
serial-in serial-out register.
Each clock pulse will move an input bit to the next flip-
flop. For example, a 1 is shown as it moves across.
FF0 FF1 FF2 FF3 FF4
Serial 1 1 1 1 1 1 Serial
data D0 Q0 D1 Q1 D2 Q2 D3 Q3 D4 Q4 data
input output
C C C C C
CLK
CLK
Floyd, Digital Fundamentals, 10th ed © 2009 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved
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