Shift registers, Other Engineering

Assignment Help:

Shift registers

A register is a number of flip-flops arranged in a circuit used for storing data.  A shift register is one that is designed to move the data along the register.  Figure shows a 4-bit register using SR flip-flops.

1406_shift register.png

Assuming the register is cleared and therefore reads 0000 and externally generated word of 1011 is to be stored in the register.  The msb is the first bit to be input, which is logic 1.  The first register has logic 1 on s, and its q output will change when the clock pulse is active.  So after the first clock pulse 1 =1, 2 = 0, 3 = 0 and 4 = 0.

When the second clock pulse is active Q1 will activate S 1 which changes Q2 to logic 1, Q1 will remain at logic 1, as a reset pulse has not yet reset it.  Q3 and Q4 will both = logic 0.  The third clock pulse resets Q1, as the input is logic 0 (reset = 1), Q2 and Q3 will be at logic 1 and Q 4 will be logic 0.

The final input is a logic 1 so Q1 = 1, Q2  = 0 (Q1 was at logic 0), Q3 and Q4 both have logic 1.  So with four clock pulses the register is loaded.  It will take four further clock pulses to empty the register.

This type of register is a Serial in - Serial out register.  Registers can also be:

  • Serial In - Parallel Out.
  • Parallel In - Serial Out.
  • Parallel In - Parallel Out. 

 


Related Discussions:- Shift registers

Electronics, design of a single stage amplifier

design of a single stage amplifier

Digit, Design the counters for the digital clock Minimum 100 words accepted...

Design the counters for the digital clock Minimum 100 words accepted#

Need help with a financial management quiz, Would you be able to assit me w...

Would you be able to assit me with a 40 question, multiple chioice quiz today ?

Inspection of casting, Inspection of casting           Visual inspe...

Inspection of casting           Visual inspection         Inspection for dimensional accuracy.            Sound test            Pressure test          Impact te

Nicol Prism., Explain the construction of nicol prism and its function.

Explain the construction of nicol prism and its function.

Econometrics coursework, Hello this is Lee, I have an Econometrics coursewo...

Hello this is Lee, I have an Econometrics coursework to be helped by some experts from your company. Please send me your reply asap Lee

Metal cutting tool, how to design a circural form tool on drawing sheet?

how to design a circural form tool on drawing sheet?

#magnetic circuit, an iron ring with amean dia of 50 cm has an air gap of 1...

an iron ring with amean dia of 50 cm has an air gap of 1mm awinding of 200 turns if the permeability of the iron is 400 when a circuit of 1.25A flows through the coil find the flux

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd