What do you mean by decoders, Computer Engineering

Assignment Help:

Q. What do you mean by Decoders?

Decoder transforms one kind of coded information to other form. A decoder has n inputs and one enable line (sort of selection line) and 2n output lines. Let's see an example of 3:8 decoder that decodes a 3 bit information and there is just one output line that gets value 1 or in other words out of 23 = 8 lines just 1 output line is selected. So depending on selected output line information of 3 bits can be identified or decoded.           

921_What do you mean by Decoders.png

432_What do you mean by Decoders1.png

949_What do you mean by Decoders2.png

Figure:  3×8 decoder

Please be certain while constructing logic figure wherever values in the truth table are appearing as zero in input and one in output the input must be fed in complemented form for example first 4 entries of truth table comprises 0 in I0 position and therefore I0 value 0 is passed by a NOT gate and fed to AND gates 'a', 'b', 'c' and'd' that implies that these gates shall be triggered/selected only if I0 is 0. If I0 value is 1 then not any of the top 4 AND gates can be selected. Similar kind of logic is valid for I1. Please note output line selected is named 000 or 010 or 111 etc. Output value of only one of lines would be 1. These 000, 010 denotes the label and imply that if you have these I0 I1 I2 input values labelled line would be activated for the output. Enable line is a good resource for joining two 3×8 decoders to make one 4×16 decoder.


Related Discussions:- What do you mean by decoders

Asembly language programming, Ask question #Minimum Write a program to mask...

Ask question #Minimum Write a program to mask bits D3D2D1D0 and to set bits D5D4 and to invert bits D7D6 of the AX register. 100 words accepted#

Name the approaches used for generating the control signals, What are the t...

What are the two approaches used for generating the control signals in proper sequence? Hardwired control Micro programmed control

What is the need of interrupt controller, What is the need of interrupt con...

What is the need of interrupt controller?  The interrupt controller is employed to expand the interrupt inputs. It can handle the interrupt requests from several devices and pe

Explain about programmable logic array, Q. Explain about Programmable Logic...

Q. Explain about Programmable Logic Array? Until now individual gates are considered as fundamental building blocks from that different logic functions can be derived. With the

Explain gray code, Explain Gray Code Ans. Gray Code 1.  Extreme...

Explain Gray Code Ans. Gray Code 1.  Extremely useful code. Also termed as reflected code. 2.  All gray code is different from the preceding and succeeding codes thr

Features of read-only memory, Q. Features of read-only memory? ROMs are...

Q. Features of read-only memory? ROMs are memories on which it's not possible to write data when they are on-line to computer. They can only be read. This is reason why it is k

What is the use of boot block, What is the use of boot block? For a com...

What is the use of boot block? For a computer to start running when powered up or rebooted it needs to have an initial program to run. This bootstrap program tends to be simple

Creation deductive inferences, Creation Deductive Inferences : Here we...

Creation Deductive Inferences : Here we have shown how knowledge can be represented in first-order logic or how rule-based expert systems expressed in logic can be constructed

What are the disadvantages of public key cryptography, What are the disadva...

What are the disadvantages of Public Key Cryptography? Disadvantages of Public Key Cryptography are as given below: a) It is used to encrypt a secret key that is used to e

Padovan string, how to write this program,what are the declaration and func...

how to write this program,what are the declaration and function are needed in java program in java // aakash , suraj , prem sasi kumar kamaraj college program 1 : pack

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