Working of read-only memory, Computer Engineering

Assignment Help:

Q. Working of Read-Only Memory?

A ROM is fundamentally a memory or storage device in which a fixed set of binary information is stored. A block diagram of ROM is as displayed in Figure. It comprises n input lines and m output lines. Every bit combination of input variables is known as an address. Every bit combination which comes out of output lines is known as a word. Total number of bits per word is equal to number of output lines m. Number of distinct addresses possible with n input variables is 2n.

79_Working of Read-Only Memory.png

Figure: ROM

A ROM is characterised by number of words (2n ) and number of bits (m) per word. For illustration a 32 × 8 ROM that can be written as 25 × 8 comprises 32 words of 8 bit each that means there are 8 output lines and 32 distinct words stored in unit. There are only 5 input lines since 32 = 25and with 5 binary variables we can specify 32 addresses.  

A ROM is fundamentally a combinational circuit and can be constructed as displayed in Figure below. On applying an Input I1 = 0, I2 = 0 the 00 line of decoder is selected and we will get O1 = 0 and O2 = 1 on applying I1 = 0 and I2 = 1 we will obtain O1 = 1 AND O2 = 0. This same logic can be used for creating larger ROMs.


Related Discussions:- Working of read-only memory

Database, I got a graduate level database assignment which is due at Dec 8,...

I got a graduate level database assignment which is due at Dec 8, 11:59p.m. Can you finish it on time in high quality?

Write a bash-c shell script, Write a BASH/C shell script which takes a name...

Write a BASH/C shell script which takes a name of a directory as a command line argument, and prints unique login name of the users having files in that directory. Your code should

Conversion of decimal number 10.625 into binary number, Conversion of decim...

Conversion of decimal number 10.625 into binary number ? Ans. There is integer part is 10 and fractional part is 0.625. Firstly convert the decimal number 10 in its equal bina

What is the window of the working set of a process, What is the window of t...

What is the window of the working set of a process? The window of the working set of a method is the total number in which the method had referred the set of pages in the work

Keyboard status word generator, Q.  Write short note on Interfacing Keyboar...

Q.  Write short note on Interfacing Keyboard, giving block diagram. Why do we need to introduce circuitry called Keyboard Status Word Generator?

Which is the best tool for monitoring weblogic server(wls8), WLS8 handles J...

WLS8 handles JMX but it uses weblogic execution of JMX server. It does not supports generalise sun javax API which can be used with any JVM. There are some patches available which

Recursive binary search, The implementation of a (non-recursive) binary sea...

The implementation of a (non-recursive) binary search of an array. The assumption is that a given array is sorted. We want to see if a particular value, that we'll call the target

Determine if the product of two integers are even, If the product of two in...

If the product of two integers a and b is even after that prove that either a is even or b is even. Answer: It is illustrated that product of a and b is even so let a * b = 2n.

Define about the objects, Define about the Objects The object notation...

Define about the Objects The object notation is the same in basic form as that for a class. There are three differences among the notations, these are given below: With

What qualifications needs to be an security professionals, Qualifications o...

Qualifications of security professionals For the security professionals, it is essential that they have adequate freedom to check the security measures and enforce them and

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