What is base register addressing, Computer Engineering

Assignment Help:

Q. What is Base Register Addressing ?

An addressing technique in which content of an instruction specifies base register is added to address field or displacement field of the instruction. (Refer to Figure below).The displacement field is taken to be a positive number. For illustration if a displacement field is of 8 bits then a memory region of 256 words beginning at address pointed to by base register can be addressed by this mode. This is same as indexed addressing scheme besides that role of Address field and Register is reversed. In the indexing Address field of instruction is fixed and index register value is changed while in Base Register addressing Base Register is common and Address field of the instruction in different instructions is changed. In this particular case:

EA = A+ (B) 

D = (EA)

(B) Refers to the contents of a base register B.

1861_What is Base Register Addressing.png

Contents of the base register can be changed in the privileged mode only. No user is permitted to alter the contents of the base register. Base-addressing scheme offers protection of users from one another.

This addressing technique is generallyused to relocate the programs in memory particularly in multiprogramming systems in which only value of base register needs updating to reflect beginning of a new memory segment. 

Like index register a base register can be a general-purpose register or a special register reserved for base addressing.


Related Discussions:- What is base register addressing

Define terminal symbols, Define Terminal symbols? Terminal symbols: T...

Define Terminal symbols? Terminal symbols: These are literal strings forming the input of a formal grammar and can't be broken down in slighter units without losing literal m

What is mini computer, Q. What is Mini computer? The term minicomputer ...

Q. What is Mini computer? The term minicomputer introduced in 1960's when it was realized that numerous computing tasks don't need an expensive modern mainframe computers howev

How many instructions in a computer, Q. How many instructions in a Computer...

Q. How many instructions in a Computer? A computer can have a vast number of instructions and addressing modes. Older computers with the growth of Integrated circuit technolog

Two - bit correlating predictor, The history file, history.txt, is the bran...

The history file, history.txt, is the branch history of a run of the gcc compiler (the first field is the address of the branch instruction, the second field is the target branch a

State the term in detail $strobe, State the term in detail $strobe $str...

State the term in detail $strobe $strobe. This task is very similar to $display task except for a slight difference.  If many other statements are executed in same time unit as

Define the concept of inheritance, Define the concept of Inheritance I...

Define the concept of Inheritance Inheritance is property of reusing the code within the object oriented development. While modelling, we look at the all the classes, and try

Describe the importance of micro-programming, Question: (a) Describe t...

Question: (a) Describe the importance of Micro-Programming and point out one area where Micro-Programming is extensively used. (b) Below is a diagram of an 8086 processor.

By which except ions of type error in java are handled, Except ions of type...

Except ions of type error in JAVA are handled by? Except ions of type error in the JAVA are handled through JAVA run time environment.

Do we require an x server to run in batch mode for gimp, Yes, you have to h...

Yes, you have to have some form of X server (unless you're running Windows, of course). It requires an X server for image processing, and for font manipulation. Though, if you wish

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