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

Types of assemblies, How many types of assemblies are there? Private, P...

How many types of assemblies are there? Private, Public/Shared, Satellite. A private assembly is normally used by a one application, and is stored in the application's director

Determine the octal equivalent of decimal number, The octal equivalent of (...

The octal equivalent of (247) 10 is ? Ans. (247) 10 = (367) 8

What are addressing modes, What are Addressing Modes Many of instructio...

What are Addressing Modes Many of instructions that a computer actually executes during running of a program concern movement of data to and from memory. It is not possible sim

What is super scalar architecture, Super scalar architecture Pentium m...

Super scalar architecture Pentium microprocessor is organized with three execution units. One executes floating-point instructions and other two (U-pipe and V-pipe) execute in

Case x and z difference which is preferable and why, Case x, z difference, ...

Case x, z difference, which is preferable, why? CASEZ : Special version of case statement that uses a Z logic value to signify don't-care bits. CASEX : Special

Digital electronics, Draw a circuit of an NMOS inverter and explain its ope...

Draw a circuit of an NMOS inverter and explain its operation

What is monitoring-and-surveillance agents, Q. What is monitoring-and-surve...

Q. What is monitoring-and-surveillance agents? ANSWER: Monitoring-and-surveillance agents or predictive agents are intelligent agents that examine and report on equipment.

Determine about the memory stack, Memory Stack Stack could exist as a s...

Memory Stack Stack could exist as a stand-alone unit or could be executed in a random-access memory attached to the CPU. The implementation of a stack in a CPU is done by assig

Classify data networks, Classify data networks. Data Network Classifica...

Classify data networks. Data Network Classifications: Data Networks are classified as per to their geographical coverage: - Wide area networks (WANs) - Metropolitan ar

How do you traverse a btree in backward in-order, Put the node in the right...

Put the node in the right subtree Then, Put the root  Put the node in the left subtree

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