Why we use addressing schemes, Computer Engineering

Assignment Help:

Q Why we use addressing schemes?

An operation code of an instruction tells the operation to be performed. This operation is executed on some data stored in memory or register. Operands can be specified in one of the 3 basic forms which are register, immediate and memory.

Though, why addressing schemes? The question of addressing is connected with how operands are interpreted. We can say in other wordsthat the term "addressing schemes" refers to techniqueused for specifying operands. There are a multitude of instruction formats and addressing schemes. Selecting which schemes are available will affect not only the ease to write compiler but will also consider how efficient the architecture can be?

All computers use more than one addressing schemes to provide programming flexibility to user by offering facilities likeloop control,pointers to memory, indexing of data and program relocation as well as to decrease the number of bits in operand field of instruction. Providing a variety of addressing modes can help decrease instruction counts though having more modes also raises the complexity of machine and in turn can raise the average Cycles per Instruction (CPI). Before we discuss the addressing modes let's consider the notations being used in this section. In description which follows the symbols A, A1, A2 ...... etc. indicate the content of an operand field. So Ai may refer to a memory address or data. In case operand field is a register address then symbols R, R1, R2,... etc., are used. If C indicates the contents (either of an operand field or a register or of a memory location) then (C) indicates the content of the memory location whose address is C. 


Related Discussions:- Why we use addressing schemes

Explain bootp (boot strap protocol), Explain BOOTP (Boot Strap Protocol). ...

Explain BOOTP (Boot Strap Protocol). TCP or IP designer observed that several of the configuration steps could be combined in a single step if a server was capable to supply mo

State the process of development of object oriented analysis, The Process o...

The Process of Development The approach to development can be an iterative one. It involves repeated refinement of the object model. The process needs to be controlled by an a

What are the steps in a bdc session, What are the steps in a BDC session? ...

What are the steps in a BDC session? The first step in a BDC session is to recognize the screens of the transaction that the program will process.  Next step is to write a pro

Explain the use of wire-center have any influence, Does the use of wire-cen...

Does the use of wire-center have any influence on the performance of a token ring? Explain. One problem along with a ring network is as if the cable breaks somewhere, the ring

What is a null object in c++, It is an object of a number of classes whose ...

It is an object of a number of classes whose purpose is to indicate that a real object of that class does not exist. One common use for a null object is a return value from a membe

Smallest and largest integer , A given microprocessor has words of 1 byte. ...

A given microprocessor has words of 1 byte.  What is the smallest and largest integer that can be characterized in the following representations?   a) unsigned b) sign- ma

4bit counter using JK flip flop and unique sequence, Need to build a 4bit J...

Need to build a 4bit JK flip flop counter with a unique patter. 6 4 2 5 3 1 F C B A

Explain syntax of recursion, Syntax of recursion int fib(int num) /*...

Syntax of recursion int fib(int num) /* Fibonacci value of a number */ {      switch(num) { case 0: return(0); break; case 1: return(1); break; default:  /* Incl

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