Reduced instruction set computer - risc, Computer Engineering

Assignment Help:

Reduced Instruction Set Computer (RISC):

As we discussed before most of the modern CPUs are of the GPR (General Purpose Register) type. A few instances of such type of CPUs are the, IBM 360, Intel 80x86 ,Motorola 68xxx and DEC VAX But as these CPUS were obviously better than previous accumulator and stack based CPUs they were yet lacking in various areas:

1. The instructions were of varying length from 1 byte to 6-8 bytes. It is reason of problems with the pre- fetching and pipelining of instructions.

2. ALU (Arithmetic Logical Unit) instructions could have operands that were memory locations. Since the number of cycles it takes to access memory varies so does the all instruction. It isn't good for pipelining, compiler writers and several multiple issues.

3. Most of the ALU instruction had only 2 operands where 1 of the operands is also the destination. It means this operand is cracked in the time operation or it ought to be saved before somewhere.

Therefore in the early 80's the idea of RISC was come. The SPARC project was begun at Berkeley and the MIPS project at Stanford. RISC means Reduced Instruction Set Computer. The ISA is composed of instructions that all have accurately the similar size, typically 32 bits. so they can be pipelined  and pre-fetched and successfully. All of the ALU instructions have 3 operands which are just registers. Only memory access is throughout explicit LOAD/STORE instructions. Therefore A = B + C can be assembled as:

LOAD   R1, A

LOAD   R2, B

ADD     R3, R1, R2

STORE C, R3


Related Discussions:- Reduced instruction set computer - risc

Name the concepts of object oriented, Name the concepts of Object oriented ...

Name the concepts of Object oriented There are various concepts of object oriented analysis Abstraction, Encapsulation, Identity, Modularity, Hierarchy, Typin

Explain fundamental models of inter process communication, Explain the two ...

Explain the two fundamental models of inter process communication. Two kinds of message passing system are given as: (a) Direct Communication : Along with direct communicat

What is layer, What is layer? A layered system is ordered set of virtua...

What is layer? A layered system is ordered set of virtual worlds. Every build-in terms of one's below it and providing the execution basis for one above it. The objects in ever

Result extends to functions - perceptrons, Result extends to functions - pe...

Result extends to functions - perceptrons: Thus the dotted lines can be seen as the threshold in perceptrons: whether the weighted sum, S, falls below it, after then the perce

How and what data is collected - weather simulation, How and what data is c...

How and what data is collected - Weather simulation -  Sensors measure pressure, relative humidity, temperature and wind speed and wind direction -  Sensors are placed in w

Determine the objectives of object oriented analysis, Objectives of object ...

Objectives of object oriented analysis After going through this unit, you should be able to: define the concepts of the objects in the system; express desired syste

Assembly language programes, Program to calculate the value of the series 1...

Program to calculate the value of the series 1+x+x2+x3+.... +xn. Read the values of ''x'' and ''n'' from the keyboard.

Define how ptrace is used by debuggers, State how Shared Memory is used for...

State how Shared Memory is used for inter process communication. Define how ptrace is used by debuggers.  What are modules? Explain how data mapping takes place among modules

Explain the importance of computer architecture, Explain the importance of ...

Explain the importance of computer architecture Studying the architecture implies working on machine language programs. However, this isn't practical when we design a computer

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