Cisc and risc processor technologies
Cisc and risc processor technologiesTABLE OF CONTENTS
1. Abstract 2
2. Introduction 3
3. CISC Technology 4
3.1 Characteristics 4
3.2 The Advantages of CISC 5
3.3 The Disadvantages of CISC 5
4. RISC Technology 6
4.1 Characteristics 6
4.2 The Advantages of RISC 7
4.3 The Disadvantages of RISC 8
5. Conclusion 9
6. References 10
1.Abstract
This report describes the CISC and RISC technologies. Describes the characteristics of each of these technologies. Also Advantages and disadvantages of both technologies are described. So the reader will be able to recognize and compare both technologies.
This report describes the "CISC" style of computer processor architecture. Which is the most commonly used style today. By reading this report you will be able to define the term CISC. Be able to list the characteristics of a CISC instruction set and also the decisions and philosophies which led to the development for this technology.
Also this report describes the RISC style of computer processor architecture. Which is replacing CISC in some uses. Define the term RISC. Describe the characteristics of RISC technology. And also point the advantages and disadvantages of using this technology.
At the end of this report you will also be able to describe the major differences between a CISC instruction set and a RISC instruction set and list some key advantages and disadvantages of RISC as compared to CISC
2. Introduction
Speeding up a computer system involves many different strategies. By speeding up the input and output devices in different peripherals. But the most fruitful place to speed up the system is by designing a faster processor. This report will explain "CISC" and "RISC" technologies and show how computer designers have tried to do speed up processors by implementing these tow technologies.
CISC technology was not known as a processor technology back in time. It was just the way that manufactures designed processors. So the Term CISC was define just when the RISC philosophy was adopted.
In the mid-1970�s advances in technology began to reduce the difference in speed between main memory and processor chips. As memory speed increased, and high level languages displaces assembly language the major reasons for Complex Instruction Set Computers began to disappear and computer designers began to look in at ways computer performance could be optimized beyond just making faster hardware. That is when RISC technology started to emergence.
3. CISC Technology
CISC as defined by [WISCISC1] stands for Complex Instruction Set Computer, is a philosophy for designing chips that are easy to program and which make efficient use of memory. Each instruction in a CISC instruction set might perform a series of operations inside the processor. This reduces the number of instructions required to implement a given program, and allows the programmer to learn a small but flexible set of instructions.
Since the earliest machines were programmed in assembly language and memory was slow and expensive, the CISC philosophy made sense, and was commonly implemented in large computer systems.
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