Computer Architecture Lecture – 1

 Computer Organization and Design (third edition)  David A. Patterson   John L. Hennessy Computer Organization (fifth edition)   Carl Hamacher  Zvonko Vranesic  Safwat Zaky Class Lectures 4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

   Computer Structure/Architecture Operation of Instruction set Execution Pipelining 4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

 Maximum three class tests : 1.

One will be in very usual way 2.

3.

One will be sudden ( The easiest one, small syllabus, no memorizing, but the date is unknown to me too!!!

) If 60% of you(that is, 36 ) get 80% marks( 32 ) in above two class tests, only then 3 rd class test will be taken, which will be open material and the hardest one!!

4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

     From this week to 6 th Week.

Total class = 18 + 2 = 20 Total lecture <= 16 2+1 = 3 == ANOTHER WEEK!!!

(kept in hand unfortunately, due to the political and weather condition of Bangladesh) Class time <= 40 minutes. 4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

 Definition of C.A.:  The Architecture of a computer can be defined as the design of the task-performing part of it.

 It also includes the overall fundamental working

1

principle of the internal logical structure

2

of a computer system.  So, computer architecture includes : 1.

2.

Instruction set architecture Machine architecture 4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

 Objectives of a Computer architect:  To select, design, interconnect and engineer hardware components of various levels of computer that meet functional performance and programmability maintaining cost and availability constraint.

 So, the total coordination of abstract levels of a processor under changing forces, involving design, measurement and evaluation is within the objectives of a computer architect.

4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

 Instruction set architecture is the attributes  of a computing system as seen by the assembly language programmer or compiler.

This includes :  Instruction Set (what operations can be performed?)  Instruction Format (how are instructions specified?) 4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

 Data storage (where is data located?)  Addressing Modes (how is data accessed?)  Exceptional Conditions (what happens if something goes wrong?) 4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

  Machine organization is the view of the computer that is seen by the logic designer.

This includes :  Capabilities & performance characteristics of functional units (e.g., registers, ALU, shifters, etc.).  Ways in which these components are interconnected  How information flows between components 4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

 Logic and means by which such information flow is controlled   Coordination of functional units Typically the machine organization is designed to meet a given instruction set architecture.

However, in order to design good instruction sets, it is important to understand the how the architecture might be implemented. 4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

 Functional Units :  A computer consists of 3 main functionally independent units : 1.

2.

3.

Input/output(I/O) unit Memory Processor  The I/O unit and the processor is again sub divided into 2 parts.

4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

 The 2 parts of I/O unit : 1.

Input 2.

Output  1.

2.

The 2 parts of processor: Arithmetic and Logic unit Control unit  So, there are main computer. 5 functional units of a 4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET

Input Arithmetic and logic Memory 4/28/2020 Output I/O Functional units of a computer.

Sumaiya Iqbal, Lecturer, CSE, BUET Control Processor

 Class Lecture 4/28/2020 Sumaiya Iqbal, Lecturer, CSE, BUET