1. Computer ArchitectureThe Concept Ola Flygt Växjö University http://w3.msi.vxu.se/users/ofl/ Ola.Flygt@msi.vxu.se +46 470 70 86 49

2. The Concept of Computer Architecture • Evolution and interpretation • Levels of abstraction • Hierarchical framework • Extensions • Description of computer architectures CH02

3. Evolution of the concept of computer architecture • Computer architecture (programmer’s view) • the structure of a computer that a machine language programmer must understand to write a correct (timing independent) program for the machine • Computer organization (implementer’s view) • actual hardware structure and realization • Hierarchical, multilevel description • electronic circuit, logic design, programming, processor-memory-switch • Functional specification and hardware implementation

4. Recent interpretation of the concept • Computer architecture • Underlying computational model • von Neumann, dataflow, … • Level of consideration • micro machine, processor, computer system • Scope of interest • functional specification, implementation

5. The concept of computer architecture • Multilevel hierarchical framework with two types • Abstract architecture • Concrete architecture • The Concrete arch. Is the realization of the Abstract arch. at a certain level

6. Examples of architectures

7. Examples of architectures

8. Examples of architectures

9. Examples of architectures

10. Examples of architectures a Multilevel hierarchical framework

11. Hierarchical description of digital systems • 1. Operating system • 2. Computer system • 3. Processor • 4. Functional block • 5. Circuit • 6. Circuit elements

12. Description of computer architectures

13. A brief overview of general purpose ADLs • VHDL • Very high speed integrated circuits Hardware Definition Language • formal description used by simulation tools • circuit, logic, functional, algorithmic, architectural

14. The design space and its representationUsing DS-trees • A “consists of” B and C • A “can be performed by” B or C • A “can be executively performed by” B or C