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THE COMPUTER SYSTEM TOPIC 1:COMPUTER FUNCTIONS AND…

- - - - • The connections that carry control information
      - between the CPU and other devices within the
      - computer is called Control Bus.
      - • The control bus carries signals that report the
      - status of various devices.
      - Example: This bus is used to indicate whether
      - the CPU is reading from memory or writing to
      - memory.
      - Bus Width
        
        • The width of the data bus has an impact on
        
        system performance:
        
        􀀀 The wider the data bus, the greater the number of
        
        bits transferred at one time.
        
        • The width of the address bus has an impact on
        
        system capacity:
        
        􀀀 The wider the address bus, the greater the range
        
        of locations that can be referenced.
        
        Analogy
        
        • One big program will have many small tasks
        
        • Each task have its own instruction set
        
        • Control unit is the one that will manage / control
        
        which instruction set to be executed in which
        
        order
        
        • T1, T2, T3
        
        • -T3, T1, T2
        
        • Control bus? – carry information of instruction set
        
        sequence to be executed.