Computer Subsystems - The internal bus architecture

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Computer Subsystems.

Task 1

  1. The internal bus architecture

It is a collection of wires, which the data is transmitted from one part to the other. The internal bus connects all the internal computer components to the CPU and main memory. There are two parts of any bus these are an address bus and the data bus. The size of the bus is measured in width. This is important because it determines the amount of data being transmitted. For example a 16 bit bus can transmit 16 bits of data. Nearly all the PC’s today include a local bus for which is needed for faster processing for things such as video data.

  1. ALU

ALU stands for Arithmetic-Logic Unit this part of the CPU this part carries out arithmetic and logic operations on the operands in the computer instruction words. In some CPU’s the ALU is split in to the separate Arithmetic unit and the Logic unit. In most cases the ALU has direct input an output access to the main memory, input and output devices.

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  1. The Fetch – Decode – Execute Cycle.

This cycle is executed when a computer program is activated; the program is a set of instructions. This set of instructions will normally be stored in the Main Memory. It is the job of the processor that controls the computer to decide what action to take with these instructions. At the beginning of a program the Program Counter is set to point at the memory location where the start of the program can be found. After the first instruction has been loaded, the Program Counter is incremented to point at ...

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