Machine cycle.

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Presentation transcript:

Machine cycle

What is the machine cycle? 4 steps that processors follow to execute program instructions.

Step 1 The control unit fetches the instruction from the memory

Step 2 The control unit decodes the instruction and directs the necessary data to the ALU

Steps 1 and 2 are called: instruction time or I-time

Step 3 The ALU executes the arithmetic or logical instruction.

Step 4 The ALU stores the result of this operation in memory or in a register

Steps 3 and 4 are called: execution time or E-time

The combination of I-time and E-time is called: the machine cycle.