Question

A fetch cycle is the
1. First part of the instruction cycle
2. Last part of instruction cycle
3. Intermediate part of the instruction cycle
4. Auxiliary part of the instruction cycle

Answer 1

Correct Answer - Option 1 : First part of the instruction cycle

Steps in the instruction cycle:

• First of all, the opcode is fetched by the microprocessor from a stored memory location.
• Then it is decoded by the microprocessor to find out which operation it needs to perform.
• If an instruction contains data or operand address which is still in the memory, the CPU has to perform read operation to get the desired data.
• After receiving the data, it performs to execute the operation.

 

Correct sequence: fetch → decode → read effective address → execute