Fetch Execute Cycle Assignment Help
Fetch Executive Cycle – Definition
Identified as an important concept in the entire study of Computer Science, ‘fetch-execute’ cycle is the basic operation of a computer. In this process, computer aims at deriving the instruction right from its memory followed by its execution. The same process is set on repeat mode as the computer gets booted up to or is shutdown. For students who are assigned with this crucial study topic, it is important to understand this process in detail in order to some up with relevant solutions.
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Computer Science Assignments Defining the Fetch-Execute Cycle
To begin with, students need to understand the basics as well as extensions of the Fetch-execute cycle. It can be defined as a process that has a sequence in which CPU receives instruction from program memory, followed by decoding the incoming message post which request gets carried out. With each instruction comes an address, that is taken forward by the processor from the Program Counter. This counter take charge of transporting the address and tracking instructions that CPU needs to execute.
Key Stages of a Fetch-execute Cycle
As defined above, in this basic computer operation, the system works on retrieving a program instruction fed in the memory followed by the process of establishing and executing actions needed for that specific instruction. This entire cycle is broken down into certain stages that include the fetching, decoding, and executing repeated instruction as the computer is in operation. These stages are described in detail below:
- Stage 1 – The PC has the address of the memory location from where the preceding instruction needs to be fetched
- Stage 2: The address is copied from the system to MAR through the address bus
- Stage 3: The contents also remarked as instruction fed at the memory location, termed as address in MAR gets copied into the MDR
- Stage 4: Post this, the instruction already fed in the MDR is proceeded to get copied and placed into CIR
- Stage 5: In the last few stages, the value in the PC is increased by 1 to enable its pointing at next instruction that needs to be extracted
- Stage 6: In the last phase, instruction gets finally decoded and executed. This is done by transmitting signals with the help of control bus to other various system components
- Stage 7: The process is repeated all over again till the time computer receives the instructions
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