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Phrases Previous Year Questions (PYQs)
Phrases Central Processing Unit (CPU) PYQ
To access the I/O devices the status flags is continuously checked in
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Solution
Programmed I/O: In program-controlled I/O, the processor program controls the complete data transfer. So only when an I/O transfer instruction is executed, the transfer could take place. It is required to check that device is ready/not for the data transfer in most cases. Usually, the transfer is to & from a CPU register & peripheral. Here, CPU constantly monitors the peripheral. Here, until the I/O unit indicates that it is ready for transfer, the CPU wait & stays in a loop. It is time-consuming as it keeps the CPU busy needlessly.
If a processor clock is rated as million cycles per second, then its clock perios is:
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Solution
The time required for fetching and execution of one machine instruction is:
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Solution
Time for Fetch & Execute
Definition:
The time required to fetch and execute one machine instruction is called a
Machine Cycle / CPU Cycle.
Includes:
- Instruction fetch
- Instruction decode
- Operand fetch (if any)
- Execution
- Result store (if any)
✅ Final Answer: Machine Cycle / CPU Cycle.
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