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Fetch Cycle in Computer Architecture

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Questions and Answers

What is the first step in the fetch cycle?

PC contains address of next instruction (correct)

Address placed on address bus and memory location is identified

Control unit sends memory read control signal

Result placed on data bus, copied to MBR, then to IR

What happens to the content of PC in case of an interrupt?

It is incremented by 1

It is lost

It is saved to allow resumption after interrupt (correct)

It is moved to MAR

What is the purpose of the indirect cycle?

To process an interrupt

To handle indirect addressing in an instruction (correct)

To perform a memory write operation

To fetch the next instruction

What is the role of the MAR during the fetch cycle?

It is used to place the address on the address bus Signup and view all the answers

What is the final step in the fetch cycle?

Meanwhile PC incremented by 1, preparing for the next fetch Signup and view all the answers

What happens to the right most N bits of MBR during the indirect cycle?

They are transferred to MAR, placed on the address bus and memory location is identified Signup and view all the answers

What is the purpose of the 'Decode instruction' stage in the instruction pipeline?

To determine the opcode and the operand specifiers Signup and view all the answers

In a pipelined processor, what happens when a conditional branch instruction is encountered?

The processor stalls until the branch outcome is known Signup and view all the answers

What is the purpose of the 'Fetch operands' stage in the instruction pipeline?

To fetch the operands from memory Signup and view all the answers

What is the purpose of the 'Write operand' stage in the instruction pipeline?

To store the result in memory Signup and view all the answers

What is the formula to calculate the cycle time (τ) of an instruction pipeline?

τ = max [τi] + d Signup and view all the answers

What is the purpose of the 'Fetch instruction' stage in the instruction pipeline?

To fetch the next expected instruction into a buffer Signup and view all the answers

What is the primary function of the Arithmetic and Logic Unit (ALU)?

Performing arithmetic and logical operations on data Signup and view all the answers

What is the purpose of the internal processor bus?

To transfer data between various registers and the ALU Signup and view all the answers

What is the first step in the instruction cycle?

Fetch instruction Signup and view all the answers

Why does the processor need a small internal memory?

To store temporary results Signup and view all the answers

What is the function of the control unit?

Controlling the movement of data and instructions Signup and view all the answers

What is the purpose of registers in a processor?

To store temporary data Signup and view all the answers