COMPUTER SCIENCE AND ENGINEERING
COMPUTER ARCHITECTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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MDR only
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To MDR first and then, to CIR
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To MDR first and then, to PC
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MAR only
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Detailed explanation-1: -As the data fetched during the fetch stage is an instruction, it is copied into the instruction register (IR).
Detailed explanation-2: -The instruction/data held in the MBR/MDR is copied into the CIR . The instruction/data held in the CIR is decoded and then executed. Results of processing are stored in the ACC . The cycle then returns to step one.
Detailed explanation-3: -In computing, the instruction register (IR) or current instruction register (CIR) is the part of a CPU’s control unit that holds the instruction currently being executed or decoded.
Detailed explanation-4: -Answers. -instruction for fetch cycle: So, PC, IR and address register are used.
Detailed explanation-5: -Steps Involved in Fetch Cycle Step 1: The address in the program counter is transferred to the memory address register (MAR), which is the only register connected to the address lines of the system bus.