COMPUTER SCIENCE AND ENGINEERING
COMPUTER ARCHITECTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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PC
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MDR
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CIR
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MAR
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Detailed explanation-1: -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-2: -During the decode stage, the control unit (CU) will decode the instruction in the CIR. The CU then sends signals to other components within the CPU, such as the arithmetic logic unit (ALU) and the floating point unit (FPU).
Detailed explanation-3: -The instruction or data held in that memory address is sent along the data bus to the memory data register (MDR). The instruction or data held in the MDR is copied into the current instruction register (CIR). The instruction or data held in the CIR is decoded and then executed .
Detailed explanation-4: -current instruction register (CIR)-holds the instruction that is currently being decoded and executed.
Detailed explanation-5: -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 .