COMPUTER SCIENCE AND ENGINEERING
COMPUTER ARCHITECTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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CIR contains the next instruction to be executed.
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CIR contains the instruction that is executed currently.
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CIR contains the address of the next instruction that is to be executed.
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CIR contains the address of the instruction that currently executed.
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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: -current instruction register (CIR)-holds the instruction that is currently being decoded and executed. accumulator (ACC) – holds the data being processed and the results of processing.
Detailed explanation-3: -A program counter is a register in a computer processor that contains the address (location) of the instruction being executed at the current time.
Detailed explanation-4: -It is used to hold the memory addresses of data and instructions. It accesses data and instructions from memory during the execution phase of an instruction. For example, the CPU wants to store some data in the memory or to read the data from the memory. It places the address of the-required memory location in the MAR.
Detailed explanation-5: -Detailed Solution. The correct answer is Memory Buffer Register. Memory Buffer Register holds the contents of data or instruction read from, or written in memory.