COMPUTER SCIENCE AND ENGINEERING
COMPUTER ARCHITECTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Contents of memory are copied to MDR
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Contents of MDR are copied to memory
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Contents of memory are copied to MAR
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Contents of MAR are copied to memory
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Detailed explanation-1: -The Memory Buffer Register (MBR) contains a copy of the designated memory location specified by the MAR after a “read” or the new contents of the memory prior to a “write".
Detailed explanation-2: -Answer: MAR holds the memory location of data that needs to be accessed. When reading from memory, data addressed by MAR is fed into the MDR (memory data register) and then used by the CPU.
Detailed explanation-3: -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.
Detailed explanation-4: -memory data register (MDR)-holds the contents found at the address held in the MAR, or data which is to be transferred to primary memory. current instruction register (CIR)-holds the instruction that is currently being decoded and executed.