Consider the following statements in order to perform a write operation into a specified memory location, the MDR and MAR: 1. The word to be stored into the memory location is first loaded by the CPU into MDR. 2. The address of the location into which the word is to be stored is loaded by the CPU into MAR. 3. A write signal is issued by the CPU. Which of the above statements are correct  ?

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  1. 1 and 2 only
  2. 1 and 3 only
  3. 2 and 3 only
  4. 1, 2 and 3

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Option 4 : 1, 2 and 3

The correct answer is option 4.

There are two basic memory operations. These are the memory write and memory read operations. Typically, memory read and memory write operations are performed by the central processing unit (CPU).

Three basic steps are needed in order for the CPU to perform a write operation into a specified memory location:

  • The word to be stored into the memory location is first loaded by the CPU into a specified register, called the memory data register (MDR).
  • The address of the location into which the word is to be stored is loaded by the CPU into a specified register, called the memory address register (MAR).
  • A signal, called write, is issued by the CPU indicating that the word stored in the MDR is to be stored in the memory location whose address in loaded in the MAR. 

Hence statements 1,2 and 3 are correct.

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