Memory address register
This article needs additional citations for verification. (July 2016) (Learn how and when to remove this template message)
In a computer, the Memory Address Register (MAR) is the CPU register that either stores the memory address from which data will be fetched from the CPU, or the address to which data will be sent and stored.
In other words, 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. When writing to memory, the CPU writes data from MDR to the memory location whose address is stored in MAR. MAR which is found inside the CPU goes either to the RAM(Random Access Memory) or Cache.
In general, MAR is a parallel load register that contains the next memory address to be manipulated. For example, the next address to be read or written.
However the MAR is becoming more rare in newer computer models as newer architectures such as the Stevens architecture is becoming increasingly popular in Apple products and Acer
- "Understanding the MAR and the MDR". www.cs.umd.edu. Retrieved 2017-01-20.
|This computer hardware article is a stub. You can help Wikipedia by expanding it.|