NIMCET 2024 — Computer PYQ

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Question

NIMCET 2024 — Computer PYQ

NIMCET | Computer | 2024

Which of the following components is used to establish a communiation link between a CPU and the peripheral devices to transfer data?

Choose the correct answer:

Explanation

The Memory Data Register (MDR), also known as the Memory Buffer Register (MBR), is a critical component of the CPU's register set. It acts as a temporary holding area for data.

Function: When data is transferred between the CPU and external components (like memory or peripheral devices), it must pass through this register.
Mechanism:
- For a Read operation: Data from the external source is placed into the MDR before the CPU processes it.
- For a Write operation: The CPU places data into the MDR to be sent to the external device or memory address.

The relationship between the data bus and the register can be represented as:

\text{Data Transfer} \iff \text{MDR} \iff \text{Internal CPU Bus}

While the I/O Interface manages the protocol and connection logic, the MDR is the specific hardware register used to "establish the link" at the data level during the actual transfer process.

Final Answer:

The correct option is (C) Memory Data Register.