Which bus is bi-directional?

Which bus is bi-directional?

• A. Memory
• B. Address
• C. Control
• D. Data

Answer: (D)

The data bus is bi-directional because it is responsible for transferring actual data between the various components of a computer system. This means that it can carry data to and from the CPU, memory, and input/output devices. Since data needs to flow in both directions—in order to read data from memory or write data to memory, for example—the design of the data bus allows for this two-way communication. In contrast, the address bus is unidirectional; it only carries address information from the CPU to the memory or device that needs to be accessed. Similarly, while the control bus can manage signals between the CPU and other components, its function typically involves sending commands, status signals, or control information in one direction rather than facilitating data transfer back and forth. The memory bus, which often consists of both address and data buses, is likewise not inherently bi-directional in nature.

The data bus is bi-directional because it is responsible for transferring actual data between the various components of a computer system. This means that it can carry data to and from the CPU, memory, and input/output devices. Since data needs to flow in both directions—in order to read data from memory or write data to memory, for example—the design of the data bus allows for this two-way communication.

In contrast, the address bus is unidirectional; it only carries address information from the CPU to the memory or device that needs to be accessed. Similarly, while the control bus can manage signals between the CPU and other components, its function typically involves sending commands, status signals, or control information in one direction rather than facilitating data transfer back and forth. The memory bus, which often consists of both address and data buses, is likewise not inherently bi-directional in nature.