Centralised Bus Arbitration Approach

Centralised Bus Arbitration Approach is a type of bus arbitration technique in which the involvement of the processor is required to arbitrate the bus. In this approach, a single device known as the bus controller or arbiter is responsible for managing the bus access requests from several devices connected to the bus.

Working of Centralised Bus Arbitration Approach:

The working of Centralised Bus Arbitration Approach can be explained with the following steps:

1. When a device wants to access the bus, it sends a request to the bus controller.

2. The bus controller receives the request and grants access to the bus to the requesting device.

3. The requesting device can now transfer data over the bus.

4. Once the data transfer is complete, the requesting device releases the bus and waits for its turn to access the bus again.

Advantages of Centralised Bus Arbitration Approach:

1. It is a simple and easy-to-implement approach.

2. It provides fair access to the bus for all devices connected to it.

3. It ensures that only one device accesses the bus at a time, thus avoiding data collisions.

Disadvantages of Centralised Bus Arbitration Approach:

1. It can become a bottleneck in systems with a large number of devices connected to the bus.

2. It can lead to increased latency and reduced performance.

3. It can be a single point of failure in the system.

Conclusion:

Centralised Bus Arbitration Approach is a widely used bus arbitration technique in computer systems. It is simple, reliable and ensures fair access to the bus by all devices connected to it. However, it can become a bottleneck in systems with a large number of devices and can also be a single point of failure in the system.