DMA transfer initiation

DMA stands for Direct Memory Access. It is a method of data transfer that allows data to be transferred between an I/O device and memory without the involvement of the processor. The DMA transfer is initiated by I/O devices.

Explanation

When an I/O device needs to transfer data to or from memory, it sends a request to the DMA controller. The DMA controller then takes over the bus and transfers the data directly between the I/O device and memory without the involvement of the processor. This frees up the processor to perform other tasks while the data transfer is taking place.

Advantages of DMA transfer

- High-speed data transfer: DMA transfer is faster than programmed I/O transfer because it does not involve the processor.
- Reduced processor overhead: DMA transfer reduces the load on the processor, allowing it to perform other tasks while data transfer is taking place.
- Efficient data transfer: DMA transfer is more efficient than programmed I/O transfer because it allows data to be transferred in blocks rather than one byte at a time.

Conclusion

In conclusion, the DMA transfer is initiated by I/O devices. DMA transfer is an efficient method of data transfer that allows data to be transferred between an I/O device and memory without the involvement of the processor. This results in high-speed data transfer and reduced processor overhead.