The DMA mode of data transfer reduces CPU’s overhead in handling I/O operations. It also allows parallelism in CPU and I/O operations. Such parallelism is necessary to avoid wastage of valuable CPU time while handling I/O devices whose speeds are much slower as compared to CPU. The concept of DMA operation can be extended to relieve the CPU further from getting involved with the execution of I/O operations. This gives rises to the development of special purpose processor called Input-Output Processor (IOP) or IO channel.
The Input Output Processor (IOP) is just like a CPU that handles the details of I/O operations. It is more equipped with facilities than those are available in typical DMA controller. The IOP can fetch and execute its own instructions that are specifically designed to characterize I/O transfers. In addition to the I/O – related tasks, it can perform other processing tasks like arithmetic, logic, branching and code translation. The main memory unit takes the pivotal role. It communicates with processor by the means of DMA.
The block diagram –
The Input Output Processor is a specialized processor which loads and stores data into memory along with the execution of I/O instructions. It acts as an interface between system and devices. It involves a sequence of events to executing I/O operations and then store the results into the memory.
- The I/O devices can directly access the main memory without the intervention by the processor in I/O processor based systems.
- It is used to address the problems that are arises in Direct memory access method.
Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.
- Cache Organization | Set 1 (Introduction)
- Introduction to quantum computing
- Introduction of Stack based CPU Organization
- Introduction of Microprocessor
- Introduction of Secondary Memory
- Introduction of Single Accumulator based CPU organization
- Difference between RISC and CISC processor | Set 2
- Introduction of General Register based CPU Organization
- Vector processor classification
- Introduction to memory and memory units
- Introduction of Control Unit and its Design
- Introduction of Ports in Computers
- Introduction to solid-state drive (SSD)
- Introduction to Parallel Computing
- Introduction of ALU and Data Path
- Introduction of Microcomputer System
- Introduction of Multiprocessor and Multicomputer
- Introduction of Assembler
- Macro Processor
- Operation of SIMD Array Processor
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.