What is input-output processors, Computer Engineering

Assignment Help:

Q. What is Input-output processors?

let's briefly summarize the development in area of input/output functions. These can be briefed as below:

1. CPU directly controls a peripheral device.

2. Addition of I/O controller or I/O interface: CPU employs programmed I/O with no interrupts. CPU was separated from details of external I/O interfaces.

3. Contained use of I/O controllers however with interrupts: CPU need not spend time waiting for an I/O operation to be executed, increasing efficiency.

4. Direct access of I/O interface to memory through DMA: CPU involvement decreased to at beginning and at end of DMA operation.

5. CPU directs I/O processors to execute an I/O program in memory. I/O processor fetches as well as executes these instructions with no CPU intervention. This permits CPU to specify a series of I/O activities and to be interrupted only when complete sequence has been performed. With this architecture a large set of I/O devices can be managed with minimum CPU involvement.

With last two steps (4 and 5) a main change takes place with introduction of concept of an I/O interface capable of executing a program. For steps 5 the I/O interface is frequently referred to as an I/O processor and I/O channel.


Related Discussions:- What is input-output processors

Why is cloud computing important, Why is Cloud Computing important? The...

Why is Cloud Computing important? There are many implication of cloud technology, for both developers and end users. For developers, cloud computing gives increased amounts of

Enumerate data structures used during 1-pass of assembler, Enumerate the da...

Enumerate the data structures used during the first pass of the assembler. Indicate the fields of these data structures and their purpose/usage. Three main data structures used

What is dialog box, This is a small window that is demanding your attention...

This is a small window that is demanding your attention. You must respond before you can carry on using the program that shown the dialog box. A dialog box does not have a minimize

Basic elements of assembly language, Basic elements of  Assembly language:...

Basic elements of  Assembly language: Any Assembly language which consists 3 types of instruction statements that are used to define the program operations: Data secti

Digital logic, write a short note on the tri state ttl inverter

write a short note on the tri state ttl inverter

How can i make text in a cell display in multiple lines, When entering word...

When entering word into the cell, press Alt-Enter to insert a line break. When you do so, Excel will automatically give text wrapping to the cell. To reformat existing cells s

How many tables can an append structure be assigned, To how many tables can...

To how many tables can an append structure be assigned. One table can be assigned to append structure.

Discuss in detail the subscriber loop systems, Discuss in detail the subscr...

Discuss in detail the subscriber loop systems. Subscriber Loop System: Every subscriber in a telephone network is linked usually to the nearest switching office by means of w

What is middleware net dynamics, NetDynamics Application Server was the pri...

NetDynamics Application Server was the primary Java-based integrated software platform. The product was developed by NetDynamics Inc. As Java became the dominant development langua

What is concurrent control, What is concurrent control? Control resides...

What is concurrent control? Control resides concurrently in various independent objects, every a separate task. A task can wait for input but other task continues implementatio

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd