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

Importance of spectrum to the mobile sector, (a) The statement "Standards ...

(a) The statement "Standards create markets or markets create standards" has been the subject of considerable debate. Discuss the advantages and disadvantages to having multiple

Statistical technique, Ask qa survey was conducted among the residents of p...

Ask qa survey was conducted among the residents of pune city,it suburbs and the pune cantonment area.the following three pie diagrams show their respective preferences for living i

Algebra, Discrete Mathematics - (A?B)-(AnB)=(A-B)?(B-A) - prove by cases?? ...

Discrete Mathematics - (A?B)-(AnB)=(A-B)?(B-A) - prove by cases?? State which law you have used at each step. I''ve just started learning this, this semester .. and i havnt quite

What is access latency and rotation speed, Q. What is Access latency and Ro...

Q. What is Access latency and Rotation Speed? Access latency: A disk access basically moves the arm to selected cylinder and waits for rotational latency that may take less t

How society is affected thorugh internet, How society is affected thorugh I...

How society is affected thorugh Internet Buying goods and services (for example banking) over the internet has both negative and positive aspects on society. These can be expl

Which is the slowest sorting procedure, The slowest sorting procedure is   ...

The slowest sorting procedure is    Bubble Sort is the slowest sorting process.

Differences between cisc and risc architectures, Question: a) What is ...

Question: a) What is the main difference between the Princeton and Harvard microprocessor architectures? b) State five main differences between CISC and RISC architectures?

Explain i/o buffer and advantage of buffering, What is an I/O buffer? What ...

What is an I/O buffer? What is the advantage of buffering? Is buffering always effective? Justify your answer with help of an example.   One type of I/O requirement arises from

Scope of expert system, The scope of the experts system is very limite...

The scope of the experts system is very limited. It cannot work outside the field it is being used. The users knowledge is required to adjust to new situation. To reduce

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