Interrupt - driven input-output, Computer Engineering

Assignment Help:

Q. Interrupt - Driven Input-output?

Problem with programmed I/O is that processor has to wait a long time for I/O interface to see whether a device is free or waits until completion of I/O. Result is that the performance of processor goes down extremely. What is the solution? What about processor going back to do other useful work without waiting for I/O device to finish or get freed up? However how will processor be intimated about completion of I/O or a device is ready for I/O? A well-organized mechanism was considered for this which is referred to as interrupt-driven I/O. In this mechanism provision of interruption of processor work once device has completed I/O or when it's ready for I/O has been provided.

Interrupt-driven I/O mechanism for transferring a block of data is displayed in Figure 5(b). Please note after issuing a read command (for input) CPU goes off to do some other useful work whereas I/O interface proceeds to read data from connected device. On completion of an instruction cycle CPU checks for interrupts (that will happen when data is in data register of I/O interface and it now requires CPU's attention). Now CPU saves important register and processor status of executing program in a stack and requests I/O device to provide its data that is placed on data bus by I/O device. After taking needed action with data CPU can go back to program it was executing before interrupt.


Related Discussions:- Interrupt - driven input-output

Cohesion and coupling, can i get a prepared ppt for this topic to present i...

can i get a prepared ppt for this topic to present it in a seminar??

Processors hypercube and utilisation displays, Processors Hypercube Thi...

Processors Hypercube This is specific to in the hypercube: Here, every processor is depicted by the set of nodes of the graph and the several arcs are represented with communic

Handling a page in memory - computer architecture, Handling a Page: ...

Handling a Page: Typical page size today are 4 kb to 16 kb ,having tendency to use even larger page sized Organization that reduce the page fault rate are striking (comp

Explain about cathode ray tubes, Q. Explain about Cathode Ray Tubes? Ca...

Q. Explain about Cathode Ray Tubes? Cathode ray tube is the major technology on that televisions and monitors have been based.  CRT is a partially evacuated glass tube which is

How different are interface and abstract class in .net, How different are i...

How different are interface and abstract class in .Net? Abstract classes cannot be instantiated it can have or can't have abstract method basically known as must inherit as th

How do active web pages work, How do active web pages work? Describe with a...

How do active web pages work? Describe with a small example. Active Web Pages: An active document is not completely specified through the server. Instead an active documen

Build and explain a prototype model-uml, International Coal Coal-fire...

International Coal Coal-fired Power Generation Compared with other fossil fuels, burning coal produces relatively large amounts of atmospheric pollutants: carbon dioxide

What is a deadlock, What is a Deadlock? Deadlock is a situation, in th...

What is a Deadlock? Deadlock is a situation, in that processes never complete executing and system resources are tied-up, preventing another job form starting. If the resou

The max number of calling modes stacked at one time is, The max number of ...

The max number of calling modes stacked at one time is? NINE

Explain the working of any one of centralized spc, Explain the working of a...

Explain the working of any one of centralized SPC? Standby mode of operation is the easiest of dual processor configuration operations. Usually, one processor is active and

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