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

What are the different between hypertext hypermedia, What are the different...

What are the different between hypertext hypermedia? Hypertext is fundamentally the same like regular text; this can be stored, read or searched and edited along with a signifi

Explain a multiprocessing operating system, Explain a multiprocessing opera...

Explain a multiprocessing operating system? A multiprocessing system is a computer hardware configuration which contains more than one independent processing unit. Multiprocess

Software interface, what is software interface #Minimum 100 words accepted...

what is software interface #Minimum 100 words accepted#

Write shorts notes on digital signature, Write shorts notes on Digital Si...

Write shorts notes on Digital Signature. This method is used to authenticate the sender of a message. For sign a message, the sender encrypts the message by using a key ident

Illustrate domain name system, Q. Illustrate Domain Name System? Domain...

Q. Illustrate Domain Name System? Domain name is a name which is given to a network for ease of reference. Domain refers to a group of computers which are known by a single com

Why is TCP called end-to-end protocol, Why is TCP called end-to-end protoco...

Why is TCP called end-to-end protocol? TCP is termed as an end-to-end protocol as this provides a connection directly by an application in one computer to an application on a r

Role of internet, Role of Internet, Intranet and extranet in e-business ...

Role of Internet, Intranet and extranet in e-business The following information activities are carried out in many business: 1.  Selling of raw materials 2.  Advertising o

Compare a decoder and a demultiplexer with block diagram, Compare a decoder...

Compare a decoder and a demultiplexer with suitable block diagrams. Ans. Demultiplexer has similar circuit as decoder but here e is obtained as the particular input line, the

Name the software required to run video conferencing, Name The software req...

Name The software required to run video conferencing The software and hardware required to run video conferencing is very sophisticated. Apart from obvious items (that is large

What is processor time of a program, What is processor time of a program? ...

What is processor time of a program? The periods during which the processor is active is known as processor time of a program it depends on the hardware included in the executi

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