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 preprocessor directives, What are preprocessor directives? Pre...

What are preprocessor directives? Preprocessor directives: These are the commands given to a program called as pre-processor that processes the source code before it passes by

Discuss about constrained-random verification methodology, Discuss about Co...

Discuss about Constrained-Random Verification Methodology Advent  of  constrained-random  verification  gives  verification  engineers  an  effective  method  to achieve covera

What is a pointer, What is a pointer? The register or memory location t...

What is a pointer? The register or memory location that having the address of an operand is known as a pointer.

What is assembly, What is assembly Assemblies are the building blocks o...

What is assembly Assemblies are the building blocks of .NET Framework applications; they variety the fundamental unit of deployment, version control, reuse, activation scoping,

What are the advantages of interviewing, What are the Advantages of Intervi...

What are the Advantages of Interviewing - Opportunity to motivate interviewee to give open and free answers to analyst's questions    -  allows analyst to probe for more f

Operator, write algorithm and draw flowchart for exchange the values of two...

write algorithm and draw flowchart for exchange the values of two variables.

Explain dns, DNS is The horizontal naming system.

DNS is The horizontal naming system.

Classification according to pipeline configuration, Classification accordin...

Classification according to pipeline configuration: According to the configuration of a pipeline, the following parts are recognized under this classification: Unifunct

Explain the resources of an operating system, Explain the resources of da...

Explain the resources of data structure is used by an operating system to keep track of process information? Explain A process is a program in execution. An operating system

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