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

Explain the benefits of interpreter, Explain the Benefits of Interpreter? ...

Explain the Benefits of Interpreter? The benefit of an interpreter though is that it doesn't need to go through the compilation stage during which machine instructions are gene

Explain how a node can be inserted into an avl tree, Explain how a node can...

Explain how a node can be inserted into an AVL tree. We can insert a node into an AVL tree through the insertion algorithm for binary search trees in which we compare the key o

Explain naming convention verification points, Explanation:- In functio...

Explanation:- In functional testing, you require to confirm that the objects in the application-under-test look and work as designed from build to build. To accomplish this, yo

Explain about the public key cryptography, Explain about the Public Key Cry...

Explain about the Public Key Cryptography. Public Key Cryptography: It is a cryptographic system which uses two keys as a public key identified to everyone and a private

Flynns categorization, Normal 0 false false false EN-US...

Normal 0 false false false EN-US X-NONE X-NONE

Mention the two subsystem relationship, Mention the two subsystem relations...

Mention the two subsystem relationship. The relationship among two subsystems can be: Client-server Peer-peer

How do you create a permanent cookie, How do you create a permanent cookie?...

How do you create a permanent cookie?  By setting the expiry date of the cookie to a later on time (like 10 years later.)

Amdahl law to measure speed up performance, Q. Amdahl Law to measure speed ...

Q. Amdahl Law to measure speed up performance? Remember that speed up factor assists us in knowing relative gain attained in shifting execution of a task from sequential comput

Determine the benefits of mainframe computers, Determine the benefits of ma...

Determine the benefits of mainframe computers Government agencies, large businesses, and universities usually use this type of computer. So: This computer is common t

Explain resource dependence, Resource Dependence The parallelism betwee...

Resource Dependence The parallelism between instructions can also be affected because of the shared resources. If two instructions are occupying the same shared resource then i

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