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 is the purpose of reserved word using in c#, A keyword that states the...

A keyword that states the types in a particular namespace can be referred to without requiring their full qualified type names. 'using' reserved word always come with namespace

Define the node of object oriented modeling, Define the node of object orie...

Define the node of object oriented modeling A node is a physical element which exists at runtime and represents a computational resource usually having a large memory and often

Mac and llc, how can we improve the way LLC and MAC are used for LAN operat...

how can we improve the way LLC and MAC are used for LAN operation.?

Write the benefits of broadcast model approach, a. Determine the non-functi...

a. Determine the non-functional system requirements that might be chosen for an application for a particular style and structures? b. Write the benefits of broadcast model appro

Describe memory and memory unit, Q. Describe Memory and Memory unit? In...

Q. Describe Memory and Memory unit? Input devices can fetch instructions or data only sequentially though a program may or may not be executed sequentially because looping, jum

Forward chaining, Forward Chaining: Now we have suppose we have a set ...

Forward Chaining: Now we have suppose we have a set of axioms that we know are true statements about the world. Whether we set these to each be an initial state of the segoal

What is the purpose of cdata in an xml document, Question: (a) What is...

Question: (a) What is the purpose of CDATA in an XML document? Explain your answer using extract codes. (b) Consider the following definition for an address element:

State the difference between following, Q. State the difference between fo...

Q. State the difference between following. i. RAM and ROM ii. SRAM and DRAM iii. Dynamic and static MOS memories

What are event and its types, What are event and its types? An event is...

What are event and its types? An event is an occurrence at a point in time, like user depresses left button. Event happens instantaneously with regard to time scale. Type

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