What is input - output instructions, Computer Engineering

Assignment Help:

Q. What is Input - Output Instructions?

An I/O instruction is stored in memory of computer and is fetched as well as executed by processor producing an I/O-related command for I/O interface. With programmed I/O there is a close correspondence between I/O-related instructions and I/O commands that processor concerns to an I/O interface to execute instructions.

In systems with programmed I/O, I/O interface and the main memory as well as processors generally share system bus. So every I/O interface must interpret address lines to decide if command is for itself. There are two ways for doing so. These are known as isolated I/O and memory-mapped I/O. 

With memory-mapped I/O there is single address space for I/O devices and memory locations. Processor treats status and data registers of I/O interface like memory locations and uses similar machine instructions to access both I/O devices and memory. For a memory-mapped I/O only a single write and a single read line are required for memory or I/O interface write or read operations. These lines are triggered by processor for either I/O device access or memory access. Figure below displays memory-mapped I/O system structure.


Related Discussions:- What is input - output instructions

Why we need number systems, Q. Why we need number systems? Number syste...

Q. Why we need number systems? Number system is used to signify information in quantitative form. Some of the general number systems are octal, decimal, hexadecimal and binary.

Explain about the history of magento?, Varien, the company that owns Magent...

Varien, the company that owns Magento, formerly worked with osCommerce. They originally planned to discontinue osCommerce but later decided to rewrite it as Magento. Magento formal

Write a program which collects in data samples, Write a program which colle...

Write a program which collects in data samples from a port at 1 ms interval. The upper 4 bits collected data same as mastered and stored in an array in successive locations. ; R

Explain about of unicode, Q. Explain about of Unicode? This is a newer ...

Q. Explain about of Unicode? This is a newer International standard for character representation. Unicode offers a unique code for each character irrespective of Program, platf

What is an i/o interface, What is an I/O Interface? Input-output interf...

What is an I/O Interface? Input-output interface provides a method for transferring binary information among internal storage, like memory and CPU registers, and external I/O d

The constructed datatype of c, The constructed datatype of C is known as ...

The constructed datatype of C is known as Structure is a constructed datatype of C.

Adding momentum - sigmoid units, Adding Momentum - Sigmoid units: Howe...

Adding Momentum - Sigmoid units: However imagine a ball rolling down a hill as it does so then it gains momentum in which its speed increases and it becomes more difficult to

What is sap locking, What is SAP locking? It is a mechanism for describ...

What is SAP locking? It is a mechanism for describing and applying logical locks to database objects.

Main strength of ascii, Q. Main strength of ASCII? One such standard co...

Q. Main strength of ASCII? One such standard code which enables language encoding that is popularly used is ASCII (American Standard Code for Information Interchange). This cod

Differentiate between transport & session layer of osi model, Differentiate...

Differentiate between Transport and Session layers of OSI model. OSI Model Transport Layer The transport layer utilizes the services provided through the network layer, as

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