What is input-output processors, Computer Engineering

Assignment Help:

Q. What is Input-output processors?

let's briefly summarize the development in area of input/output functions. These can be briefed as below:

1. CPU directly controls a peripheral device.

2. Addition of I/O controller or I/O interface: CPU employs programmed I/O with no interrupts. CPU was separated from details of external I/O interfaces.

3. Contained use of I/O controllers however with interrupts: CPU need not spend time waiting for an I/O operation to be executed, increasing efficiency.

4. Direct access of I/O interface to memory through DMA: CPU involvement decreased to at beginning and at end of DMA operation.

5. CPU directs I/O processors to execute an I/O program in memory. I/O processor fetches as well as executes these instructions with no CPU intervention. This permits CPU to specify a series of I/O activities and to be interrupted only when complete sequence has been performed. With this architecture a large set of I/O devices can be managed with minimum CPU involvement.

With last two steps (4 and 5) a main change takes place with introduction of concept of an I/O interface capable of executing a program. For steps 5 the I/O interface is frequently referred to as an I/O processor and I/O channel.


Related Discussions:- What is input-output processors

Call the user methods by creating the object, Make a class library and desc...

Make a class library and describe class 'User'. In User class describe the public, protected and Friend functions. Make a console application andadd a reference to this library and

What is the session, What is the session.  Session is a collection of v...

What is the session.  Session is a collection of various groups of method. Every session is assigned to a single control terminal. This terminal is either a pseudo-device. or a

What is delayed branching, What is delayed branching? A method called d...

What is delayed branching? A method called delayed branching can minimize the penalty incurred as a result of conditional branch instructions. The idea is easy. The instruction

Convert the following from octal to binary, Q. Convert the following from o...

Q. Convert the following from octal to binary, decimal, hexadecimal and BCD. a) 7.7 b) 4037 c) 23.34

Where protocol operates to monitor and control n/w devices, Protocol used t...

Protocol used to monitor and control network devices operates at? Protocol operates at application layer to monitor and control network devices operates.

Define protocol, Define Protocol. It is a set of rules that are followe...

Define Protocol. It is a set of rules that are followed by interconnecting computers and terminals to make sure the orderly transfer of information

Differentiate between absolute and relative poverty, Question 1: Using ...

Question 1: Using appropriate diagrams, describe the optimal provision of a private good and a public good. Question 2: Using appropriate diagram, show how there is an

Explain the concept of thread, The Concept of Thread A thread is a sequ...

The Concept of Thread A thread is a sequential flow of control within a process. A process is able to have one or more threads. Threads have their own register-values and progr

Explain transport layer of osi model, Explain Transport Layer of OSI Mode...

Explain Transport Layer of OSI Model. The transport layer utilizes the services provided through the network layer, as best path selection and logical addressing, to give end

Write a subroutine in c which toggles the cursor, Q . Write a subroutine in...

Q . Write a subroutine in C which toggles the cursor? Write a subroutine in C which toggles the cursor. It takes one argument which toggles the value between on (1) and off (0)

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