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

Explain the virtual memory, What is virtual memory?  Virtual memory is ...

What is virtual memory?  Virtual memory is a technique that permits the execution of processes that may not be completely in memory. It is the separation of user logical memory

Draw the logic diagram of 4-bit odd parity checkers, Normal 0 f...

Normal 0 false false false EN-IN X-NONE X-NONE

Describe about the layered computer design, Describe about the Layered comp...

Describe about the Layered computer design Introduction Layered computer design focuses on computer design. It uses top-down, layered approach to design and also to improve

Explain post office protocol, Explain POP (Post Office Protocol). The P...

Explain POP (Post Office Protocol). The Post Office Protocol gives remote access to an electronic mail box. The protocol permits a user's mailbox to reside on a computer which

Explain Not recently used page replacement algorithm, Not Recently Used Pag...

Not Recently Used Page Replacement Algorithm The not recently used abbreviated as NRU page replacement algorithm works on the subsequent principle: while a page is referenced,

Directory of the distribution, I tried to run two of the applets in the exa...

I tried to run two of the applets in the examples directory of the distribution?    Ans) I tried to run two of the applets in the example directory of the distribution. I instal

Tag do you use to add a hyperlink column to the DataGrid, What tag do you u...

What tag do you use to add a hyperlink column to the DataGrid?   Anchor tag is used to add a hyperlink column to the data grid

Dbms, aggregation in dbms?

aggregation in dbms?

Which error detecting method detect more errors, Error detecting method tha...

Error detecting method that can detect more errors without increasing additional information in each packet is? Error detecting method which can detect more errors without rais

How wap gateway works, How WAP Gateway works? An significant feature of...

How WAP Gateway works? An significant feature of WAP is the maintain of telephony service integrated with micro browsing of data. aveAccess WAP Gateway functionss as a

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