Thread Rating:
  • 21 Vote(s) - 2.86 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Modes of Data Transfer in Computer PPT
#1

Modes of Data Transfer in Computer


[37172]

[37173]

Introduction

Binary information received from an external device is usually stored in memory.
Information transferred from the central computer into an external device also is originally from the memory.
Data transfer between the central computer and input and output devices may be handled in a variety of modes

Programmed I/O

These operations are a results of I/O instructions written in the computer program. Data transfer is initiated by an instruction in the program.
Usually the data transfer data between CPU register and peripheral device. Other instructions are used to transfer data transfer data between CPU and memory.
The peripheral has to be constantly monitored. Once a data transfer is initiated, the CPU is required to monitor the interface to see when a transfer can again be made.

Applications of programmed I/O method

Useful in small low speed computers.
Used in systems that are dedicated to monitor a device continuously.
Used in the data register.
Used to check the status of the flag bit and branch.

Interrupt initiated I/O

This can be avoided by using an interrupt facility and special commands to inform the interface to issue an interrupt request signal when the data are available from the device.
Meanwhile, CPU can proceed to execute another program. The interfaces keeps monitoring the device.
When the interface determines that the device is ready for data transfer, it generates an interrupt request to the computer.

Direct Memory Access (DMA)

The interface transfer data into and out of the memory unit through the memory bus.
The CPU initiates the transfer of supplying the interface with the starting address and the number of words needed to be transferred and then proceed to execute other tasks.
When the request is granted by the memory controller, the DMA transfer the data directly into memory. The CPU delays its memory access operation to allow the direct memory I/O transfer.

I/O Processor

CPU is the master while the IOP is a slave processor. The CPU performs the tasks of initiating all operations.
The operations include
Starting an I/O transfer
Testing I/O status conditions needed for making decisions on various I/O activites.
Reply

Search Cloud: powerpoint presentation modes of data transfer in computer, modes of data transfer in computer ppt, modes of data transfer ppt slides, modes of data transfer ppt, ppt for project on data transfer in computer, modes of data transfer in computer, modes of transfer ppt, iop modes of transfer ppt, data transfer in computer ppt,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  REPORT ON FINGER TRACKING IN REAL-TIME HUMAN COMPUTER INTERACTION engineering project helper 1 1,047 23-01-2015, 07:16 AM
Last Post: Guest
  3D-OPTICAL DATA STORAGE TECHNOLOGY computer science crazy 7 6,770 07-01-2015, 05:57 AM
Last Post: hannu heena
  Data Transmission Using Multi-Tasking-Sockets academic expert 4 2,876 15-10-2014, 08:03 PM
Last Post: Guest
  Fuzzy Keyword Search over Encrypted Data in Cloud Computing project maker 3 1,286 10-07-2014, 10:44 PM
Last Post: askguru100
  COMPUTER SCIENCE ENGINEERING (C.S.E) SEMINAR TOPICS navasspecials 0 619 21-03-2014, 04:37 PM
Last Post: navasspecials
Music Computer Science Seminar Abstract And Report computer science crazy 3 9,411 19-03-2014, 09:00 AM
Last Post: MichaelLona
  3D Visualization In Computer Graphics Download Seminar Report and Paper Presentation computer science crazy 3 4,944 11-03-2014, 01:36 AM
Last Post: suma v v
  2013 Latest Computer Science Seminar Topics, MCA Seminar Topics computer science crazy 2 2,044 19-02-2014, 03:31 AM
Last Post: Guest
  PARALLEL COMPUTING IN REMOTE SENSING DATA PROCESSING seminar projects expert 3 2,856 12-02-2014, 02:11 AM
Last Post: bhargavigoly12@gmail.com
  Parallel Computing In Remote Sensing Data Processing computer science crazy 6 4,747 12-02-2014, 02:00 AM
Last Post: bhargavigoly12@gmail.com



Users browsing this thread: 1 Guest(s)