Io devices and i/o subsystem and direct memory access, Computer Engineering

Assignment Help:

Why IO devices cannot be connected directly to the system bus?

Ans: The IO devices can't be directly connected to the system bus because the following reason

A) The data transfer rate of IO devices is slower that of CPU.

B) The IO devices in computer system has different data formats and work lengths that of CPU. So it is essential to use a module between system bus and IO device which is called IO module or IO system

Write the factors considered in designing an I/O subsystem?

Ans:

1. Data transfer: Amount, rate to or from device.

2. Data Location: Device selection, address of data within device (track, sector etc)

3. Memory or between an I/O device and CPU.

4. Synchronization: Output only when device is ready, input only when

Described Direct Memory Access

Ans: A modest increase in hardware enables an IO device to transfer a block of information to /from memory without CPU intervention. This task needs the IO device to produce memory addresses and transfer data via the bus by using interface controllers.

Related Discussions:- Io devices and i/o subsystem and direct memory access

Decode the code, how to write mobile keypad program in c++

how to write mobile keypad program in c++

Definition of decision support system, Q. Definition of Decision support sy...

Q. Definition of Decision support system? Definition of DSS: A decision support system is a specific kind of information system which is an interactive system that supports in

How do we save a selected sub-image to a file in gimp, Use "Edit->Paste As-...

Use "Edit->Paste As->New Image" menu command or press Ctrl-Shift-V key combination, then save newly created image.The script-fu-selection-to image can also be used to cut a selecti

Explain form and input tag, Q. Explain FORM and INPUT Tag? A good way t...

Q. Explain FORM and INPUT Tag? A good way to learn about forms is to make use your notepad editor and make a new HTML document. Save it as form1.htm in some folder somewhere. Y

Computer based accounting systems, For the purposes of this assignment, you...

For the purposes of this assignment, you are the accountant for an industrial property development company, Devprop Leasing Co., that typically develops warehouse and industrial co

By which digits are represented, In a DTMF phone, digits are represented by...

In a DTMF phone, digits are represented by: (A) Orthogonal frequencies. (B) Orthogonal Phases. (C) Orthogonal codes. (D) Orthogonal pulses. Ans: Di

Illustrate about first generation computers, Q. Illustrate about First Gene...

Q. Illustrate about First Generation Computers? It is certainly ironic that scientific inventions of great impact have frequently been linked with supporting a very sad as well

Secret-key encryption, Secret-key encryption is also called as Private ...

Secret-key encryption is also called as Private encryption.

What are the special features of direct rdram, What are the special feature...

What are the special features of Direct RDRAM? It is a two channel Rambus It has 18 data lines intended to transfer two bytes of data at a time There are no divide

A variable number of input arguments, Write a function that will get a vari...

Write a function that will get a variable number of input arguments: the length and width of a rectangle, and possibly also the height of a box that has this rectangle as its base.

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages