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

Assignment, Find the Regular Grammar for the following Regular Expression: ...

Find the Regular Grammar for the following Regular Expression: a(a+b)*(ab*+ba*)b.

What is a match code, What is a Match Code? Match code is a tool to hel...

What is a Match Code? Match code is a tool to help us to find for data records in the system. Match Codes are an proficient and user-friendly search aid where key of a record i

How do you get workflow automation in e-business environment, How do you ge...

How do you get workflow automation into e-business environment? In order to run smoothly, organizations frequently standardize processes across the organization and support use

Performance of computer system, Performance of computer system: Comput...

Performance of computer system: Computer performance is frequently described in terms of clock speed (usually in MHz or GHz). It refers to the cycles per second of the main cl

Explain the significance ipv6 over ipv4, Explain the significance IPV6 over...

Explain the significance IPV6 over IPV4. The maximum size of an Ipv6 datagram is 65575 bytes, with the 0 bytes Ipv6 header. Ipv6 also describe a minimum reassembly buffer size:

Draw a diagram to illustrate the design pattern, Problem: (a) What show...

Problem: (a) What shows a Pattern a Pattern? (b) Which pattern is given below? Justify your answer. public class A { private static A instance = null; private A() {

Show the mailing lists on internet, Q. Show the Mailing lists on Internet? ...

Q. Show the Mailing lists on Internet? Another exciting aspect about E-mail is that you can find groups of people who share your interests-whether you are inclined toward games

Data structuer and algorihm, what is list stack queues

what is list stack queues

Algorithm to insert a key in b-tree, Algorithm to insert a key in B-tree is...

Algorithm to insert a key in B-tree is as follows: 1. First search is completed for the place where the new record must be put. As the keys are inserted, they are sorted into

Advanced microprocessor, Write a program to mask bits D3D2D1D0 and to set ...

Write a program to mask bits D3D2D1D0 and to set bits D5D4 and to invert bits D7D6 of the AX register.

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages