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

What are the features common in most of the websites, What are the features...

What are the features common in most of the websites Following general features must be found on most web sites in one form or another (this list is by no means exhaustive):

Determine the hardware for multiplication, Determine the hardware for multi...

Determine the hardware for multiplication The hardware for multiplication consists of equipment given in Figure. The multiplier is stored in register and its sign in Q . The se

Greedy search - artificial intelligence, Greedy Search - artificial intelli...

Greedy Search - artificial intelligence: If we have a heuristic function for states, defined as above, so we can simply measure each state with respect to this measure and ord

Multiple valued logics, Multiple valued logics: Multiple valued logics...

Multiple valued logics: Multiple valued logics, where altered types of truth value such as "unknown" are may be allowed. These have some of the particular advantages of fuzzy

Show the classification of networks, There are various approaches to the cl...

There are various approaches to the classification of Computer Networks. One such classification is based on distance approach. Networks can be classified into LAN, WAN and MAN net

What is a parent class of all java classes, Parent class of all Java classe...

Parent class of all Java classes is? All Java class's parent class is java. lang.object.

Explain about common addressing modes, Q. Explain about common addressing m...

Q. Explain about common addressing modes? Most of machines use a set of addressing modes. The following tree displays common addressing modes: Figure: Common Addres

Arduino Bingo Project., Hello everybody I have a project that is a bingo bo...

Hello everybody I have a project that is a bingo board run by laser pointers, light sensors, and leds. Basically I''m creating a 5 by 5 grid (bingo board) in which each row and col

Name the widely used language processor development tool, Name the widely u...

Name the widely used Language Processor Development Tools ( LPDTs). Widely used Language processor development tools are: Lex - A Lexical Analyzer Generator Lex assi

Layout for the assumed penalty, Solve the following 8-department problem us...

Solve the following 8-department problem using the MIP method. What is the resulting layout and flow-distance score? Note that the aspect ratio of each department should be 2.

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages