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 is home banking, Home Banking: E-commerce is used in Home Banking ...

Home Banking: E-commerce is used in Home Banking as single call or single click. Online banking (Internet banking) is a term used for performing transactions, payments etc. ove

Could tcp allow ip to checksum the data, Could TCP allow IP to checksum the...

Could TCP allow IP to checksum the data? TCP cannot permit IP to checksum data yet IP has its own checksum for its header. IP layer is fundamentally responsible for routing of

Principles for developing successful system, Q. Principles for developing s...

Q. Principles for developing successful system? (1) Both developers and customers must be involved for accuracy in the information. (2) A problem solving approach must be

Explain about the term e-brokerage briefly, Explain about the term E-broker...

Explain about the term E-brokerage briefly. An e-brokerage is an investment house which allows you to buy and sell stocks and acquire investment information through its Web sit

Binary tree can be converted in to its mirror image, A binary tree can be c...

A binary tree can be converted in to its mirror image By traversing it in Preorder

Disadvantages of pipeline - computer architecture, Disadvantages of pipelin...

Disadvantages of pipeline: Pipeline architecture has 2 major disadvantages. First is its complexity and second is the inability to constantly run the pipeline at full speed,

Build a tv remote control, Communication by devices, such as the HC11 proce...

Communication by devices, such as the HC11 processor, is a key and vital part of most systems that are used in military, commercial, and academic settings. In fact, most of these

Learning decision trees using id3 - artificial intelligence, L e arning D...

L e arning Decision Trees Using ID3 Sp eci f y i n g the Problem We now have to look at how you mentally created your decision tree when deciding what to do at

The concept of program-parallel computing, The Concept of Process Infor...

The Concept of Process Informally, a method is a program in execution, behind the program has been loaded in the main memory. However, a method is more than just a program code

Explain the storage class register, The Storage Class register The Sto...

The Storage Class register The Storage Class register : The storage class 'register' tells the compiler that the associated variable should be stored in high-speed memor

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages