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

Concept of multithreading, Concept of Multithreading: These troubles incre...

Concept of Multithreading: These troubles increase in the design of large-scale multiprocessors such as MPP as discussed above. Thus, a solution for optimizing this latency should

Instruction set of risc, how to reduce risc pipelining structure

how to reduce risc pipelining structure

Callable modules of program code within one abap/4 program, How can we crea...

How can we create callable modules of program code within one ABAP/4 program? We can create callable modules by two techniques:- By defining Macros. By creating incl

What is block started by symbol, What is BSS(Block Started by Symbol)? ...

What is BSS(Block Started by Symbol)? A data showing at the machine level, that has initial values when a program begins and tells about how much space the kernel assigns for t

Central processing unit - computer architecture, Central processing unit (C...

Central processing unit (CPU) : The part of the computer which executes program instructions is known as the processor or central processing unit (CPU). CPU is over single ele

What is digital versatile disk, Digital versatile disk (DVD) This is an...

Digital versatile disk (DVD) This is an optical system for storing data. It's similar to CD though typically can hold 4.7 Gbyte of data compared to only 700 MB of data on a CD.

Why a computer expect to receive responses, Why a computer expect to receiv...

Why a computer expect to receive responses when it broadcast an ARP request? Response will be acquired only from the machine for that request is being sent not for the other ma

Explain in detail about register transfer language, We have multiple instan...

We have multiple instances in RTL (Register Transfer Language), do you do anything special during synthesis stage? Whereas writing RTL(Register Transfer language),say in Verilo

Prolog artificial intelligence , 1. countdown Example: countdown(5,[5,4,3,2...

1. countdown Example: countdown(5,[5,4,3,2,1]). NOTE - your function should be able to answer questions such as: ?- countdown(5,L). 2. count_occur Example: count_occur(7,[5,2,6

How is transaction processing system affected, How is Transaction Processin...

How is Transaction Processing System affect performance of e-commerce sites? Transaction Processing System influences performance of e-commerce sites: Transaction-Processing

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages