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

Block-level distributed parity, Given a RAID 5 (block-level distributed par...

Given a RAID 5 (block-level distributed parity) with k disks, how well will large block trnsmitted work? How well will it handle a high I/O request rate? Evaluate the performance t

What about division and multiply operations, Q. What about division and mul...

Q. What about division and multiply operations? In most of the older computers divisions and multiply were implemented using subtract/add and shift micro-operations. If a digit

Instruction set architecture - assembly language, Instruction Set Architect...

Instruction Set Architecture (ISA): The Instruction Set Architecture (ISA) is the part of the processor which is noticeable to the compiler writer or programmer. The ISA serve

Michelsons interferometer, Problems on michelsons interferométer

Problems on michelsons interferométer

Interrupt handling - computer architecture, Interrupt handling: Handlin...

Interrupt handling: Handling Interrupts Several situations where the processor should avoid interrupt requests Interrupt-enable Interrupt-disable Typical

Dynamic programming, The first task will involve doing a little background...

The first task will involve doing a little background reading on Dynamic Programming to get up to speed. The second task is to write the code: Search Space Write a function whi

What is called static and dynamic branch prediction, What is called static ...

What is called static and dynamic branch prediction? The branch prediction decision is always the similar every time a given instruction is implemented. Any approach that has t

Multithreaded architecture, Multithreaded Architecture: It is clear now th...

Multithreaded Architecture: It is clear now that if we give many contexts to multiple threads, then processors with multiple contexts are known as multithreaded systems. These sys

What are addressing modes, What are Addressing Modes Many of instructio...

What are Addressing Modes Many of instructions that a computer actually executes during running of a program concern movement of data to and from memory. It is not possible sim

Can we delete a domain, Can you delete a domain, which is being used by dat...

Can you delete a domain, which is being used by data elements? No.

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages