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

Explain shared memory system and tightly coupled system, Shared Memory Syst...

Shared Memory System / Tightly Coupled System Shared memory multiprocessors have the subsequent features: For real-time high-speed processing these systems are preferabl

What is a heap dump, Thread Dump: When we trigger a thread dump on an appli...

Thread Dump: When we trigger a thread dump on an application server, all active thread informations will be deserted into file which is called as thread dump. Here, we can get info

Illustarte basic flip-flops, Q. Illustarte Basic Flip-flops? Let's firs...

Q. Illustarte Basic Flip-flops? Let's first see a ordinary latch. A latch or flip-flop can be created employing two NOR or NAND gates. Figure (a) presents logic diagram for S-R

Is it possible to create graph form spreadsheets, Is it possible to create ...

Is it possible to create graph form spreadsheets For example IF G5 > 100 THEN "Y" ELSE "N" - It's also possible to create graphs and charts from spreadsheets (such as using

Array user interface, You were offered bonus marks for separating the user ...

You were offered bonus marks for separating the user interface code from the main logic of your program. This design choice makes it very easy to replace the user interface without

Concept of temporal parallelism, Concept of Temporal Parallelism In ord...

Concept of Temporal Parallelism In order to describe what is meant by parallelism inherent in the answer of a problem, let us talk about an example of submission of electricity

How many two-input AND and OR gates are required to realize , How many two-...

How many two-input AND and OR gates are required to realize Y=CD+EF+G ? Ans. Y=CD+EF+G No. of two i/p AND gates=2 No. of two i/p OR gates = 2 One OR gate to OR CD and EF

What is artificial intelligence recognition, There are two goals to AI; the...

There are two goals to AI; the major one is to produce an artificial system that is about as good as or good than a human being at dealing with the actual world. The second goal is

Determine the uses of memory blocks, Determine the Uses of memory blocks. ...

Determine the Uses of memory blocks. Not as common a technique though something to consider. As Verilog has a very convenient syntax for declaring and loading memories, you ca

Explain the basic architecture of digital switching systems, Explain the ba...

Explain the basic architecture of digital switching systems. An easy N X N time division space switch is demonstrated in figure. The switch can be shown in an equivalence for

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages