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

The need of parallel computation, The Need Of Parallel Computation With...

The Need Of Parallel Computation With the advancement of computer science (CS), computational speed of the processors has also improved many a time. Moreover, there is certain

Name the numerous household devices, Name the Numerous household devices ...

Name the Numerous household devices Numerous household devices now use microprocessors to control their different functions. The following is just a sample of common devices (d

What is parsing in grammatical structure, What is Parsing? Parsing: ...

What is Parsing? Parsing: It is the process of analyzing a text, made of an order of tokens, to find out its grammatical structure regarding a given formal grammar. Parsing

Explain working of direct memory access, Q. Explain working of Direct Memor...

Q. Explain working of Direct Memory Access? In both programmed I/O and interrupt-driven processor is busy with executing input/output instructions and I/O transfer rate is limi

Determine about the web authoring tools, Web authoring tools CGI was cons...

Web authoring tools CGI was considered excellent in the beginning since it was also open standard. The only drawback it suffered was that it was slow. Major software developers v

What happens to logic after synthesis, What happens to logic after synthesi...

What happens to logic after synthesis, which is driving an unconnected output port that is left open (, that is, noconnect) during its module instantiation? An unconnected out

Write an awk program - unix , Write an AWK program which takes the followin...

Write an AWK program which takes the following input file and processes it. $cat data.txt John Do 111-1111 English 90 Maths 80 Alice Do 222-2222 English 90 Maths 90 Chemistry 93

What do you mean by data warehousing, What do you mean by data warehousing?...

What do you mean by data warehousing? Data warehouse implies as: a) It is subject oriented b) It is integrated and c) It is time variant d) It is non-volatile colle

What are the features of ado.net, What are the features of ADO.Net ? A...

What are the features of ADO.Net ? ADO.NET features: 1. Disconnected Data Architecture 2. Data cached in Datasets 3. Data transfer in XML format 4. Interaction wit

What is booting, What is booting? When the power is turned on, the OS h...

What is booting? When the power is turned on, the OS has to be loaded into the main memory which is taken place as part of a process known as booting. To initiate booting a tin

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages