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

Determine the channel of common channel signalling in ss7, Common channel s...

Common channel signalling in SS7 is (A) out band control channel. (B) In band control channel. (C) Speech control channel. (D) None of the above. Ans:

If the system is not booting what can we do, First we must go to bios and s...

First we must go to bios and should check boot sequence,local add statusOr we should check RAM & check h.d.d cable. check cd writer for cd or dvd

Advantages of random scan display, Advantages of random scan display ...

Advantages of random scan display Early computer displays: basically an oscilloscope. Control X, Y with vertical/horizontal plate voltage. Often used intensity as

Parallel edge or self loop of the total number of edges, A graph with n ver...

A graph with n vertices will definitely have a parallel edge or self loop of the total number of edges are More than n(n-1)/2

Implementing recursive function the data structure, For executing recursive...

For executing recursive function the data structure used is: For executing recursive function, stack is used as a data structure.

Asymptotic notations, Asymptotic Notations These notations are used fo...

Asymptotic Notations These notations are used for evaluating functions. Assume we have two functions f(n) and g(n) defined on real numbers, Theta Notation Big Notation

Cloud computing assignment, In the module on WSDL you were presented with t...

In the module on WSDL you were presented with the details of the WSDL service that receives a request for a stock market quote and returns the quote. The basic structure of a WSDL

Why spc is used, SPC is used for (A) Carrying Exchange Control Functi...

SPC is used for (A) Carrying Exchange Control Functions (B) Carrying Subscriber Control Functions (C) Exchange Hardware (D) Signalling Purpose Ans:

State the hardware faults and softwate faults, State the hardware faults an...

State the hardware faults and softwate faults - protection against hardware faults could be to keep backups or use GFS; use of UPS (in case of power loss) and parallel system a

show bank type , Describe an abstract class 'Bank' having abstract methods...

Describe an abstract class 'Bank' having abstract methods as 'CreateAccount' 'depositAmount' & 'withDrawAmount'.Add method definitions for 'CalculateInterest' and 'SetInterest' as

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages