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

Two ways of constructing a larger module to mount flash chip, What are the ...

What are the two ways of constructing a larger module to mount flash chips on a small card? The two ways are:- a) Flash cards b) Flash drivers.

Effective branching rate - heuristic searches, Effective Branching Rate: ...

Effective Branching Rate: Assessing heuristic functions is an important part of "AI" research: a particular heuristic function may sound such a good idea, but in practice give

What is referred as memory mapped i/o, What is referred as memory mapped I/...

What is referred as memory mapped I/O. The case in computers that employ only set of read and write signals and do not differentiate between memory and I/O address. This is kno

Functions employed for messaging passing, Q. Functions employed for messagi...

Q. Functions employed for messaging passing? The functions employed for messaging passing are: int MPI_Send(void *msgaddr, int count, MPI_Datatype datatype, int dest, int ta

Write a short note on pointer declaration, Write a short note on pointer de...

Write a short note on pointer declaration A simple variable in a program is stored in a certain number of bytes at a particular memory location, or address, in the machine. Poi

What is artificial intelligence fuzzy logic, Fuzzy logic is a form of vario...

Fuzzy logic is a form of various-valued logic; it deals with reasoning that is approximate rather than fixed & exact. In contrast with traditional logic theory, where binary sets h

Define device interface, Define device interface. The buffer registers ...

Define device interface. The buffer registers DATAIN and DATAOUT and the status flags SIN and SOUT are part of circuitry commonly called as a device interface.

Explain sr latch with nand gate, Explain SR Latch with NAND Gate? SR La...

Explain SR Latch with NAND Gate? SR Latch has two useful states: Set state, when output Q=1 and Q'=0. Reset state, when output Q=0 and Q'=1.Output Qand Q' are normally

Implement or, Q. Write a program to implement OR, NOR, AND and NAND gates ...

Q. Write a program to implement OR, NOR, AND and NAND gates using and without using Bit wise operator. The menu should be as follows: I. Using Bit Wise operator II. Withou

#title.un ba lance out put differential amplitude, #questi on.. How it wor...

#questi on.. How it works explain

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages