Input output interface-microprocessor, Assembly Language

Assignment Help:

I/O interface

I/O  devices such as displays and keyboards  establish  communication of computer with outside world. Devices may be interfaced in 2 ways Memory mapped I/O and I/O MAPPED I/O. In I/O mapped I/O, device is recognized with a unique device number and data are transferred thru IN/OUT instruction. Memory mapped I/O each device is recognize with 16 bit address. I/O devices are considered as a part of memory related instruction and memory is used for data transfer.

An I/O interface might be able to

o    To Determine whether or not it is being interfaced

o   To Determine whether it has to send data to CPU or receive data from CPU

o   For Send ready signal informing CPU that transfer is over

o   For Send interrupt Requests to CPU and receive interrupt acknowledgement and send an interrupt type.

An Interface may be divided into 2 parts and a. A part that interfaces to the system bus  and a part that interfaces to the I/O device. There might be receivers  and drivers to maintain signal quality, logic for translating the interface control signals to proper handshaking signals, logic for decoding address that seem on the bus.

Handshaking signals are utilized to determine in which direction transfer has to take place whether to CPU or from CPU. It should determine whether it is a WRITE or READ operation. Interrupt signals also might be handled here.

Address decoder determine whether it is Memory mapped I/O and I/O mapped I/O from one of the bits. If the decoder find that an interface is referenced it sends signal to the suitable device.

Interfaces may be categorized according to the way I/O devices transfer data either in parallel or serial form.

 


Related Discussions:- Input output interface-microprocessor

Arithmrtic operation exercise assempley HELP!, Open notepad and enter the c...

Open notepad and enter the code for a program that calculates the following arithmetic expression: x = a + b + c - d - e + f The operands a, b, c, d, e, f, and x should be declared

Program that will compute and output tuition cost, Write an assembly progra...

Write an assembly program that will compute and output tuition cost: a. accept keyboard input of the number of credit hours taken b. accept keyboard input of the type of classes 1

L.A, How is bob different from johnny in the outsiders

How is bob different from johnny in the outsiders

Dec-arithmetic instruction-microprocessor, DEC:  Decrement :- The decremen...

DEC:  Decrement :- The decrement instruction subtracts 1 from the contents of the particular memory location or register. All the conditions code flags except carry flag are affec

Summation Program., Write a program to solve problem 9, Summation Program, ...

Write a program to solve problem 9, Summation Program, on page 179 of chapter 5 in the textbook (book:kip Irvine Assembly Language sixth edition)

Avr, how to code

how to code

Overview of intel pro-pentium, Overview of Intel Pro-Pentium : The 2 c...

Overview of Intel Pro-Pentium : The 2 chief players in the PC CPU market are Motorola and Intel.  Intel has enjoyed incredible success with its processors since the early 1980

Base convertor, take an integer and its base and the base in which you want...

take an integer and its base and the base in which you want to convert the number from user and perform conversion.

I want to make a calculator, 64-bit integer calculator, which processes usi...

64-bit integer calculator, which processes using 16-bits at a time (reg/mem16 operands)

Flow chart and pseudocode, #question.flow chart for a program to find out t...

#question.flow chart for a program to find out the number of even and odd numbers from a given series of 16-bit hexadecimal numbers.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd