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What is the difference between memory interfacing and IO interfacing ?

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by the way i search about this at google but i couldn't find a right answer :S –  xpugur May 25 '10 at 20:22
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up vote 3 down vote accepted

There is a book entitled "Microprocessors" on Google books. In chapter 8, the book defines "Memory and I/O Interfacing". You can read the related pages from here.

Also, this article defines Memory Interfacing and I/O Interfacing. The following is an excerpt from the article:

Memory Interfacing:

While executing an instruction, there is a necessity for the microprocessor to access memory frequently for reading various instruction codes and data stored in the memory. The interfacing circuit aids in accessing the memory.

Memory requires some signals to read from and write to registers. Similarly the microprocessor transmits some signals for reading or writing a data.

But what is the purpose of interfacing circuit here?

The interfacing process involves matching the memory requirements with the microprocessor signals. The interfacing circuit therefore should be designed in such a way that it matches the memory signal requirements with the signals of the microprocessor. For example for carrying out a READ process, the microprocessor should initiate a read signal which the memory requires to read a data. In simple words, the primary function of a memory interfacing circuit is to aid the microprocessor in reading and writing a data to the given register of a memory chip.

I/O Interfacing:

We know that keyboard and Displays are used as communication channel with outside world. So it is necessary that we interface keyboard and displays with the microprocessor. This is called I/O interfacing. In this type of interfacing we use latches and buffers for interfacing the keyboards and displays with the microprocessor.

But the main disadvantage with this interfacing is that the microprocessor can perform only one function. It functions as an input device if it is connected to buffer and as an output device if it is connected to latch. Thus the capability is very limited in this type of interfacing.

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Thank you for your interest :) –  xpugur May 25 '10 at 20:51
    
You're welcome. –  Mehper C. Palavuzlar May 25 '10 at 20:53
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