Difference between Memory Mapped and IO Mapped ?

Hi every body,

           I am new to this field. I want to know some clarification

           1. What is memory mapped ?
           2. What is IO mapped ?
           3. what is memory mapped IO ?
           4. what is IO mapped memory?

        I am looking for ur valuable commants...

Raja wrote:
> Hi every body,
> 
>            I am new to this field. I want to know some clarification

Clarification isn't something you "know".  You seek, obtain, need, or 
get clarification, not know it.

>            1. What is memory mapped ?

Having an address which is accessable through an instruction to read or 
write system RAM.

>            2. What is IO mapped ?

Having an I/O location assigned, accessable though an I/O instruction.

>            3. what is memory mapped IO ?

I/O registers that are accessed via normal memory instructions.  Some 
processors have no separate I/O instructions, so all I/O is memory mapped.

>            4. what is IO mapped memory?

Memory accessable by I/O instructions?  One example is an external FIFO 
that you write one byte at a time.  Another would be external EEPROM 
that are accessed serially and used in small systems.

What do I win?

-- 
Thad