What Is The Difference Between I/O Mapped I/O & Memory Mapped I/O ?

Question

What Is The Difference Between I/O Mapped I/O & Memory Mapped I/O ?

Answer 1

Memory mapped IO is one where the processor and the IO device share the same memory location(memory) while IO mapped IO is one where the processor and the IO device have different memory located to each other.



In memory mapped I/O the I/O devices are mapped(identify for communication) through memory address. The address of the port will stored in memory locations. In I/O mapped I/O devices are mapped using the the port address.



In memory mapped io we use locations of memory interfaced as an address to IO devices whereas in IO mapped IO we use 8-bit address to interface io.

In memory mapped io we can use all instructions for data flow whereas in io mapped io we can use only two instructions i.e IN and OUT.

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Answer 2

Memory Mapped Io

Answer 3

\io mapped device is whole address space is available

and the memory mapped io is less memory spacve is available due to portioning

Answer 4

Look it up online

Answer 5

memory mapped i/o is suitable for small system while i/o mapped i/o is suitable for large system.

Answer 6

the memory mapped i/o device address is 16 bit but i/o mapped i/o device address is 8 bits

Answer 7

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Answer 8

In memory mapped I/O, a chunk of the CPU's address space is reserved for accessing I/O devices. i.e. they share common address bus and cpu instructions .



In I/O mapped I/O, I/O devices are handled distinctly by the CPU and hence occupy a seperate chunk of addressess predetermined by the CPU for I/O.

Answer 9

With I/O Mapped I/O there is a second address space for the I/O devices.



With Memory Mapped I/O the address space is used for both memory and I/O devices.

Answer 10

Is this a homework question?



Memory mapped I/O is mapped into the same address space as program memory and/or user memory, and is accessed in the same way.



I/O mapped I/O (also known as port mapped I/O) uses a separate, dedicated address space and is accessed via a dedicated set of microprocessor instructions.



If you're using a microprocessor or microcontroller that doesn't support port mapped I/O, then you have to use memory mapped I/O.



Microprocessors that support port mapped I/O include Intel x86 and compatible processors, and also the Zilog Z80 and Intel 8080.



Microprocessors that DON'T support port mapped I/O (and hence require the use of memory mapped I/O) include the Motorola 6800 and the MOS Technology 6502.



The advantage of port mapped I/O is that it makes for neater code and requires fewer external components to implement I/O. However, it adds to the complexity and pin count of the microprocessor itself.

Answer 11

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What Is The Difference Between I/O Mapped I/O & Memory Mapped I/O ?