Last updated on June 13th, 2020 at 08:31 pm
Memory Mapped I/O and Isolated I/O are two methods of performing input-output operations between CPU and installed peripherals in the system. Memory mapped I/O uses the same address bus to connect both primary memory and memory of hardware devices. Thus the instruction to address a section or portion or segment of RAM can also be used to address a memory location of a hardware device.
On the other hand, isolated I/O uses separate instruction classes to access primary memory and device memory. In this case, I/O devices have separate address space either by separate I/O pin on CPU or by entire separate bus. As it separates general memory addresses with I/O devices, it is called isolated I/O.
Read More: What are memory mapped I/O and isolated I/O?
Differences Between Isolated I/O and Memory Mapped I/O:
Isolated I/O
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No.
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Memory Mapped I/O
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Isolated I/O uses separate memory space.
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01
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Memory mapped I/O uses memory from the main memory.
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Limited instructions can be used. Those are IN, OUT, INS, OUTS.
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02
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Any instruction which references to memory can be used.
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The addresses for Isolated I/O devices are called ports.
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03
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Memory mapped I/O devices are treated as memory locations on the memory map.
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IORC & IOWC signals expands the circuitry.
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04
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IORC & IOWC signals has no functions in this case which reduces the circuitry.
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Efficient I/O operations due to using separate bus
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05
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Inefficient I/O operations due to using single bus for data and addressing
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Comparatively larger in size
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06
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Smaller in size
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Uses complex internal logic
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07
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Common internal logic for memory and I/O devices
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Slower operations
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08
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Faster operations
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it was helpful…thanx..:)
welcome.
thanks bro
Welcome bro…
it is easy to understand thanx for this :
Welcome…
which one should we use while connecting 7 segment lcd.>?
I studied these in my 7th semester, 1.5 years back. I can't answer you. These are just my notes those I made at that time, hoping that someone else will help you.
Nice WoRk BrO 🙂
Thank you…
Thanks a lot….
Welcome…
this is crap… and specific instructions are listed
Please elaborate…
Would you please tell me what IORC & IOWC stand for?
IORC = Input Output Read Command
IOWC = Input Output Write Command
Oh Really Thanks a lot I really needed it a lot!
Welcome. Hoping that this will help you out…
THANKS SIR ,,,,,,,,,,, CAN U HELP ME MORE
Thanks very much Tanmay…
Thanks very much Tanmay…. 🙂
May try, what's the topic?
Welcome … 🙂
Welcome … 🙂
it really helps a lot!
thnks
Welcome, glad to see my notes helping others …
Thanx man.great notes
Welcome, I hope these help.
difference u writtrn is quite in the easy language ….i love it….plz add some more difference u know…..that may help us
Whenever I get spare time, I do try to post the notes I wrote and will keep trying.
Latest Notes are on OOP with C++
Thanks you its so helpful….
welcome …
ACTUALLY helpful thankzzzzzzzzzzzzzzz
Glad to know that … welcome
good 1
Nice to Know.
Did ny1 noticed points 1 and 3 ?? Repeated !!!
Thanks Parimay Sharma for noticing, I also didn't noticed, however, erased it.
wt is diff. b/w memory mapping and i/o mapping
I don't know.
Thanks for this really helped me
Welcome
well thankuh sooo much!!!! please can uh dictate some application regarding isolated I/O nd memory mapped??
Thanks, but sorry I can't. These are my student life notes. Not working on these now a days ..
Thanku
Welcome
good one
Thanks.
CLEAR nad pointed notes ….thanks a lot 🙂
Thanks bro you helped me a lot
Thank you too.
Thank you too.