Explain the difference between memory-mapped I/O and instruction-based I/O.
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2. Explain the difference between memory-mapped I/O and instruction-based I/O.
Memory mapped I/O
the Basic I/O devices are treated as memory.
Allotted address size is 16-bit (A0 – A15)
the Data transfer instructions Same for memory and I/O devices.
Cycles involved Memory read and memory write
Interfacing of I/O ports Large (around 64K)
there is No separate control signal is needed for I/O devices.
Efficiency is Less
More decoder hardware required.
During memory read or memory write operations, IO/M’ is kept low.
Data movement Between registers and ports.
Logical approach are Simple
Usability In small systems where memory requirement is less.
Speed of operation Slow
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