Last updated on June 13th, 2020 at 08:31 pm
Read More: What are memory mapped I/O and isolated I/O?
Differences Between Isolated I/O and Memory Mapped I/O:
Memory Mapped I/O
Isolated I/O uses separate memory space.
Memory mapped I/O uses memory from the main memory.
Limited instructions can be used. Those are IN, OUT, INS, OUTS.
Any instruction which references to memory can be used.
The addresses for Isolated I/O devices are called ports.
Memory mapped I/O devices are treated as memory locations on the memory map.
IORC & IOWC signals expands the circuitry.
IORC & IOWC signals has no functions in this case which reduces the circuitry.
Efficient I/O operations due to using separate bus
Inefficient I/O operations due to using single bus for data and addressing
Comparatively larger in size
Smaller in size
Uses complex internal logic
Common internal logic for memory and I/O devices