Some points of differences between
isolated i/o and memory-Mapped i/o are
as follows:
|
sn
|
Isolated I/O
|
Memory-Mapped
I/O
|
|
1
|
i/o transfer is made through separate read and
write line.
|
Memory
transfer is made through separate read
and write lines.
|
|
2
|
The
I/O transfer read and write control lines are enabled during the i/o are
enabled during a memory transfer.
|
The
memory read and memory write control lines are enabled during a memory
transfer.
|
|
3
|
The
isolated i/o configuration the CPU has distinct input and output instructions
and each instruction is associated with the address of an interface register.
|
Computer
with memory mapped i/o can use memory type instructions to access i/o data.
|
|
4
|
The
isolated i/o method isolates memory and i/o address values are not affected by interface address assignment.
|
In
a memory mapped i/o organization theme are no specific input or output
instructions.
|
