Memory mapping concepts

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nirmala h

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What is difference between

*Memory mapped I/O
*I/O mapped I/O
*Memory mapped Memory
*I/O mapped Memory

Memory-mapped I/O uses the same address bus to address both memory and I/O devices.
I/O-mapped I/O uses the separate address bus to address memory and I/O devices.

First 2 concepts are clear but can anyone explain about other 2 concepts of mapping..


Thanks in Advance..
 

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