Isolated vs. Memory mapped I/O

Isolated vs. Memory mapped I/O

Isolated I/O

  •  Separate I/O read/write control lines in addition to memory read/write control lines
  •  Separate (isolated) memory and I/O address spaces
  •  Distinct input and output instructions

Memory-mapped I/O

  • A single set of read/write control lines (no distinction between memory and I/O transfer)
  • Memory and I/O addresses share the common address space
  • reduces memory address range available
  • No specific input or output instruction
  • The same memory reference instructions can be used for I/O transfers
  • Considerable flexibility in handling I/O operations

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