Memory-Mapped Input/Output

Have you ever wondered how your computer seamlessly interacts with external devices, such as storage drives, network interfaces, and peripherals? The answer lies in a clever memory-mapped I/O (Input/Output) technique. Unlike traditional I/O methods that involve separate address spaces for memory and I/O devices, memory-mapped I/O integrates device communication directly into the memory address space. A memory-mapped I/O device is a computer hardware component that uses a portion of the system’s memory address space and is accessible by load and store instructions, while address decoding determines which device or peripheral in a computer system should respond to a particular load or store instruction. This chapter will explore the fascinating world of memory-mapped I/O, uncovering its principles, benefits, and applications.