please explain these bullets more In memory-mapped I/O devices and main memory share the same address space. ⚬Each I/O device has its own reserved block of memory. ⚬Memory-mapped I/O therefore looks just like a memory access from the point of view of the CPU. ⚬Thus, the same instructions to move data to and from both I/O and memory, greatly simplifying system design. In small systems the low-level details of the data transfers are offloaded to the I/O controllers built into the I/O devices.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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please explain these bullets more

  • In memory-mapped I/O devices and main memory share the same address space.

⚬Each I/O device has its own reserved block of memory.

⚬Memory-mapped I/O therefore looks just like a memory access from the point of view of the CPU.

⚬Thus, the same instructions to move data to and from both I/O and memory, greatly simplifying system design.

  • In small systems the low-level details of the data transfers are offloaded to the I/O controllers built into the I/O devices.
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