William Stallings Computer Organization and Architecture 7 th Edition. Chapter 7 Input/Output. Input/Output Problems. Wide variety of peripherals Delivering different amounts of data At different speeds In different formats All slower than CPU and RAM Need I/O modules.
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William Stallings Computer Organization and Architecture7th Edition
Memory mapped I/O
Devices and memory share an address space
I/O looks just like memory read/write
No special commands for I/O
Large selection of memory access commands available
Separate address spaces
Need I/O or memory select lines
Special commands for I/O
Typical DMA Module Diagram