memory mapped I/O definition of memory mapped I/O in the Free Online Encyclopedia.

memory mapped I/O

A peripheral device that assigns specific memory locations to input and output. For example, in a memory mapped display, each pixel or text character derives its data from a specific memory byte or bytes. The instant this memory is updated by software, the screen is displaying the new data.

(architecture)

memory mapped I/O - The use of the same instructions and bus to communicate with both main memory and input/output devices. This is in contrast to processors that have a separate I/O bus and special instructions to access it.

The I/O devices are addressed at certain reserved address ranges on the main memory bus. These addresses cannot therefore be used for RAM. Motorola and Mostec architectures, among others, use memory mapped I/O.

Video cards and other cards with on-board memory might be accessed in this way though the term applies not just to devices containing memory but to any device connected to the memory bus. Accessing the devices usually consists of reading and writing certain built-in registers though sometimes the mere presence of a particular address can trigger the device.

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No references found	memory compression memory contention memory core memory cycle memory cycle time memory dump memory dump routine memory effect memory element memory expansion card memory farts memory fill memory footprint memory gap memory guard memory hierarchy memory interleaving memory leak memory location memory lockout register memory management Memory Management Unit memory manager memory map memory map list memory mapped I/O memory mapping memory module memory module configurations memory overlay memory port memory power memory print memory printout memory protect Memory Protection memory RAID memory register memory resident memory scrubbing memory search routine memory smash memory sniffer memory sniffing Memory Stick memory storage memory switch memory trace memory tube memory twist Memory Type Range Registers	Memory Load Memory Load Command Memory Loader Verifier Set Memory Loader/Verifier Memory location Memory location Memory location Memory location memory lockout register Memory Look-Up memory loss memory lymphocyte memory lymphocyte memory lymphocyte Memory Lymphocyte Immuno-Stimulation Assay Memory management Memory management Memory Management Control Operations Memory management hardware Memory Management System Memory Management Toolkit Memory management unit Memory management unit Memory management units Memory manager Memory manager Memory map Memory map memory map list Memory Mapped File memory mapped I/O Memory Mapped Input/Output Memory mapping Memory mapping Memory maps Memory maps Memory metal Memory Modeler Advanced Verification Memory module Memory module memory module configurations Memory on Hand Memory Order Machine Clear Memory Organization Packet Memory Overhead Reduction Ratio memory overlay memory picture Memory Placement Optimization memory port memory power memory print memory printout Memory Production Logging Tool memory protect Memory protection Memory Protection Unit Memory Protocol Translator Device memory RAID

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Memory Load
Memory Load Command
Memory Loader Verifier Set
Memory Loader/Verifier
Memory location
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memory mapped I/O

Memory Mapped Input/Output
Memory mapping
Memory mapping
Memory maps
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Memory metal
Memory Modeler Advanced Verification
Memory module
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Memory on Hand
Memory Order Machine Clear
Memory Organization Packet
Memory Overhead Reduction Ratio
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Memory Placement Optimization
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Memory Production Logging Tool
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Memory Protection Unit
Memory Protocol Translator Device
memory RAID