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Cosa (chi) è memory mapped - definizione
DATA STRUCTURE
Memory mapped
Memory map
In computer science, a memory map is a structure of data (which usually resides in memory itself) that indicates how memory is laid out. The term "memory map" can have different meanings in different contexts.
Memory-mapped I/O
I/O METHOD BETWEEN THE CPU AND PERIPHERALS WHICH USES THE SAME ADDRESS SPACE TO ADDRESS BOTH MEMORY AND I/O DEVICES; THE MEMORY AND REGISTERS OF THE I/O DEVICES ARE MAPPED TO ADDRESS VALUES
Port-mapped I/O; Memory-mapped IO; MMIO; I/O methods; I/O address; Memory mapped IO; Port IO; Port I/O; Memory mapped I/O; Port mapped I/O; Port mapped IO; PMIO; I/O Address; Io port; I/O port; IO address; IO port; Memory-mapped io; I/o port; I/O Port; IO Port; I/O ports; Incomplete decoding; Incomplete address decoding; Partial address decoding; Partial decoding; Memory-mapped I/O
Memory-mapped I/O (MMIO) and port-mapped I/O (PMIO) are two complementary methods of performing input/output (I/O) between the central processing unit (CPU) and peripheral devices in a computer. An alternative approach is using dedicated I/O processors, commonly known as channels on mainframe computers, which execute their own instructions.
memory mapped I/O
I/O METHOD BETWEEN THE CPU AND PERIPHERALS WHICH USES THE SAME ADDRESS SPACE TO ADDRESS BOTH MEMORY AND I/O DEVICES; THE MEMORY AND REGISTERS OF THE I/O DEVICES ARE MAPPED TO ADDRESS VALUES
Port-mapped I/O; Memory-mapped IO; MMIO; I/O methods; I/O address; Memory mapped IO; Port IO; Port I/O; Memory mapped I/O; Port mapped I/O; Port mapped IO; PMIO; I/O Address; Io port; I/O port; IO address; IO port; Memory-mapped io; I/o port; I/O Port; IO Port; I/O ports; Incomplete decoding; Incomplete address decoding; Partial address decoding; Partial decoding; Memory-mapped I/O
<architecture> 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.
(1997-04-14)
Wikipedia
Memory map
In computer science, a memory map is a structure of data (which usually resides in memory itself) that indicates how memory is laid out. The term "memory map" can have different meanings in different contexts.
- It is the fastest and most flexible cache organization that uses an associative memory. The associative memory stores both the address and content of the memory word.
- In the boot process, a memory map is passed on from the firmware in order to instruct an operating system kernel about memory layout. It contains the information regarding the size of total memory, any reserved regions and may also provide other details specific to the architecture.
- In virtual memory implementations and memory management units, a memory map refers to page tables or hardware registers, which store the mapping between a certain process's virtual memory layout and how that space relates to physical memory addresses.
- In native debugger programs, a memory map refers to the mapping between loaded executable(or)library files and memory regions. These memory maps are used to resolve memory addresses (such as function pointers) to actual symbols.
