Definitionof memory addressing and types
Answers
Answer:
A memory address is a unique identifier used by a device or CPU for data tracking. ... Modern computers are addressed by bytes which are assigned to memory addresses – binary numbers assigned to a random access memory (RAM) cell that holds up to one byte
Answer:
MEMORY ADDRESS
Explanation:
DEFINITION
A memory address is a unique identifier used by a device or CPU for data tracking. This binary address is defined by an ordered and finite sequence allowing the CPU to track the location of each memory byte.
Modern computers are addressed by bytes which are assigned to memory addresses – binary numbers assigned to a random access memory (RAM) cell that holds up to one byte. Data greater than one byte is consecutively segmented into multiple bytes with a series of corresponding addresses.
Hardware devices and CPUs track stored data by accessing memory addresses via data buses.
Before CPU processing, data and programs must be stored in unique memory address locations.
Types of memory addresses
Physical addresses
A digital computer's main memory consists of many memory locations. Each memory location has a physical address which is a code. The CPU (or other device) can use the code to access the corresponding memory location. Generally only system software, i.e. the BIOS, operating systems, and some specialized utility programs (e.g., memory testers), address physical memory using machine code operands or processor registers, instructing the CPU to direct a hardware device, called the memory controller, to use the memory bus or system bus, or separate control, address and data busses, to execute the program's commands. The memory controllers' bus consists of a number of parallel lines, each represented by a binary digit (bit). The width of the bus, and thus the number of addressable storage units, and the number of bits in each unit, varies among computers.
Logical addresses
A computer program uses memory addresses to execute machine code, and to store and retrieve data. In early computers logical and physical addresses corresponded, but since the introduction of virtual memory most application programs do not have a knowledge of physical addresses. Rather, they address logical addresses, or virtual addresses, using the computer's memory management unit and operating system memory mapping