table of Contents
Physical address
1. Definitions
In the memory to byte units store information, or obtain the correct information to be stored, each byte memory cell given a unique address, called a physical address
Also known as the actual address or absolute address
2, parsing
Numbering starts at address 0, plus 1 each time sequentially, so the physical address space of the memory increases linearly
He is represented by a binary number, an unsigned integer, a writing format hexadecimal
In computer science, physical address, also called a real address, binary address
It is present on the address bus in electronic form , so that the data bus can access a particular memory cell of the main memory address of the memory
In the computer has virtual memory, the physical address of the virtual address used to distinguish multi-term
3. Calculation
In the real address mode, the address is a physical address by multiplying the segment offset address obtained by adding 16
Physical segment address address = offset * 16d +
Is the segment address will be defined in terms of memory segments for each section of the first paragraph address is the segment address
Logical address
1. Definitions
In computer architecture memory cell is seen from the perspective of the application, a storage unit, a network address of the host
It can be converted logical address into a physical address by the address translation or mapping function
Also known as a relative address
2, parsing
The address conversion function in the computer, the address (operand) instruction given access called logical addresses. After calculation or transformation of addressing only the physical address memory
The address of the user program is referred to as a logical address
The logical addresses constitute the address components of the two 16-bit segment address one of the other offset address. Unsigned two components are coded
Virtual address
Refers to a program produced by the segment selector and the segment offset address components of
Can be written in 段：偏移量the form of segment here is the segment selector
Linear address
1. Definitions
An intermediate layer between the logical address to the physical address conversion
2, parsing
In the segment address is part of the logical address of the segment offset, the linear address is the base address plus
Linear address is a 32-bit unsigned integer, usually expressed as a hexadecimal number
Program code will produce a logical address, a linear address can be generated by the logical address conversion. If paging is enabled, the linear address may be further transformed to produce through a physical address. If no paging mechanism, the linear address is the physical address