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This article mainly introduces the word length in the computer depends on what factors, the text is very detailed, has a certain reference value, interested friends must read!

The word length of a computer depends on the width of the "data bus." Computer word length refers to the number of binary digits for operation, which can be divided into 8, 16, 32, and 64 bits, mainly depending on the width of the data bus. The data bus is used to transfer data back and forth between CPU and RAM that needs to be processed or stored.

Operating environment of this tutorial: Windows 10 system, Dell G3 computer.

Computers use binary encoding to represent numbers, characters, instructions, and other control information. When a computer stores, transmits or operates, a group of binary codes as a unit is called a word, and the number of binary bits in a word is called a word length.

Usually called processing word length of 8-bit data CPU called 8-bit CPU, 32-bit CPU is at the same time processing word length of 32-bit binary data. Each 0 or 1 in binary is the smallest unit of binary, called a bit. Common word sizes are 8, 16, 32 and 64 bits. An 8-bit code is called a byte and is the basic unit of coding in computers.

Word length has a great relationship with the function and purpose of computer, and it is an important technical index of computer. Word length directly reflects the calculation accuracy of a computer. In order to adapt to different requirements and coordinate the relationship between calculation accuracy and hardware cost, most computers support variable word length operation, that is, half word length, full word length (or word length) and double word length operation can be realized in the computer. Other indicators are the same, the larger the word length, the faster the computer processing data. Early microcomputer word sizes were generally 8 and 16 bits, and most of the 386 and higher processors were 32 bits. Most of the computers on the market have 64-bit processors. The word length is determined by the number of data buses in the microprocessor's external data path.

Data Bus: Transfers data back and forth between CPU and RAM for processing or storage.

"Data bus DB" is used to transfer data information. The data bus is a bidirectional three-state bus, that is, it can transmit CPU data to other components such as memory or I/O interface, and can also transmit data from other components to the CPU. The number of bits of data bus is an important index of microcomputer, which is usually consistent with the word length of microprocessor. For example, Intel 8086 microprocessor word length is 16 bits, and its data bus width is also 16 bits. It should be pointed out that the meaning of data is broad, it can be real data, it can also be instruction code or status information, sometimes even a control information, so in practice, the data bus transmission is not necessarily only the real sense of data.

Common data buses are ISA, EISA, VESA, PCI, etc.

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