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The computer word length depends on the width of the data bus. The number of binary bits in a word is called word length, which is determined by the total number of data lines (width) of the external data path of the microprocessor. Data bus is a bi-directional three-state bus, which is used to transfer data that needs to be processed or stored back and forth between CPU and RAM.

The operating environment of this tutorial: windows7 system, Dell G3 computer.

The computer word length depends on the width of the "data bus". The word length of a computer refers to the number of binary digits used to perform an operation, which can be divided into 8, 16, 32 and 64 bits, which mainly depends on the width of the data bus.

The computer uses binary coding to represent numbers, characters, instructions and other control information. When a computer is stored, transmitted, or operated, a set of binary codes as a unit is called a word, and the number of bits in a word is called a word length.

A CPU that handles 8-bit data is usually called an 8-bit CPU,32-bit CPU, which processes 32-bit binary data at the same time. Each 0 or 1 of the binary is the smallest unit that makes up the binary, called a bit. The commonly used word lengths are 8 bits, 16 bits, 32 bits, and 64 bits. A code with a word length of 8 bits is called a byte and is the basic coding unit in a computer.

The word length has a great relationship with the function and use of the computer, and it is an important technical index of the computer. Word length directly reflects the calculation accuracy of a computer. in order to meet different requirements and coordinate the relationship between operation accuracy and hardware cost, most computers support variable word length operation. that is, half-word-length, full-word-length (or single-word-length) and double word-length operations can be realized in the machine. Other indicators are the same, the larger the word length, the faster the computer can process the data. The word length of early microcomputers was generally 8-bit and 16-bit, while 386 and higher processors were mostly 32-bit. Most of the computers on the market have 64-bit processors. The word length is determined by the total number of data lines (width) of the external data path of the microprocessor. The width of data bus is an important index to determine the performance of computer. The data buses of microcomputers are mostly 32-bit or 64-bit.

Data bus (Data Bus): transfers data that needs to be processed or stored back and forth between CPU and RAM.

The data bus is a bi-directional three-state bus, that is, it can not only transfer the data of CPU to other components such as memory or Icano interface, but also transfer the data of other components to CPU. The number of bits of the data bus is an important index of the microcomputer, which is usually consistent with the word length of the microprocessor. For example, the word length of the Intel 8086 microprocessor is 16 bits, and its data bus width is also 16 bits. It should be pointed out that the meaning of data is in a broad sense, it can be real data, it can also be order code or status information, and sometimes even a control information, so in practical work, what is transmitted on the data bus is not necessarily just data in the real sense.

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