#The data bus of the cpu provides the flow of data signals.
Data bus technical indicators:
1. Bus bandwidth (bus data transmission rate) The bandwidth of the program bus bus refers to the amount of data transmitted on the bus per unit time, that is, Maximum steady-state data transfer rate of MB per clock. Two factors closely related to the bus are the bit width of the bus and the operating frequency of the bus. The relationship between them is:
Bandwidth of the bus = operating frequency of the bus * bit width of the bus/8
2. The bit width of the bus
The bit width of the bus refers to the number of binary data bits that the bus can transmit simultaneously, or the number of bits of the data bus, that is, the concept of bus width such as 32-bit, 64-bit, etc. . The wider the bit width of the bus, the greater the data transfer rate per second, and the wider the bandwidth of the bus.
3. Bus working frequency
The bus working clock frequency is in MHZ. The higher the working frequency, the faster the bus working speed and the wider the bus bandwidth.
Function of data bus:
The data bus is a bidirectional three-state bus, that is, it cantransmit CPU data to other components such as memory or I/O interfaces, as well as Data from other components can be transferred to the CPU.
The number of bits in the data bus is an important indicator of a microcomputer and 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 broad. It can be real data, instruction code or status information, and sometimes even control information. Therefore, in actual work, what is transmitted on the data bus is not necessarily just It is data in the true sense.
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