The bus of the computer is divided into data bus DB (Data Bus), address bus AB (Address Bus) and control bus CB (Control Bus), also collectively called the system bus.
1. "Data bus DB" is used to transmit data information. The data bus is a bidirectional three-state bus, that is, it can transmit data from the CPU to other components such as memory or I/O interfaces, and can also transmit data from other components to the CPU.
2. "Address bus AB" is specially used to transmit addresses. Since addresses can only be transmitted from the CPU to external memory or I/O ports, the address bus is always unidirectional and tri-state. This is consistent with The data bus is different.
3. "Control bus CB" is used to transmit control signals and timing signals. Among the control signals, some are sent by the microprocessor to the memory and I/O interface circuits, such as read/write signals, chip select signals, interrupt response signals, etc.; some are fed back to the CPU by other components.
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