Technical features of the USB bus The full name of the USB is Universe Serial Bus, which is the universal serial bus. The upper circuit load is prone to make the bus voltage unstable due to its own leakage current. By using a pull-up resistor, the bus passes through a 5 kΩ power source, which can make the bus instantly in a stable high potential, thereby enhancing the anti-interference ability of the bus. It is a new PC serial communication protocol jointly formulated by Microsof, Compaq, and IBM in 1995. It not only greatly improves the transmission speed, but also has simple connection, true plug-and-play, transmission line power supply, Multiple devices can be connected in parallel, and the cost is low. (4) Improve the load balance of the bus and improve the reliability of the system. (5) Static RAM circuit [1] makes the current flow evenly through the circuit board, so that the peak value of the noise generated by the memory access moment becomes smaller. A complete USB bus system is divided into two parts: the USB bus host, the USB bus device, and the USB bus interconnection. 3 Anti-interference wiring measures (1) Input and output terminals use...
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