Switching method and switching circuit based on serial port multiplexing of multiple processors on single board

Abstract

The invention provides a switching circuit based on multiplexing of multiple-processor serial ports on a single board. The switching circuit is arranged on the single board and comprises at least two processors, one selector switch, one electrical level shifter, a control circuit for serial port switching and a panel serial port socket, wherein the panel serial port socket is respectively connected with the electrical level shifter and the control circuit for serial port switching, the electrical level shifter is respectively connected with the first processor and the second processor through the selector switch, and a signal controlling pin of the serial port switching circuit is connected with the selector switch. The invention further provides a switching method based on multiplexing of the multiple-processor serial ports on the single board. Thus, the serial ports of the processors can share one panel serial port socket, through plugging-in and plugging-out, the panel serial port socket can be connected to different processor serial ports, and panel space of the single board is saved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a switching method and a switching circuit based on the multiplexing of multiple processor serial ports on a single board. Background technique [0002] Among the single boards of communication equipment used in telecommunications, the serial port interface is the most commonly used human-computer interaction interface. Although in the network device, the interaction with the device can be realized through the network port, but once the device network fails and online debugging is required to obtain debugging information, the serial port interface becomes an indispensable interface. The serial port interface is the bottom debugging interface of the embedded single board. After the general program is started, a series of debugging information will be printed out through the serial port interface. At the same time, the minimum system is also based on serial port communicatio...

AI Technical Summary

Problems solved by technology

An obvious disadvantage of this implementation is that if the processor fails during the operation of the device and cannot respond to the command to switch the serial port sent by the computer, the user will never be able to connect to other processors, so that the problem cannot be well located.

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