Control circuit and control method for dual mainboards

Abstract

The invention provides a control circuit and a control method for dual mainboards. A phase inverter and a connector are arranged on a first mainboard and a second mainboard; and a signal is sent and read through a first pin and a second pin on the connector. The control method comprises the steps that a control button is pressed down; the first mainboard and the second mainboard read startup/shutdown state signals of own systems; the first mainboard executes a startup action when reading the shutdown state signal; the second mainboard executes the startup action when reading the shutdown state signal; the first mainboard reads a level signal of the first pin when reading the startup state signal, executes a shutdown action when reading a high-level signal, and does not execute the shutdown action when reading a low-level signal; and the second mainboard reads a level signal of the second pin when reading the startup state signal, executes the shutdown action when reading a high-level signal, and does not execute the shutdown action when reading a low-level signal.

Description

technical field [0001] The invention relates to a control circuit and a control method of a double main board, in particular to a circuit and a method for controlling a double main board by reserving a pin on a connector. Background technique [0002] The motherboard, also called the Main Board (MB for short), is installed in the chassis and is one of the most basic and important components of the computer. In practical applications, in order to meet the redundancy requirements, some computers or servers have dual motherboards. In the system, the dual mainboard includes the main mainboard (Master Mainboard) and the subordinate mainboard (Slave Mainboard). In order to control the switching of the main mainboard and the subordinate mainboard, a control button is provided on the front panel of the computer or server case, and its behavior mode is as follows : [0003] 1. If the main board and the slave board are both on, when the user presses the control button, both the main ...

AI Technical Summary

Problems solved by technology

[0005] Based on the above behavior pattern, when the user presses the control button, the main motherboard and the slave motherboard need to detect each other’s power on / off status first, and then make their own power on / off action judgments to meet the above behavior pattern. In the prior art, the main board and the slave board each need to provide a set of signals to determine the on / off status of the other party. Therefore, at least two pins must be reserved on the connector connecting the master board and the slave board, one of which is Send your own on / off status signal to the other party, and the other pin is used to read and detect the on / off status of the other party. If there is only one pin left for the connector and the space on the PCB is limited, no The conditions for replacing the connector with a large number of pins cannot satisfy the main board and the slave board to judge the on / off status of each other, which will lead to the failure to achieve the purpose of controlling the dual board

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