Design method for realizing power on and off and time sequence resetting of Loongson mainboard by utilizing state machine

Abstract

The invention provides a design method for power on and off of a Loongson mainboard, in particular relates to a design method for realizing power on and off and time sequence resetting of a Loongson mainboard by utilizing a state machine. The design method comprises the following steps of: A, initiating the mainboard into an Idle state; B, after the machine is started, sending a high level signalof Slp-s5=1 by a south bridge; C, after a programmable logic device receives the signal of Slp-s5=1, starting to run the state machine to enter an S0 state; D, sending a power supply control logic, aresetting logic of south and north bridges and a resetting logic of a Loongson CPU by the state machine; E, after the machine is started for 4s through long pressing, sending a low level signal of Slp-s5=0 by the south bridge; F, after the programmable logic device receives the signal of Slp-s5=0, enabling the state machine to enter an S5 state; and G, executing the power off state by the state machine, and returning to the Idle state after a 12V power supply is switched off. The method for controlling the power on and off and the time sequence resetting through the state machine by utilizingthe programmable logic device, which is provided by the invention, has excellent availability and can stably play the roles of starting up and shutting down.

Description

technical field [0001] The invention provides a design method for powering on and off a main board, in particular to a design method for realizing power on and off of a Loongson main board and a reset sequence by using a state machine. Background technique [0002] In the current process of designing the X86 motherboard, the method of controlling the power on and off and reset of the motherboard is mainly realized by adjusting the charge and discharge delay of the resistor and capacitor, but this method has a big disadvantage: it is not flexible; Especially when debugging the motherboard circuit at the beginning, it will be very time-consuming because of the need to select the parameters of the resistor and capacitor, and it may bring serious consequences to the circuit if the parameters are not selected properly. For the Godson motherboard In other words, because its processor architecture is based on MIPS, and the method of power on and off and reset is slightly different ...

AI Technical Summary

Problems solved by technology

[0002] In the current process of designing the X86 motherboard, the method of controlling the power on and off and reset of the motherboard is mainly realized by adjusting the charge and discharge delay of the resistor and capacitor, but this method has a big disadvantage: it is not flexible; Especially when debugging the motherboard circuit at the beginning, it will be very time-consuming because of the need to select the parameters of the resistor and capacitor, and it may bring serious consequences to the circuit if the parameters are not selected properly. For the Godson motherboard In other words, because its processor architecture is based on MIPS, and the method of power on and off and reset is slightly different from that of the traditional X86 architecture motherboard: mainly in the precise control of time, so if you choose capacitors and resistors to charge It will take a lot of time to debug by discharging, and if a parameter is not selected properly, the timing of power-on and reset may be destroyed, which may have a great impact on the Loongson motherboard

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