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

A design method and state machine technology, applied in the direction of electrical program control, sequence/logic controller program control, etc., can solve the problems of Godson main board influence, inflexibility, time-consuming, etc., and achieve stable startup and shutdown, and good usability Effect

Active Publication Date: 2011-05-18
中科泓泰电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0016] figure 1 Shown in is the schematic diagram of the state transition designed in the present invention. The power-on and power-on sequence of the Loongson motherboard is executed according to the operation of this state machine.

[0017] Idle: Indicates that the motherboard has just been plugged into the power plug, and this is only Standby power.

[0018] S0: Indicates the power-on state.

[0019] S5: Indicates the power-off state.

[0020] From figure 1 It can be seen in the figure that when the power button of the motherboard is not pressed, it is in the Idle state, and Slp_s5 is low level 0 at this time. Once the power-on button is pressed, the south bridge of the motherboard will send Slp_s5 as high level 1, and when the state machine detects that Slp_s5 has become 1, it will jump to the S0 state and start to execute the power-on sequence Logic, and once the power button is pressed for 4 seconds, the south bridge will send a signal that Slp_s5 is low, and then t...

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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 ...

Claims

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Application Information

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IPC IPC(8): G05B19/05
Inventor 王晖郑臣明柳胜杰王英郝志彬梁发清邵宗有刘新春方信我
Owner 中科泓泰电子有限公司
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