TW201122508A - Circuit for detecting status of managemnet engine - Google Patents

Abstract

A circuit for detecting statuses of a management engine includes a first electronic switch, a second electronic switch, and an indicating circuit. A first terminal of the first electronic switch is configured to receive a status signal of the management engine, a second terminal of the first electronic switch is connected to a first power supply through a first resistor, a third terminal of the first electronic switch is grounded. A first terminal of the second electronic switch is configured to receive a starting status signal, a second of the second electronic switch is connected to the first power supply, a third terminal of the second electronic switch is grounded. The indicating circuit includes a first input terminal and a second terminal, which are respectively connected to the second terminal of the first electronic switch and the second terminal of the second electronic switch. The indicating circuit is controlled by the first and second electronic switches to light.

Description

201122508 VI. Description of the Invention: [Technical Field] [0001] The present invention relates to a detection circuit, and more particularly to a management engine state detection circuit of a computer motherboard. [Prior Art] [0002] Many of the conventional computer motherboards support the management engine (Management.

Eng i ne, ME ) function. The Supervisor Engine is a technology for enabling or disabling various functions of a computer motherboard and configuring the power of a computer motherboard. 〇 [0003] The supervisor engine features are enabled (enabled) and di sabl ed (disabled). In fact, disabled does not really disable the management engine function, but suspends the management engine function in the initial stage of the computer boot, so that there is no signal about the management engine on any bus of the computer motherboard. When debugging the above computer motherboard, you need to disable the management engine function to avoid the influence of the management engine function on the test signal. [0004] In practical applications, testers generally only enter the management engine CJ face through a shortcut (such as pressing Ctrl+P on the keyboard) when the computer is turned on, in order to check whether the status of the management engine function of the computer motherboard is disabled. This process runs for a long time and affects the efficiency of the test. SUMMARY OF THE INVENTION [0005] In view of the above, it is necessary to provide a management engine state detection circuit that can display the state of the management engine of a computer motherboard. [0006] A management engine state detection circuit includes a first electronic switch, a second electronic switch, and an indicating circuit, the first end of the first electronic switch 098144147 Form No. A0101 Page 4 / Total 11 pages 0982075525 -0 201122508 receiving a management engine status signal from a south bridge of a computer motherboard, the second end of the first electronic switch is connected to a first standby power source through a first resistor, and the third end of the first electronic switch is grounded The first end of the second electronic switch is configured to receive a start state signal from a south bridge of the computer motherboard, and the second end of the second electronic switch is connected to the first, a backup power source, the second electronic device through a second resistor The third end of the switch is grounded, and the indicating electric circuit is provided with a first input end and a second input end respectively connected to the second end of the first electronic switch and the second end of the second electronic switch, the management engine The status signal and the start status signal are respectively used to control the first and second electronic switches to be turned on and off, and the first and the first electric switch are according to the tube. .;;: Engine State control signal and the activated state of the signal indicating light emitting circuit is enabled in the engine management computer motherboard. [0007] The management engine state detection circuit of the present invention detects the management engine status signal and the startup state through the first and second electronic switches, and controls the indication circuit to indicate whether the management engine state is in an axe enabled state, and is convenient to use. ... il I* " . 'H' " [Embodiment] [0008] Please refer to FIG. 1 'The preferred embodiment of the management engine state detection circuit of the present invention includes two N-channel MOSs (Metal-Oxide) -Semiconductor), the indicator circuit 10 includes a comparator U, an N-channel MOS transistor Q3, a light-emitting diode D, and a capacitor C 〇 [0009] The gate of the M0S transistor Q1 is connected to the management engine status pin SLP_M of the south bridge 2 of a computer motherboard, the drain of the m〇S transistor Q1 is connected to a first standby power supply through a resistor R1 3. 3V_SB The source of the MOS transistor Q1 is 098144147, the grass number A0101, the fifth page, the total number of n pages, 098, 00, 755, 755, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00 Pin SLP_S3, the 汲_ pole of the MOS transistor Q2 is connected to the resistor R2 The first standby power source is 3. 3V_SB, and the source of the MOS transistor Q2 is grounded. The inverting input terminal and the non-inverting input terminal of the comparator U are respectively connected to the dies of the two MOS transistors Q1 and Q2, and the comparator The output terminal of u is connected to the gate of the MOS transistor Q3, and the positive power terminal of the comparator 接 is connected to a second standby power source 5 V_SB 'the negative power terminal of the comparator U is grounded. The MOS transistor Q3 is not The pole is connected to the second backup power source 5V_SB through a resistor R3. The source of the MOS transistor Q3 is connected to the anode of the light-emitting diode and is grounded through the capacitor C. The cathode of the LED diode D is grounded.使用 [0010] When using the management engine state detection circuit of the present invention, the gates of the two MOS transistors Q1 and Q2 respectively receive the management engine status signal and the startup state signal from the south bridge 20, and control the indication circuit 10 The light emitting diode D is illuminated or extinguished to indicate whether the state of the management engine of the computer motherboard is in an enabled state or a disabled state. [0011] If the management engine of the computer motherboard is enabled, when the computer is powered on, The management engine of the South Bridge name The state pin SLP_M first changes from low level (3 is high level, after a period of time t, the system startup state pin SLP_S3 also changes from low level to high level, during this time period t the MOS transistor Q1 is turned on, the MOS transistor Q2 is turned off, at this time, the inverting input terminal of the comparator u is at a low level, the non-inverting input terminal of the comparator U is at a high level, and the comparator U outputs a high level, the MOS The transistor Q3 is turned on, so that the light-emitting diode D is positively illuminating, and the capacitor C starts to be charged. When the system startup state pin SLP_S3 also goes high, the MOS transistor Q3 is turned off, and the LED diode D is powered by the capacitor C to continue to emit light for a period of time and then extinguishes 098144147 Form No. A0101 Page 6 of 11 0982075525-0 201122508 [0012] ◎ [0014] [0015] 098144147 Off. When the computer motherboard enters the standby state from the normal power-on state, the management engine status pin 31^_^! continues to maintain a high level. The system startup state pin SLP_S3 changes from a high level to a low level. The diode D begins to glow again. If the management engine of the computer motherboard is disabled, when the computer is powered on, the management engine status pin SLP_M of the south bridge 20 is the same as the power-on sequence of the system startup status pin SLP_S3, and the two MOS transistors Q1, Q2 The bungee is simultaneously at a high level or a low level, the output of the comparator U is at a low level, the MOS transistor Q3 is turned off, and the illuminating diode D is always in an extinguished state. Even if the computer motherboard enters the standby state from the normal power-on state, the management engine status pin SLP_MM of the south bridge 20 is the same as the power-on sequence of the system startup state pin SLP_S3. The light-emitting diode D is always in the extinguished state. In other embodiments, the N-channel MOS transistors Q1, Q2, Q3 may also be other types of electronic switches. The light-emitting diode D can also be a la.... I «eight-like sounding element. The management engine state detection circuit of the present invention detects the management engine status signal and the startup status signal through the first and second electronic switches, and controls the LEDs in the indication circuit to be illuminated or extinguished to indicate whether the status of the management engine is out. It is easy to use when it is enabled. In summary, the invention conforms to the patent requirements of the invention, and the patent application is filed according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art in the spirit of the present invention are intended to be included in the following claims. Form No. A0101 Page 7 of 11 0982075525-0 201122508 BRIEF DESCRIPTION OF THE DRAWINGS [0016] FIG. 1 is a circuit diagram of a preferred embodiment of a supervisory state detection circuit of the present invention. [Description of main component symbols] [0017] MOS transistor: Q Bu Q2, Q3 [0018] Resistor: Rl, R2, R3

[0019] Light Emitting Diode: D

[0020] Comparator: U

[0021] Capacitance: C

[0022] South Bridge: 20 [0023] Indication Circuit: 1 0

[0024] The first backup power supply: 3. 3V_SB

[0025] Second backup power supply: 5V_SB

[0026] Management Engine Status Pin: SLP_M : 1 [0027] System Start Status Pin: SLP_S1 098144147 Form Number A0101 Page 8 of 11 0982075525-0

Claims (1)

201122508 VII, Shen 5 Qing patent scope: including a first electronic switch, a first A management engine state detecting circuit, an electronic switch and an indicating circuit, from a computer lucky earth 4*,, an electronic third end grounding 'the indicating circuit is provided with a first-input terminal and a first input terminal and respectively Connected to the second end of the first electronic switch and the second end of the first electronic switch, the management engine status signal and the activation state nickname are respectively used to control the first and second electronic switches to be turned on and off, the first And the second electronic switch controls the indication circuit to indicate whether the management engine of the computer motherboard is enabled according to the management engine status signal and the startup status signal. 2 . The winter management engine status detection circuit according to claim 1 The indicating circuit includes a comparator, a third electronic switch, a light emitting diode and a capacitor, wherein the inverting input end and the non-inverting input end of the comparator are respectively the first input end and the second input end of the indicating circuit The output end of the comparator is connected to the first end of the third electronic switch, and the second end of the third electronic switch is connected to a second standby power through a third resistor The third third terminal of the electronic switch to the anode of the light emitting diode and transmitted through the capacitor to ground, grounded cathode of the light emitting diode. 3. The management engine state detection circuit according to claim 2, wherein the first, second and third electronic switches are N-channel MOS transistors, 098144147 Form No. A0101 Page 9 of 11 Page 0982075525-0 201122508 The first, second and third ends of the first, second and third electronic switches are the gate, the drain and the source of the N-channel MOS transistor, respectively. 098144147 Form No. A0101 Page 10 / Total Page 〇 0982075525-0