Patent ID: 8198934
Filing Date: 2012-06-12
Classification: G06F

Abstract:
1. A circuit for detecting management engine (ME) state of a computer, the circuit comprising: a first electrical switch comprising first to third terminals, wherein the first terminal is connected to a south bridge of the computer to receive an ME state signal, the second terminal is connected to a first power supply via a first resistor, the third terminal is grounded; a second electrical switch comprising first to third terminals, wherein the first terminal is connected to the south bridge to receive a startup signal, the second terminal is connected to the first power supply via a second resistor, the third terminal is grounded; and an indicating circuit comprising first and second input terminals, wherein the first input terminal is connected to the second terminal of the first electrical switch, the second input terminal is connected to the second terminal of the second electrical switch; wherein the indicating circuit comprises a comparator, a third electrical switch, a light-emitting diode (LED), and a capacitor; an inverting and a non-inverting terminals of the comparator respectively function as the first and second input terminals of the indicating circuit, an output terminal of the comparator is connected to a first terminal of the third electrical switch, a second terminal of the third electrical switch is connected to a second power supply via a third resistor, a third terminal of the third electrical switch is connected to an anode of the LED and grounded via the capacitor, a cathode of the LED is grounded; and wherein the first and second electrical switches are operable to control the indicating circuit to indicate ME state of the computer according to the voltages of the ME state signal and the startup signal.