Patent ID: 7550879
Filing Date: 2009-06-23
Classification: G11C

Abstract:
1. A computer system, comprising: a power switch, for switching the computer system on when the power switch is triggered; a reset switch, for resetting the computer system when the reset switch is triggered; an environment configuration memory, for storing an operational environment setting, the environment configuration memory having a power supply pin; and an erasing control circuit, connected to the power switch, the reset switch and the power supply pin, the erasing control circuit comprising: a first switch, having one end connected to a first output terminal of a power supply circuit and another end connected to the power supply pin, wherein a control terminal of the first switch is connected to a node, and the node is connected to a second output terminal of the power supply circuit; a second switch, having one end connected to the power supply pin, and another end connected to a first constant voltage, wherein a control terminal of the second switch is connected to the node; a third switch, having one end connected to the node, and another end connected to a second constant voltage, wherein a control terminal of the third switch is connected to the power switch; a fourth switch, having one end connected to the node, and another end connected to a third constant voltage, wherein a control terminal of the fourth switch is connected to the reset switch; and a voltage lifting circuit, connected to the control terminal of the third switch and the control terminal of the fourth switch, for turning on the third switch and the fourth switch as the power switch and the reset switch are not triggered, wherein the erasing control circuit connects the power supply pin to a ground voltage when the power switch and the reset switch are triggered simultaneously.