Patent ID: 7187634

Claim:
A control circuit for an optical record medium processing device mounted in a computer host, the computer host having a power supply capable of converting an alternating current to a direct current and outputting the direct current at both power-on and power-off statuses of the computer host, such that the optical record medium processing devicen operates at both power-on and power-off statuses of the computer host, the control circuit comprising: a command generator unit, distributing an operation signal regardless of whether the computer host is at a power-on or power-off status; a logic unit, coupled to the command generator unit through a system management bus to receive the operation signal and distribute a control signal in response to the operation signal; a power supply control chip, respectively coupled with the command generator unit and the logic unit to provide required power for a normal operation of the command generator unit and the logic unit at a power-off status of the computer host; wherein the optical record medium processing device automatically responds to the control signal and works correspondingly at both powered-on and power-off statuses of the computer host.