Optical disk apparatus utilizing exclusively allocated servo signal processing registers

The optical disk apparatus of claim 4 wherein the optical pickup further comprises:

• a focusing actuator;
• a tracking actuator;
• and
• a slide motor, the actuators and slide motor operative to position the photo-detector to read tracks of the optical disk.

An optical disk apparatus comprising:

• a motor for driving an optical disk;
• an optical pickup having a photo-detector, and having a focusing actuator, a tracking actuator and a slide motor operative to position the photo-detector;
• a matrix amplifier for generating a radio frequency signal and a servo error signal in response to an output signal from the photo-detector;
• an analog-to-digital converter for digitizing the servo error signal;
• a radio frequency signal processor for generating a binary data signal and a reproduced clock signal from the radio frequency signal;
• a decoder for demodulating the binary data signal and extracting address information of the optical disc from the binary data signal;
• a digital signal processor for executing processing of signals including the demodulated binary data signal and the digitized servo error signal;
• first and second registers within the digital signal processor, the first registers exclusively allocated to storage of data utilized in execution of servo error signal processing, the second registers allocated to storage of data utilized in execution of processing of signals other than the servo error signal, at least a portion of the data utilized in the execution of the servo error signal processing being stored only in the first registers;
• a timer for generating an interrupt signal provided to the digital signal processor, the digital signal processor executing servo error signal processing in response to the interrupt signal;
• a digital-to-analog converter for converting into analog drive signals digital drive signals generated by the digital signal processor in response to the processed servo error signal;
• and
• a driver for driving the focusing actuator, tracking actuator and slide motor in response to the analog drive signals.