Abstract: A method and related circuit for clock generation and recovery utilizes digital components exclusively. The method is used to generate a wobble clock and an absolute time in pre-groove (ATIP) clock for controlling the operation of an optical disk drive. The circuit includes a counter and a digital logic circuit and utilizes clock triggering processes.

Abstract: A method for determining the position of an optic pick-up head and the device of the same are disclosed. The number of frames in certain section of the disk are used to determine the position of the optic pick-up head. The number of frames in inner section of the compact disk is smaller than that in the outer section. The disk is virtually divided into a plurality of sections, and number of frames within each section is defined. As a result, when the optic pick-up head is at a certain frame, the position of the optic pick-up head can be determined the number of frames in the section.

Abstract: A defect protecting circuit and a method for data slicer in an optical drive is disclosed. As a defect occurs in a disk, the gain of the data slicer is switched to a high gain. After the defect does not occur further, the gain is switched back to a normal gain. Therefore the slicing level can return back to a correct slicing level for reducing incorrect data after the defect terminates, and the jitter in the output data is also reduced.

Abstract: A method for controlling the burst cutting area (BCA) clock in reading BCA data and a circuit of the same functions to allow BCA data to be read correctly. A BCA clock extractor is used for reading the BCA data correctly. A proper clock modulation is performed through this BCA clock extractor so as to read BCA data correctly.

Abstract: A method for generating a write clock of a constant angular velocity compact storage device and the device thereof. The compact storage device has a counter for generating a count number by a reference clock counting a wobble signal, and a phase detector for generating an adjustment value by comparing a phase shift between an ATIP synchronization signal and an encoded subcode frame synchronization signal. According to the count number and the adjustment value, a rectification value is found, and the rectification value and the reference clock is used for generating a reference write clock to modify the encoded subcode frame synchronization signal. If the phase shift between an ATIP synchronization signal and an encoded subcode frame synchronization signal is smaller than a predetermined value, the reference write clock is the write clock used by the compact storage device.

Abstract: A reference clock generating circuit of a disk data burst cutting area is disclosed. Thereby, the BCA reference clock is generated by dividing the reference clock of a spindle control circuit for further capturing the BCA clock and the BCA data so that the BCA data and BCA clock are stably generated even if the rotary speed of the motor is changed.

Abstract: A method and related circuit for clock generation and recovery utilizes digital components exclusively. The method is used to generate a wobble clock and an absolute time in pre-groove (ATIP) clock for controlling the operation of an optical disk drive. The circuit includes a counter and a digital logic circuit and utilizes clock triggering processes.

Abstract: A defect protecting circuit and a method for data slicer in an optical drive is disclosed. As a defect occurs in a disk, the gain of the data slicer is switched to a high gain. After the defect does not occur further, the gain is switched back to a normal gain. Therefore the slicing level can return back to a correct slicing level for reducing incorrect data after the defect terminates, and the jitter in the output data is also reduced.

Abstract: A method for determining the position of an optic pick-up head and the device of the same are disclosed. The number of frames in certain section of the disk are used to determine the position of the optic pick-up head. The number of frames in inner section of the compact disk is smaller than that in the outer section. The disk is virtually divided into a plurality of sections, and number of frames within each section is defined. As a result, when the optic pick-up head is at a certain frame, the position of the optic pick-up head can be determined the number of frames in the section.

Abstract: A method for controlling the BCA clock in reading BCA data and a circuit of the same are disclosed. A BCA clock extractor is used for read the BCA data correctly. A proper clock modulation is performed through this BCA clock extractor so as to read BCA data correctly.