Method and device for generating a write clock of a constant angular velocity optical disk drive

An optical storage device operated under a constant angular velocity comprising:

• a reference clock generator for generating a reference clock;
• a counter for generating a count number by using a reference clock to count a first signal;
• a phase detector for generating an adjustment value by detecting a phase shift between a second signal and a frame synchronization signal;
• a controller for generating a rectification value according to the adjustment value and the count number;
• and
• a frequency divider for generating a reference write clock according to the rectification value and the reference clock to further tune the frame synchronization signal;
• wherein if the phase shift between the second signal and the frame synchronization signal is less than a predetermined value, the reference write clock is a write clock of the optical storage device.

A circuit for generating a write clock for controlling a writing sequence according to a reference clock, a wobble signal read from an optical disc, an ATIP synchronization signal and an ESFS signal in an optical storage device, the circuit comprising:

• a counter for counting the wobble signal according to the reference clock to obtain an average count number;
• a first phase detector for generating an adjustment value by comparing a phase difference between the ATIP synchronization signal and the ESFS signal;
• a controller for generating a rectification value according to the adjustment value and the count number;
• a PLL circuit for synchronizing the ATIP synchronization signal and the ESFS signal;
• and
• a first frequency divider connected to the controller and the PLL circuit for generating a write clock according to the rectification value from the controller and the reference clock if the phase difference between the ATIP synchronization signal and the ESFS signal is less than a predetermined value.