| 摘要 |
<p>A data recovery circuit for reading data stored in a plurality of sectors formed on a recording disk comprises a clock recovery circuit (410) that generates a plurality of clock signals and produces an output formatted data stream by passing an input formatted data stream read from the recording disk when a switch signal is asserted. The clock signals represent a recovered clock signal when the switch signal is asserted and represent a reference clock signal when the switch signal is deasserted. A format control circuit (412) asserts the switch signal when a sector pulse signal is detected, detects the formatted data stream, reads the data stored in the identification field of a sector and determines a current sector number, asserts the switch signal at the beginning of the data field of a sector and reads the data stored in the data field regardless of whether the current sector number is equal to a search sector number, ignores the data stored in the data field when the current sector number is unequal to the search sector number, generates a stream of unformatted data in response to the data stored in the data field when the current sector number is equal to the search sector number, and deasserts the switch signal for a predetermined time when an interrupt signal is asserted. A demarcation circuit (414) counts the plurality of clock signals each time a servo signal is detected, and generates the interrupt signal after a predetermined number of clock signals have been detected. <IMAGE></p> |
