JPS6425358A - Phase pull-in control circuit - Google Patents

Abstract

PURPOSE:To prevent the re-generation of an error and to shorten an access time by remaining a pull-in timing as information data on a recording medium while it is updated by the pull-in timing successful in the reading. CONSTITUTION:The circuit is composed of a register circuit 1, a phase locked loop oscillator control circuit 2, a system control circuit 3, a read write circuit 8 and a memory medium 9. The phase locked loop oscillator control circuit 2 generates a phase locked loop oscillator control timing by the medium defect information sent from the system control circuit 3, sends it to a read write control circuit 8, a pull-in error occurs newly, then, the medium defect information is updated, sent to the system control circuit 3 and written to the register circuit 1. When the medium defect information is updated and the action of the disk device is stopped, the contents of the register circuit 1 are written into one area. Thus, the re-generation of the pull-in error can be prevented and the access time can be shortened.