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C156-E142-02EN 1 - 9
The control circuit section is divided into two parts: an ATAPI controller section which deals
with control between the ATAPI interface and drive interface, and a drive circuit section which
controls the drive.
(1) ATAPI controller circuit section
The ATAPI controller circuit's reliability is improved by large-scale integrated circuit technology.
The high-speed microprocessor (MPU) handles ATAPI interface control and drive control such as
drive read-and-write control and single-beam control.
(2) Drive circuit section
The drive circuit section consists of the following circuits:
! Laser diode control circuit
! Signal reproduction circuit
! Servo/seek control circuit
! Rotation control circuit
! Drive miscellaneous control circuit
The DSP (digital signal processor) is used for the servo/seek control circuit to reduce the circuit
amount, therefore this circuit is a simple configuration.
The drive circuit section executes operations such as seek, erase, record, and playback while the
MPU controls the focus-tracking of the beam.