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C156-E097-01EN 1 - 9
(1) SCSI controller circuit section
The SCSI controller circuit's reliability is improved by large-scale integrated circuit technology.
The high-speed microprocessor (MPU) handles SCSI 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.