Overview

The LC895297 is a single-chip CD-ROM decoder and CD-DSP system that supports full CAV 20× operation and includes a built-in ATA-PI (IDE) interface.

Features

[CD-ROM Decoder and ATA-PI (IDE) Interface Blocks]

• Full CAV 20× operation

• ATA-PI (IDE) interface

• Supports the use of EDO DRAM.

• Supports the use of up to 4 Mbits of buffer RAM.

• The user can set up arbitrary CD main channel and C2 flag areas in buffer RAM.

• Batch transfer function (function that automatically transfers the CD main channel and C2 flag data in a single operation.)

• Multi-block transfer function (function that automatically transfers multiple blocks in a single operation.)

• DVD ECC interface

• Intelligent functions

[CD-DSP Block]

• The IC inputs a high-frequency signal, slices that signal at the correct level, converts that result to an EFM coded signal, and compares the phase with that of the built-in VCO.

• Uses an external 16.9344-MHz crystal element to generate a standard clock and to correctly generate the required internal timings.

• Performs frame synchronization, signal detection, protection, and insertion, and assures stable data readout.

• Demodulates the EFM coded signal to produce 8-bit symbol data.

• After applying a CRC check to the subcode Q signal, outputs that signal to a microprocessor over a parallel I/O channel.

• Performs unscrambling and de-interleaving to reorder the demodulated EFM signal in the prescribed manner.

• Performs error code detection and correction, and flag processing. (C1: dual errors, C2: four errors)

• Sets the C2 flags based on the C1 flags and a C2 check, and performs interpolation or muting depending on the C2 flags. Adopts a 2-point interpolation circuit, and converges the signal to the muting level if the C2 flags indicate over 2 consecutive uncorrectable errors.

• Accepts the input of commands from a control microprocessor over an 8-bit parallel interface. Supports track jump, disc motor start/stop, muting on/off, and track counting commands.

• Can perform arbitrary track counts.

• Includes CAV audio functions.

• Adopts zero-cross muting.

• Includes 8× oversampling digital filters.

• D/A converter with PWM output.

• Includes independent left and right channel digital attenuators.

• Provides digital deemphasis.

• Supports bilingual functions.