Overview

The LC895299W and LC895299L are CD-ROM drive digital servo system ICs that integrate all signal processing functions after the RF head amplifier on a single chip.

Features

CD-DSP Block

• Supports full CAV operation at 48× speed

• Assures stable data readout by performing frame sync signal detection, protection, and interpolation.

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

• Applies a CRC check to the subcode Q signal and then outputs that signal via parallel I/O to the system microprocessor.

• Performs unscrambling and deinterleaving operations to rearrange the demodulated EFM signal in the stipulated order.

• Detects and corrects error signals and processes flags (C1: 2 errors, C2: 4 errors)

• References the C1 flags and the C2 error check result to set the C2 flags and interpolates or mutes the signal depending on the C2 flags.

• Provides two types of muting: zero-cross muting and soft muting.

• Independent left and right channel digital attenuators (8-bit resolution) Provides two types of attenuation: direct attenuation and soft attenuation.

• Bilingual support

• Built-in digital audio interface (supports both CLV and CAV)

• Built-in digital deemphasis

• Built-in 8× oversampling digital filters

• Built-in D/A converters

CD-ROM Decoder and ATAPI (IDE) Interface Block

• Built-in ATAPI (IDE) interface

• The user can freely set the CD main channel, C2 flag, and subcode areas in internal DRAM.

• Batch transfer function (Function for transferring the CD main channel, C2 flag, or subcode data in a single operation.)

• Multiple transfer function (Function for transferring multiple blocks automatically in a single operation.)

• CAV audio functions

• Intelligent functions (auto buffering, auto decoding, and CD-R functions)

• Subcode P to W buffering function (No ECC) and CD-TEXT support

• Supports Ultra DMA MODE2, MODE1, and MODE0

• Built in 1-Mbit DRAM

Functions

• Built-in digital servo and ATAPI (IDE) CD-ROM, CD-DSP, CAV audio, and1-Mbit DRAM functions