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