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
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