AT78C4050

Features:

• Integrates All Required Components for Complete ATAPI DVD/CD Writer Solution
Data Channel
Servo Control Processor
DVD ECC ENDEC
CD CIRC C3 ENDEC
Buffer Management
EFM EFM+ 1.7 PP ENDEC
ATAPI Interface
• Formats Supported
DVD-ROM
DVD-R
DVD-RW
DVD+R
DVD+RW
Blue Laser DVD
CD-ROM Mode 1
CD-ROM Mode 2
CD-ROM XA Mode 2 Form 1
CD-ROM XA Mode 2 Form 2
CD-DA
CD-R
CD-RW
• Read/Write Speeds Supported
DVD-ROM 16x
DVD+R 16x
DVD+RW 8x
DVD-R 16x
DVD-RW 8x
Blue Laser DVD 8x
CD-R 52x
CD-RW 48x
CD-ROM 52x
• Pick-up Head Interface
Auto Laser Power Control (ALPC) Circuit
Supports Alpha (ROPC) Loop and OPC
Programmable Serial Interface to OPU for Write Strategy Control
Supports OPU Current Type and Voltage Type
TWI interface to Access the EEPROM Serial Number
• Host Interface
ATAPI Compatible ATA-6 Host Mode
Ultra DMA Support (100 MB/s)
Direct Interface to ATAPI Bus
• Processor
ARM946E-S™ RISC Processor
Internal SRAM for Data
Parallel External 16-bit Width Flash for Code, 512 Kbyte (max)
• Error Correction
Real Time DVD ECC Encoder and Decoder for 32 Kbyte Block
Real Time DVD ECC Encoder and Decoder for Blue Laser DVD
DVD EDC Error Detection
Error Correction for Pre-pit, ATIP, ADIP, ID, Wobble Data for Blue Laser DVD
Real Time CD CIRC Encoder and Decoder
Real Time CD C3 ECC Encoder and Decoder
CD EDC Error Detection
CD Sub-code Error Correction
• Data Format
EFM and EFM+ Modulation and Demodulation
1.7 PP Modulation and Demodulation for Blue Laser DVD
Target ID Detection
Support DVD-R/RW 2K and 32K Linking Loss
Support CD-R/RW Link Sector Read
Support CD-R/RW Address Mode 1 and Mode 2
ATIP, ADIP, Pre-pit, Blue Laser DVD Wobble Information Decoder
• Buffer Manager
Supports SDRAM Up to 16 Mbytes (8M x 16)
Support Buffer Underrun Prevention
Support Variable Buffer Segmentation
Circular Buffer Control with Access Priority
Programmable Timing Control for SDRAM
• Servo
Servo Processing Unit Using ARM946E-S Maximum Processing Power with 200 MHz System Clock
Internal RAM for Code and Data (24 KB)
Digital Servo Adapted to Various OPU
Digital DPD for Tracking Error
1 and 3 Beams Push/Pull Tracking Detection
Digital Detector for Blank Detect, Media Recognition and Defect Detect
Wobble PLL, Pre-pit Detector, Frequency Demodulator, BPSK Demodulator and MSK STW Demodulator
• Read Channel
PRML Read Channel to Support High Speed Transfer Rates
RF Data Channel
• Wide Bandwidth Automatic Gain Control Analog Front-end
• Programmable 7th Order Continuous Filter
• 7-bit ADC for Sampling the PRML Read Signal
• 15 Tap Adaptive Digital FIR Equalizers
• Digital Viterbi Detector
Clock Recovery and Synthesizer Functions
• Wide Frequency Range of Clock Extraction
• Frequency Synthesizer with M/N Dividers
• Supporting CLV, CAV, PCAV and ZCLV
• Supports Write Clock Synthesis with a Low Jitter PLL
Integrated Servo Algebra and ALPC Functions
• Supports Sampled Signals for Differential Phase Detection (DPD), and Push/Pull Tracking Detection
• Wobble Detection of DVD+R and DVD+RW
• Pre-pit Detection of DVD-R/W
• ADIP/ATIP Detection
• ALPC Closed Loop Capability to Support OPC/ROPC
• Integrated Servo Pre-drivers for Focus, Track and Spindle Motor
• Integrated On-chip Calibrator to Remove Circuit Offsets
• Integrated Audio Drivers
• On-chip Sequencer to Internally Generate Control Signals for RF AGC, Timing Recovery, Calibration and Various Servo Algebra Loops


Description

The AT78C4050 is ATMEL's high-integration, high performance single chip solution for DVDROM, DVD-R/RW, DVD-+R/RW, CD-ROM, CD-R/RW and Blue Laser formats. It integrates all required components for a DVD and CD rewri-table drive as well as for a DVD recorder. The AT78C 4050 includes data channel, DVD ECC, CD CIRC C3, buffer management, DVD CD 1.7PP, EFM+, EFM Endec and ATAPI interface logic.

The AT78C4050 is programmed by an external flash, and needs an external SDRAM, and a power driver to create a complete DVD/CD rewritable solution. This chip can be connected to an MPEG Endec to build a DVD recorder for consumer electronics applications. DVD disk read and write speeds of up to 16x, CD-ROM disc reading and writing speeds of up to 54x, Blue Laser DVD speeds of up to 8x can be implemented.

The AT78C4050 supports various types of OPUs. Either a current output OPU or voltage output OPU can be connected to AT78C 4050. ALPC, ROPC and OPC manage operation of the laser diode driver IC and control the writing process. On-chip features and programming options improve performance in high-speed systems.

Digital Servo control provides flexibility that enables the AT78C4050 to support various PDIC output. The calibration control is implemented by firmware. The Servo processor implements the focus, track, tilt, seek and spindle control loop, which off loads the master processor burden. Push-pull tracking error, DPD tracking error and Astigmatic Focus error detection are available. The chip provides all CLV, CAV, ZCLV and PCAV spin modes.

The AT78C4050 offers buffer underrun prevention for all types of discs. The data buffer size is up to 16 Mbytes with circular buffer method. The SDRAM controller supports various SDRAM chips. AT78C4050 supports Audio buffer playback. The buffer management provides pre-reading and cache to increase the data throughput.

The ATAPI host interface is designed in compliance with the ATAPI specification, which supports UltraDMA 100 Mbyte/s transfer rate. This device AT78C4050 is fabricated in 0.13 µm CMOS technology.