AT78C4050 datasheet, PDF - EEWORLD Datasheet

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AT78C4050: DescriptionDVD PRML Channel and System Controller SoC; File Size114KB，5 Pages; ManufacturerAtmel (Microchip)

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AT78C4050 Overview

DVD PRML Channel and System Controller SoC

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Features

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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

– DVD-R

16x

– DVD-RW

– Blue Laser DVD

– 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)

•

DVD PRML

Channel and

System

Controller SoC

AT78C4050

•

Summary

•

3507BS–NETST–6/05

Note: This is a summary document. A complete document

is available under NDA. For more information, please con-

tact your local Atmel sales office.

AT78C4050

• 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

•

1. Description

The AT78C4050 is ATMEL’s high-integration, high performance single chip solution for DVD-

ROM, 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 rewritable drive as well as for a DVD recorder. The

AT78C4050 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 AT78C4050. 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-read-

ing and cache to increase the data throughput.

The ATAPI host interface is designed in compliance with the ATAPI specification, which sup-

ports UltraDMA 100 Mbyte/s transfer rate. This device is fabricated in 0.13 µm CMOS

technology.

3507BS–NETST–6/05

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