Details, datasheet, quote on part number: OTI-9790
CategoryMultimedia => Audio/Video => CD/DVD Applications
TitleCD/DVD Applications
DescriptionAtapi/usb 32x Read/8x Write Controller With Integrated Cd-DSP, CD Servo, Wobble Servo, And Write Strategy
CompanyOak Technology, Inc.
DatasheetDownload OTI-9790 datasheet
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Features, Applications

ATAPI/USB 32X READ/8X Write Controller with Integrated CD-DSP, CD Servo, Wobble Servo, and Write Strategy

Oak Technology's OTI-9790 provides the highest level of integration of any CD-R/RW controller of its kind, with 32X decoder and 8X ATAPI/USB 32X block decoder servo, dynamic write strategy, and audio DAC circuits that offer the best performance in the industry. 8X CD encoder 32X CD-DSP CD servo 12X wobble servo Dynamic write strategy Audio DAC VARIETY OF INTEGRATED CONTROLS The block decoder and CD encoder of the OTI-9790 are highly automated, greatly reducing the complexity and size of the firmware, as well as the required firmware storage and allowing the use of an inexpensive microcontroller. The OTI-9790 also allows the microcontroller direct access to DRAM, eliminating the need and cost of additional SRAM. The CD-DSP and CD servo of the OTI-9790 use advanced digital signal processing techniques to minimize the analog circuitry required. This approach provides greater immunity to system noise and offers increased flexibility. The advanced architecture results in reduced error rates, greater seek accuracy and improved seek access time, particularly for CD-R/RW media. The CD-DSP block of the OTI-9790 converts the analog RF data received from the pre-amplifier into digital data. The data is then EFM decoded and C1/C2 error corrected. The CD-DSP utilizes an advanced data slicing technique and digital asymmetry control loop, offering more programmability for frequency and gain. The digital PLL for data/clock offers fast response and recovery from defects. The CD servo block of the OTI-9790 is responsible for spindle motor speed control, optical pickup, focus, tracking and sled movement. All servo loops are digital with integrated ADC and DAC I/O. Digital filter, gain, and constant parameters are implemented with high precision. Advanced track counting enables a jump of an exact number of tracks to 2047, substantially reducing the seek time. Stable one-track re-seek ensures no buffer underflow and improves buffer effectiveness for host transfer and nX-to-1X playback. These and other advanced tracking and focus enhancements help keep drive head centered and focused on the track, resulting in a much faster seek time, particularly for CD-R/RW media. The wobble servo of the OTI-9790 supports speeds to 12X, allowing for much faster open session reading. The write strategy block offers a high degree of programmability, allowing many different implementations of CD-R and CD-RW strategies. The dynamic write strategy scheme implemented on the OTI-9790 allows for automatic fine adjustments for the write pulses, ensuring a much higher degree of interchange compatibility. encoder performance. In addition to a highly automated block decoder/encoder, the OTI-9790 integrates CD-DSP, CD servo, wobble

Highly automated Microcontroller direct access to DRAM Supports native PIO mode 4 Supports DMA mode 2 Supports UDMA -33 Supports SCSI passthrough mode Improved disk readability Lower C1/C2 error rate Improved eccentricity tolerance Improved focus Wobble tolerance Improved seek performance Highly accurate 2047 track short seek Programmable velocity table Fast long seek with center position servo Accurate one-track re-seek PAM sled control for stiction Advanced low power process Low power 0.35mm, 3.3V process 5V tolerant I/O ATAPI compliant I/O levels Enhanced power-down modes Single crystal operation 208-pin LQFP package

TECHNICAL SPECIFICATIONS ATAPI/USB Decoder Highly automated decoder Integrated USB interface Supports ATAPI (SFF-8020) standard Supports PIO mode 4 and multiword DMA mode 2 Supports to 32X decode Supports automatic target sector header search Supports Method 1 and 2 packet transfers Jitter-buffered sync Supports CD-DA data transfer Real-time P and Q error correction Supports to 16 MByte buffer memory Supports microcontroller direct access to buffer memory Supports SCSI controller DMA bus interface Enhanced power management CD Encoder Highly automated encoder Supports encode speeds 4X, 6X, and 8X Orange book 2 linking and writing pulse controls PLL controlled encoder clock Supports SubP, Q, R-W encode function Programmable SubQ writing sequence High-performance ATIP decoder CD Digital Signal Processor (CD-DSP) Supports disk speeds from 1X-to-32X Supports multiple CLV speeds from 1X-to-16X Supports continuous CAV operation from ID to OD Firmware controls CLV/CAV transitions Wide bit-clock capture range (50%) Jitter-free feature (+8/9 frames) C1 correction to 2 symbols C2 correction to 4 symbols DAC accepts 1X audio data during nX-to-1X CD operation Digital audio output with de-emphasis filter, digital attenuation, and anti-aliasing Second order DS 1-bit DAC Supports 2X playback for IEC-958 digital output

CD Digital Servo Fast and accurate 2047 track search with acceleration profile Accurate one-track re-seek Center position servo loop and track counter for long seeks Run-out compensation for reliable operation > 8000PRM PAM sled control for smooth movement during normal play Automatic focus offset, balance, and gain calibration Automatic tracking offset, balance, and gain calibration Shock detection Programmable defect detection Supports Hall sensor and back EFM spindle motor sensor RPM control based on spindle motor or data-rate feedback Firmware definable CAV/CLV profile Wobble Servo Supports encode speeds 4X, 6X, and 8X Write Strategy Dynamic write strategy allows automatic fine tuning of pulse widths in real time Support laser power modulation CD-R strategy Supports laser pulse-width modulation CD-R strategy Supports laser pulse-position modulation CD-RW strategy Timing resolution at 8X write speed Supports running OPC OTI-9790

Disc Motor SLED OPU Driver Sled Motor
ADC 12X-R Wobble Servo ATIP Demod Dynamic Write Strategy
DAC's PWM's Audio DAC Audio Out IEC-958 Out ATAPI UDMA USB/SCSI (passthrough)
Legend CD Audio CD-ROM CD-RW Peripheral Components

Copyright 2000 Oak Technology, Inc. All right reserved. Oak Technology and the Oak logo are registered trademarks of Oak Technology. All other brands, product names, and company names are trademarks or registered trademarks of their respective owners. The information in this document is believed to be reliable. However, Oak Technology, Inc. makes no guarantee or warranty concerning the accuracy of said information and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon it. Oak does not guarantee that the use of any information contained herein will not infringe upon patent, trademark, copyright, or rights of third parties. No patent or license is implied hereby. This document does not in any way extend the warranty on any product beyond that set forth in Oak's standard terms and conditions of sale. Oak Technology, Inc. reserves the right to make changes in the product or specifications, or both, presented in this publication at any time without notice.

Oak Technology, Inc., 139 Kifer Court Sunnyvale, 94086 / phone: 737-0888 / fax: 737-3838 /


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