DVD Players
CD-R/RW
OPTICAL TECHNOLOGY
OTI-9790
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
encoder performance. In addition to a highly automated block decoder/encoder, the OTI-9790 integrates CD-DSP, CD servo, wobble
servo, dynamic write strategy, and audio DAC circuits that offer the best performance in the industry.
Highly integrated
CD-R/RW controller
ATAPI/USB 32X
block decoder
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 allow-
ing the use of an inexpensive microcontroller. The OTI-9790
also allows the microcontroller direct access to DRAM, elimi-
nating 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 asym-
metry 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 up to 2047, sub-
stantially 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 up to 12X,
allowing for much faster open session reading. The write
strategy block offers a high degree of programmability, allow-
ing 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.
Key Features
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
OTI_9790_v1 3/16/00 4:45 PM Page 1
Oak Technology, Inc., 139 Kifer Court Sunnyvale, CA 94086 / phone: (408) 737-0888 / fax: (408) 737-3838 / www.oaktech.com
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 up 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 up 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 of 1X, 2X, 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 up to 2 symbols
C2 correction up 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 at > 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 of 1X, 2X, 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 of 1/32T at 8X write speed
Supports running OPC
ADC
MPU
Flash
Data Buffer
Audio Out
IEC-958 Out
ATAPI-UDMA
USB
CD Audio
Legend
RF-amp
S/H
ATIP
Wrt DAC
APC DAC
Analog
Front End
Digital Servo
DAC's
PWM's
Driver
OPU
Sled
Motor
SLED
Disc
Motor
CD-DSP
Audio DAC
12X-R
Wobble
Servo
Dynamic
Write
Strategy
8X-W
Encoder
32X-R
Decoder
ATAPI
UDMA
USB/SCSI
(passthrough)
ATIP Demod
CD-ROM
CD-RW
Peripheral Components
OTI-9790
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.
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