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CL-CR3470/CR3475
Product Bulletin
FEATURES
General
— Single-chip integration of CD-ROM decoder,
CD-ROM encoder, CIRC encoder, EFM modulator,
ATIP decoder, buffer manager, and interface to SCSI
protocol ICs
— DVD port (CL-CR3475 only)
— Highly automated and high-performance CD-Record-
able formatter
— High-performance CD-ROM decoder
— Designed for easy and efficient firmware
programming
— High-performance built-in ATAPI interface
— Fully compatible with the ATAPI Specification
SFF-8020
— Automatic power-down interfaces when idle
— 144- and 176-pin LQFP packages available
— Built-in clock synthesizer
s CD-ROM Decoder
— Supports CD-ROM, CD-I, and CD-DA(CD-Digital
Audio) formats
— Supports various compact disc DSP (digital signal
processor) controllers
— Supports disc speeds up to 65-MHz MCLK
— CD speeds up to 40x
(cont.)
ATAPI CD-R/RW
Encoder/Decoder
OVERVIEW
The CL-CR3470 and CL-CR3475 are single-chip, high-
performance, highly integrated ATAPI interface devices
for the CD-R/RW (CD-Recordable/CD-Rewritable) mar-
ket. The CL-CR3470/CR3475 integrates CD-ROM
decoder, CIRC encoder, EFM modulation, ATIP
decoder, buffer manager, and ATAPI interface logic. In
addition to its CD-Rewritable capability, the CL-CR3475
features a DVD port enabling drive manufacturers to
develop a drive that reads DVD, CD-ROM, CD-R, and
CD-RW.
The CL-CR3470/CR3475 supports up to 40x read and
10x record disc speeds, allowing customers to preserve
all CD-R/E encode/decode electronics and firmware as
the disc speed requirements increase. All write
methods are supported by the CL-CR3470/CR3475
disc-at-once, track-at-once, packet recording, and
(cont.)
System and Functional
Block Diagram
LOCAL MICROCONTROLLER
ROM/RAM
ATAPI
BUS
MICROCONTROLLER
INTERFACE
ATAPI BUS
INTERFACE
CD-ROM
ENCODER
CD-RW
FORMATTER
ADB
BUFFER
MANAGER
CL-CR3470/CR3475
CD-ROM
DECODER
DVD
PORT
CIRC
ENCODER
EFM
MODULATOR
ATIP
DECODER
ECC
DSP
WRITE
STRATEGY
CD-RW
SERVO
CONTROLLER
DAC
BUFFER MEMORY
July 1998

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CL-CR3470/CR3475
ATAPI CD-R/RW Encoder/Decoder
FEATURES (cont.)
s CD-ROM Decoder (cont.)
— Supports programmable pseudo-sync-mark insertion for
CD-ROM sector synchronization
— Supports automatic target sector header search for
CD-ROM
— Supports CD-Text mode format
— Sector header validity check is done by hardware during
data transfer
— Realtime CD-ROM layered ECC error correction with
programmable number of P- and Q-word corrections per
sector (up to 64 total)
— Supports realtime subcode R-W correction in CD-DA
mode
— Automated CD-R packet disc read Method-1 and
Method-2
s ADB (Audio Data Buffer) and DAC Interface
— Supports CD-DA data buffering without slowing the
motor to 1x speed
— Supports streaming during disc-to-DAC data transfer
— Supports various DACs
s CD-R/RW Encoder
— Supports all write methods: disc-at-once, track-at-once,
packet recording, multi-session-at-once
— Fully compatible with Orange Book Version 2.9
specification
— Highly automated CD-R formatter eliminates the sector-
by-sector intervention by the microcontroller
— Supports CD-RW logical erase
— Supports up to 10x recording
— Supports subcode R-W encode
— Integrated CIRC encoder
— SPI (Serial Parallel Interface) controls an optional
external CD-R engine (CL-CR3475 only)
— Integrated EFM modulation circuitry
— Integrated ATIP decoder with target ATIP search
function
— Provides timing for laser power on/off control
s ATAPI Host Interface
— True realtime hardware/software ATAPI compatibility
— Hardware implementation of ATAPI packet command
ATAPI reset command
— Automated protocol control on block data transfer for
ATAPI read/write commands
— Supports Ultra ATA 33 data transfer protocol with data
rate up to 33.3 Mbytes/sec.
— Supports any host speed with programmable and auto
wait-state generation
— Supports fast ATA transfer speed up to PIO mode 4,
single-word DMA mode 2, and multi-word DMA mode 2
— Provision to daisy-chain two ATA or ATAPI embedded
drives
s Buffer Manager
— Supports 8-bit and 16-bit DRAM
— Dual-port circular buffer control with access-priority
resolver
— Direct addressing of up to 16 Mbytes of DRAM
— Supports variable buffer segmentation
— Supports streaming mode: hardware automation of con-
current host and disc transfers from different buffer
segments with a pacing mechanism to prevent buffer
overrun and underrun conditions
s Microcontroller Interface
— Supports high-speed Intel®- and Motorola®-type
microcontrollers
— Supports non-multiplexed and multiplexed address and
data buses
— Interrupt- or polled-microcontroller interface
— Supports Intel- and Motorola-type byte ordering for
word-wide microcontroller instructions
— Hardware wait states provided by the LREADY signal
with programmable or automatic wait state timing
— Supports direct microcontroller access to buffer memory
s SCSI Interface
— Supports data transfer to/from SCSI protocol devices,
such as Symbios Logic® 53CF94/96-2 and 53CF92A
Fast SCSI controllers
s Integrated DVD Port
— 8-bit parallel interface to optional DVD data decoder
(CL-CR3475 only)

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CL-CR3470/CR3475
ATAPI CD-R/RW Encoder/Decoder
OVERVIEW (cont.)
multi-session-at-once. These devices incorporate the
most comprehensive error correction available in the
industry, using realtime CD-ROM-layered ECC error
correction with a programmable number of P/Q-word
corrections per sector (up to 64 total). The
CL-CR3470/CR3475 also supports realtime subcode
R-W correction in CD-DA™ mode. Other hardware-
enabled features include automatic target-header
search, sector-header validity check during data
transfer, programmable pseudo-sync mark insertion
for sector synchronization, and automated CD-R
packet disc read (Method 1 and Method 2). The
CL-CR3470/CR3475’s DSP interface supports
CD-ROM DSPs from numerous manufacturers. The
DSP interface includes three types of interface signals:
main data channel signals, subcode channel signals,
and serial DSP programming signals.
The integrated formatter is a built-in control processor
that executes formatter instructions stored in the buffer
memory, controls the CD-ROM encoder, and specifies
how each block is generated/encoded through an
entire recording operation. The built-in high-perfor-
mance buffer manager controls the flow of data
between the external DRAM data buffer and all other
internal blocks.
These interfaces store and retrieve data to/from exter-
nal buffer memory using interleaved access.
In addition, the CL-CR3470/CR3475 supports stream-
ing mode and the hardware automation of concurrent
host and disc transfers from the same buffer segment.
These features ease firmware programming and
decrease microcontroller intervention.
The highly automated and optimized ATAPI interface is
designed for compliance with the ATAPI specification.
The ATAPI Command and Control Block registers are
contained in the CL-CR3470/CR3475 register set,
which allow both the host and local microcontroller
access. The CL-CR3470/CR3475 supports ATAPI
protocols by hardware without microcontroller
intervention.
The CL-CR3470 is available in a 144-pin LQFP pack-
age, and the CL-CR3475 is available in a 176-pin
LQFP package.
ADVANTAGES
Unique Features
Benefits
s Supports disc speeds up to 40x read and 10x write Ì Enables the highest-performance CD-R/RW drives
Ì Allows headroom for future speed requirements
without a complete system redesign
s Single-chip integration of CD-ROM
encoder/decoder, CIRC encoder, EFM modulator,
ATIP decoder, buffer manager, and host interface
logic
Ì Reduces cost, board space, chip count, and
interconnections
Ì Eases system design and firmware development
s Realtime ECC correction (up to 64 P/Q-word
corrections/sector) and Erasure Pointer correction,
with no microcontroller intervention
Ì Improves system performance, reduces firmware
overhead and microcontroller performance
requirements, and improves reliability and correction
capability
s Realtime subcode error R-W correction in CD-DA
mode
Ì Exceeds advanced ECC requirements of state-of-the-
art CD-ROM designs for a variety of
media/performance combinations
Ì Allows headroom for future ECC requirements
without a complete system redesign
s Unique DVD port (CL-CR3475 only)
Ì Enables CD-RW devices that also read DVD

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CL-CR3470/CR3475
Product Bulletin
Direct Sales Offices
Domestic
N. CALIFORNIA
Fremont
TEL: 510/623-8300
FAX: 510/252-6020
S. CALIFORNIA
Los Angeles
TEL: 310/820-6849
FAX: 310/820-6180
Westlake Village
TEL: 805/371-5860
FAX: 805/371-5861
NORTHWESTERN AREA
Portland, OR
TEL: 503/620-5547
FAX: 503/620-5665
SOUTH CENTRAL AREA
Austin, TX
TEL: 512/255-8893
FAX: 512/255-0733
NORTHEASTERN AREA
Andover, MA
TEL: 978/794-9992
FAX: 978/794-9998
Columbia, MD
TEL: 410/740-5654
FAX: 410/740-6961
SOUTHEASTERN AREA
Raleigh, NC
TEL: 919/859-5210
FAX: 919/859-5334
Boca Raton, FL
TEL: 561/395-1613
FAX: 561/395-1373
International
CHINA
Shenzhen
TEL: 86/755-3779637
FAX: 86/755-3779734
FRANCE
Paris
TEL: 33/1-48-12-2812
FAX: 33/1-48-12-2810
GERMANY
Herrsching
TEL: 49/81-52-92460
FAX: 49/81-52-924699
HONG KONG
Tsimshatsui
TEL: 852/2376-0801
FAX: 852/2375-1202
JAPAN
Tokyo
TEL: 81/3-3340-9111
FAX: 81/3-3340-9120
KOREA
Seoul
TEL: 82/2-565-8561
FAX: 82/2-565-8565
SINGAPORE
TEL: 65/743-4111
FAX: 65/742-4111
TAIWAN
Taipei
TEL: 886/2-2718-4533
FAX: 886/2-2718-4526
UNITED KINGDOM
London, England
TEL: 44/01628-472211
FAX: 44/01628-486114
High-Value Systems in Silicon
Cirrus Logic is a premier supplier of advanced integrated circuits that combine mixed-signal processing,
precision analog techniques, embedded processors, and application-specific algorithms into system-on-a-chip
solutions for existing and emerging growth markets. Enhanced by strong systems expertise in selected markets,
the company’s products add high value to major brands worldwide in magnetic and optical storage, networking
communications, consumer/professional audio, video, and imaging, and ultra-precision data acquisition.
Cirrus Logic’s manufacturing strategy ensures maximum product quality and availability, as well as access to
world-class processing technologies through joint ventures with IBM® and Lucent Technologies®.
Contact one of our systems and applications specialists to see how your company can benefit from the high value
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Copyright © 1998 Cirrus Logic, Inc. All rights reserved.
Cirrus Logic, Inc. has made best efforts to ensure that the information contained in this document is accurate and reliable. However, the information is
subject to change without notice. No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, nor for infringements of patents or other
rights of third parties. This document implies no license under patents, copyrights, or trade secrets. Cirrus Logic, and Crystal are trademarks of Cirrus
Logic, Inc., which may be registered in some jurisdictions. Other trademarks in this document belong to their respective companies. CRUS and Cirrus
Logic International, Ltd. are trade names of Cirrus Logic, Inc.
Cirrus Logic, Inc.
3100 West Warren Ave., Fremont, CA 94538
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