CL-CS3712 datasheet(2/26 Pages) CIRRUS

2 / 26 page

C ONFIDEN TIAL

DS588PP1 - rev 0.4 April 11, 2002

PRELIMINARY DRAFT

www.cirrus.com

Features (Cont.)

Overview (Cont.)

RF Amp

• Provides laser power control

• Gain control in digital domain

• Generates focus error and tracking signal

• Provides RF signal for the data channel

• Bypass for external RF amp applications

Data Channel

• Digital PLL provides flexible control of center

frequency to support improved access times

• Channel quality provided for parametric calibration

• Channel data rates up to 210 Mbits/sec.

• Flexible and error-tolerant channel sync mark

windowing

SCP (Servo Control Processor)

• Includes a servo control processor for focus, tracking,

sled, and spindle servo loops

• Significantly faster capture for focus and tracking

• Effective in a wide range of parameter variations

• Superior response to defects, shock, and vibration

• Supports both CLV (constant linear velocity) and CAV

(constant angular velocity) modes

ECC

• Real-time DVD ECC error correction

• Real-time CD-ROM layered ECC error correction with

programmable number of sets of P-word and Q-word

corrections per sector (up to 64 total)

• C1/C2 ECC and de-interleaving

• Real-time subcode error correction in CD-DA

(compact disc digital audio) mode

Decoder

• Supports hardware streaming operation

• DVD navigation support

• Supports ADB (audio data buffering)

• Automatic target sector header search

• Hardware sector header validity check

• Supports high-speed Intel®- and Motorola®-type

microcontrollers

• Supports nonmultiplexed and multiplexed address

and data buses

Host Interface

• True real-time hardware/software ATAPI compatibility

• Supports Ultra DMA: capable of synchronous DMA

data rates up to 33.3 Mbytes/sec.

• Supports ATA PIO modes 3 and 4 transfers without

IOCHRDY

Host Interface (cont.)

• Supports DMA modes 1 and 2

• Hardware implementation of:

- ATAPI packet command

- ATAPI reset command

High-Performance

• PIO/DMA ATAPI bus transfer rate:

- PIO modes 3 and 4, multiword DMA modes 1

and 2, and singleword DMA modes 1 and 2

• Data transfer rate:

- CD-ROM CLV –maximum 32

× data rate with

25% overspeed capture

- CD-ROM CAV – maximum 40

× OD data rate

- DVD-ROM CLV – maximum 6

× data rate with

33% overspeed capture

- DVD-ROM CAV – maximum 8

× OD data rate

- DVD+R CLV – max. 4x read

• Buffer bandwidth:

- 55 Mbytes per second with 16-bit DRAM

Buffer Manager

• Dual-port circular buffer control with access-priority

resolver

• Supports streaming operation

• Direct addressing of up to 4 Mbytes of DRAM

• Supports variable buffer segmentation

• Programmable timing control for SDRAM

• Host overrun control

• Supports 16-bit SDRAM

The CL-CS3712 servo control processor implements the

focus, tracking, sled, and spindle servo loops. An ADC is

provided to convert the focus and tracking error signal.

The outputs to the power drivers are linear DACs.

The CL-CS3712 supports real-time DVD ECC, CD-ROM

C1/C2, and layered ECC correction, which is

programmable for up to 64 P- and Q-word corrections per

sector. It also supports subcode R/W correction in CD-

DA (compact disc digital audio) mode.

The buffer manager controls the flow of data from the data

channel, through the ECC, and to either the host interface

or the serial audio channel. Data is stored and retrieved in

the external buffer memory using interleaved access

cycles. The buffer memory is implemented with SDRAM

devices. Up to 4 Mbytes of SDRAM can be directly

addressed by the CL-CS3712.

CL-CS3712 Datasheet(PDF) 2 Page - Cirrus Logic

CL-CS3712 Datasheet(HTML) 2 Page - Cirrus Logic

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