CL-CS3712 Ver la hoja de datos (PDF) - Cirrus Logic

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CL-CS3712

Integrated AVI/ATAPI DVD Drive Manager

Cirrus Logic 

PRELIMINARY DRAFT

Functional Decriptions

whereas in the case of CD-ROM data it is embedded in the main channel data. Once the

Target Header is found the data transfer to the Buffer starts and the de-scrambling is

done while storing the data in the buffer from the disc. This data is than transferred to the

Host (ATAPI or Audio DAC interface)

In the case of CD-ROM data, depending on the format additional C3 correction needs to

be performed. This flow is similar to the DVD case, i.e. when sufficient sectors are

available in the buffer, the ECC engine starts correcting the data and the Host transfer

starts as soon as sufficient sectors are available after C3 correction.

Data Channel

The CL-CS3712 contains a partial response maximum likelihood (PRML) read channel.

The channel takes the analog signals from the optical pickup's (OPU) photo detector

outputs, detects the EFM or EFM+ data, and sends the data to the decoder. Figure 1

illustrates the Data Channel architecture.

PD A

PD B

PD C

PD D

ATTENUATOR

AND

SUMMATION

OFFSET

CONTROL

OFFSET

CONTROL

VGA

DAC

LPF

+

RF ADC

DAC

OFFSET

CONTROL

GAIN

CONTROL

DIGITAL

EQUALIZER

ENVELOPE

DETECT

DEFECT

DETECT

RF TRACK

CROSSING

CHANNEL

QUALITY

SEQUENCE

DETECTOR

ITR

TO DECODER

Figure 1. Data Channel Diagram

DS588PP1 - rev 0.4 April 11, 2002

© Copyright 2002 Cirrus Logic Inc.

CONFIDENTIAL

www.cirrus.com

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