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參數(shù)資料
| 型號： | CL-CS3712-33QC-A |
| 廠商： | CIRRUS LOGIC INC |
| 元件分類： | 光電元器件 |
| 英文描述： | Integrated AVI/ATAPI DVD Drive Manager |
| 中文描述： | CD MOTOR DRIVER, PQFP208 |
| 封裝： | 28 X 28 MM, 1.40 MM HEIGHT, MS-026BJB, LQFP-208 |
| 文件頁數(shù)： | 8/26頁 |
| 文件大?。?/td> | 728K |
| 代理商： | CL-CS3712-33QC-A |
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Functional Decriptions
DS588PP1 -
rev
0.4 April 11, 2002
Copyright
2002 Cirrus Logic Inc.
C
ONFIDENTIAL
P
RELIMINARY
D
RAFT
www.cirrus.com
4
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.
Figure 1. Data Channel Diagram
LPF
RF ADC
EQUALIZER
DIGITAL
VGA
GAIN
OFFSET
DEFECT
RF TRACK
CHANNEL
DAC
SEQUENCE
DETECTOR
CONTROL
CONTROL
DETECT
CROSSING
QUALITY
PD A
PD B
PD C
PD D
ATTENUATOR
AND
ENVELOPE
DETECT
+
DAC
OFFSET
CONTROL
OFFSET
CONTROL
SUMMATION
ITR
TO DECODER
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