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參數(shù)資料
| 型號(hào)： | CS3712 |
| 英文描述： | Integrated ATAPI DVD Drive Manager |
| 中文描述： | 集成的ATAPI DVD驅(qū)動(dòng)器管理器 |
| 文件頁數(shù)： | 6/26頁 |
| 文件大?。?/td> | 728K |
| 代理商： | CS3712 |
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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
2
Functional Decriptions
This section overviews the main functional blocks of the CL-CS3712 Integrated AVI/
ATAPI DVD Drive Manager, and is divided into the following sub-sections:
"Decoder" on page 2
"Data Channel" on page 4
"Servo Channel" on page 6
Decoder
The CL-CS3712 contains a highly automated DVD/CD decoder that takes EFM data from
the Analog Front and Digital PRML read channel and transform this data through a series
of operations into user data and sends it to the Host controller.
The sequence of operation is as follows:
The high level firmware sets up the decoder through the UP control interface. The
decoder is controlled through a register set. The high level FW sets up the mode of
operation (CD or DVD), the buffer manager and the host interface. The external SDRAM
buffer is controlled through a set of address pointers programmed by the FW. This
address pointers controls the data flow from the DISC, to and fro to the ECC Block and
the HOST.
DVD Mode
The actual data that is written on the DVD DISC is a transformed version of the user data
and follows the DVD Physical Specification.
To understand the decoder flow the transformation process needs to be understood,
which is beyond the scope of this document. In summary the user data is organized in
sectors (2048 bytes). The transformation process involves adding ID (Sector #) and other
information such as copy protection etc. to the data, Scrambling the data, ECC encoding,
splitting the data into recording frames , EFM modulation and creation of EFMP frames
with unique sync patterns inserted for EFMP frame identification.
The function of the decoder is to take this transformed data and convert back into the
user format.
Once the FW sets the start transfer control bit(s) in the decoder, the Decoder starts
processing the data from the Read Channel. The data is in the EFMP format (Eight to
Fourteen Modulation Plus) as defined in the DVD Physical Specification. The first step is
to synchronize and align the data on the EFMP frame boundaries by detecting unique
sync patterns that are embedded in the EFMP data stream. Once the data is aligned on
the EFMP frame boundary it is de-serialized into 16-bit symbols, and than demodulated
into 8 bits of data according to the EFMP modulation standard.
The next step is to determine the right starting point to start the transfer of data into the
buffer. The FW will program the Target Header or ID information. Once the incoming data
ID matches the programmed ID, data transfer to the Buffer starts. The data transfer
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