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參數(shù)資料
| 型號： | L64222 |
| 廠商： | LSI CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP208 |
| 封裝： | PLASTIC, QFP-208 |
| 文件頁數(shù)： | 31/32頁 |
| 文件大?。?/td> | 248K |
| 代理商： | L64222 |
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8
L64222 DVD Audio/Video Decoder
The read and write FIFOs are used to give the host access to the
external SDRAM. The read/write paths are still through registers. The
interface supports direct read/write, DMA transfers using an external
DMA controller, and block moves within SDRAM. The byte enable logic
converts host byte writes to 8-byte words for the write FIFO and 64-bit
internal bus and vice versa. The byte enable logic also switches byte
order for little endian hosts.
Channel Interface
The L64222 includes an independent parallel interface for direct
connection to DVD drives. The interface uses a simple handshaking
signal for bitstream transfers to buffer memory.
The L64222 channel interface handles the incoming data, which is
assumed to be an MPEG-2 compliant bitstream, and provides error
detection, reporting, CSS/CSS2 descrambling, and disc/title key
authentication. The channel interface detects data in the bitstream that
does not meet MPEG-2 or Dolby Digital syntax and can ag the data for
exception processing.
Hardware error handling includes error masking and the application of
concealment vectors in video. Audio error concealment includes muting
on errors and searching for error-free frames. The channel interface ags
gross errors in the bitstream that are due to channel buffer overrun or
underrun or to nonconformance in the bitstream. Error agging enables
the masking of errors in the display or in the audio output.
The L64222 channel interface also includes a fully integrated CSS/CSS2
module that provides disc/title key authentication and A/V descrambling.
The CSS/CSS2 module operates in one of ve modes: bypass, data key
extraction, A/V descramble, disc key authentication and extraction, or title
key authentication and decryption.
Memory Interface
The L64222 directly connects to commercial SDRAMs for use as frame
stores, channel buffers, and OSD memory. The L64222 uses frame
stores to store reconstructed pictures until they are displayed. It
constructs separate video and audio channel buffers to temporarily store
incoming audio, video, and header data. Some regions of memory can
be used for graphic overlay. This storage is combined into a single,
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