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參數(shù)資料
| 型號： | CLC031AVEC |
| 廠商： | Motorola, Inc. |
| 英文描述： | SMPTE 292M/259M Digital Video Deserializer / Descrambler with Video and Ancillary Data FIFOs |
| 中文描述： | 的SMPTE 292M/259M數(shù)字視頻解串器/解擾器的視頻和輔助數(shù)據(jù)FIFO |
| 文件頁數(shù)： | 13/31頁 |
| 文件大?。?/td> | 399K |
| 代理商： | CLC031AVEC |
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Device Operation
(Continued)
Ancillary Data Functions
The CLC031A can recover
Ancillary Data
from the serial
data stream. This Ancillary Data and related control charac-
ters are defined in the relevant SMPTE standards and may
reside in the horizontal and vertical blanking intervals. The
data can consist of different types of message packets in-
cluding audio data. The serial Ancillary Data space must be
formatted according to SMPTE 291M.
The CLC031A sup-
ports Ancillary Data in the chrominance channel (C’r/
C’b) only for high-definition operation.
Ancillary Data for
standard definition follows the requirements of SMPTE
125M.
The
Ancillary Data FIFO
is sized to handle a maximum
length ANC data Type 1 or Type 2 packet without the ANC
Flag, 259 words. Defined in SMPTE 291M, the packet con-
sists of the Ancillary Data Flag, a 3-word Data ID and Data
Count, 255 8- or 10-bit User Data Words and a Checksum.
The design of the CLC031A
Ancillary Data FIFO
also allows
storage of up to 8 shorter length messages with total length
not exceeding 259 words including all ID information.
Ancil-
lary Data
is copied from the data stream into the
Ancillary
Data FIFO
. The parallel Ancillary Data will still be present in
the parallel chroma output
DV[9:0]
. ancillary flag information
is not extracted into the FIFO.
Copying of ANC data from the video data into the FIFO is
controlled by the
ANC Mask
and
ANC ID
bits in the control
registers. A system of flags,
ANC FIFO Empty
,
ANC FIFO
90% Full
,
ANC FIFO Full
and
ANC FIFO Overrun
are used
to monitor FIFO status. The details and functions of these
and other control words are explained later in this datasheet.
20020109
FIGURE 2. Control Data Read Timing (2 read and 1 write cycle shown)
20020110
FIGURE 3. Control Data Write Timing
C
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| CLC031 | SMPTE 292M/259M Digital Video Deserializer / Descrambler with Video and Ancilliary Data FIFOs |
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