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參數(shù)資料
| 型號： | CLC031VEC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SMPTE 292M/259M Digital Video Deserializer / Descrambler with Video and Ancilliary Data FIFOs |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | TQFP-64 |
| 文件頁數(shù)： | 13/31頁 |
| 文件大小： | 383K |
| 代理商： | CLC031VEC |
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Device Operation
(Continued)
Ancilliary Data Functions
The CLC031 can recover
Ancilliary Data
from the serial
data stream. This ancilliary 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 ancilliary data space must be
formatted according to SMPTE 291M.
The CLC031 sup-
ports ancilliary data in the chrominance channel (C’r/
C’b) only for high-definition operation.
Ancilliary data for
standard definition follows the requirements of SMPTE
125M.
The
Ancilliary 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 Ancilliary 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 CLC031
Ancilliary Data FIFO
also allows
storage of up to 8 shorter length messages with total length
not exceeding 259 words including all ID information.
Ancil-
liary Data
is copied from the data stream into the
Ancilliary
Data FIFO
. The parallel ancilliary data will still be present in
the parallel chroma output
DV[9:0]
. Ancilliary flag informa-
tion 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
www.national.com
13
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